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Linking with BGL adjacency_list_io.hpp
by Solomon Gibbs 05 Aug '03

05 Aug '03

Hi, I'm having trouble linking code that uses adjacency_list_io.hpp. If the header is included is included in more than one compilation unit, I get "multiple definition of function" errors for the non-template functions in adjacency_list_io.hpp: std::istream& operator >> ( std::istream& in, no_property& ) and void getSubset( no_property& p, const no_property& s ) I'm sure that there is some C+ subtlety that I'm missing here, but I'm not familiar enough with the library to understand what it is. Shouldn't non-template function code be in a .cpp file to keep this sort of thing from happening? - Solomon

3 5

degree_size_type vs integer
by Jérémie Leguay 05 Aug '03

05 Aug '03

Hi! I have a simple question: if I use the in_degree function I have in return a degree_size_type. How it is possible to convert it in integer? /Jérémie ___________________________________________________________ Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en français ! Yahoo! Mail : http://fr.mail.yahoo.com

2 1

shared_ptr Intellisense
by destinati2001 05 Aug '03

05 Aug '03

Hello, Has anyone been able to get IntelliSense member information for the boost::shared_ptr class? I am using Visual Studio.NET 2003. I have setup the boost directory as a subfolder of my project directory. Moreover, I *am* able to obtain Intellisense information for boost::any, any_cast, get_pointer, make_permuation_iterator, permutation_iterator_generator, permutation_iterator_policies, scoped_ptr, signal, and swap. The fact that scoped_ptr works fine makes me wonder why shared_ptr doesn't work. Any help would be much appreciated! Thanks, Jeff

1 0

boost::tokenizer
by peter 05 Aug '03

05 Aug '03

hi there im trying to tokenize a string where any sort of blank space (' ', or '\t') is a delimiter, and allow having spaces in a token by enclosing it with a single quote (') character... the code below does not work well if i have more than one space characters (' ' or '\t') beside eachother... it simply keeps the token (even though the result is an empty string)... #include <string> #include <vector> #include <boost/tokenizer.hpp> std::vector<std::string> tokenizeStr(const std::string &str) { std::vector<std::string> result; boost::escaped_list_separator<char> sep("", " \t", "'"); boost::tokenizer<boost::escaped_list_separator<char> > tok(str, sep); for(boost::tokenizer<boost::escaped_list_separator<char> >::iterator p=tok.begin(); p!=tok.end(); p++) { result.push_back(static_cast<std::string>(*p)); } return result; } does anyone have any ideas how to make this work without actually going through the list manually and deleting the empty tokens?? by the way, im using boost 1.29 thanks peter

1 1

New Bee Question
by sarwanaggarwal 03 Aug '03

03 Aug '03

Hi: 1. I finally built "lib" for file-system. 2. I copied borland's debug version to a project directory. 3. I am getting a link error from [Linker Fatal Error] Fatal: Expected a file name: Borlannd C++ Builder Version 6.0. 4. I get numerous errors from MSVC++. With little help, I am sure to get started soon. Thanks. Sarwan

1 0

schizophrenic code.
by chris_baus 01 Aug '03

01 Aug '03

Am I only one that is uncomfortable with the following: std::vector<boost::any> mySchizophrenicCollection; Just curious.

1 1

schizophrenic code.
by chris_baus 01 Aug '03

01 Aug '03

The following seems like a battle of wills between two different typing paradigms. std::vector<boost::any> m_schizophrenicCollection; The thought of this is making me a bit uneasy. comments? ~christopher

2 2

Re: [Spirit-general] Problem with Parsing
by Joel de Guzman 01 Aug '03

01 Aug '03

Hi, Have you tried using the Spirit debugger? Cheers, -- Joel de Guzman joel at boost-consulting.com http://www.boost-consulting.com http://spirit.sf.net Surinder Pal Singh <sps22(a)yahoo.com> wrote: > Hi, > I am trying to use Spirit (in the latest Boost 1_30_0) > for a project. I want to parse a file whose structure > is the following: > > section1 { > something; > } > > I am using the file_iterator to iterate on the input > file and then define comment as well as the grammar. I > am at my wits end why my parser keeps failing. (When > this simple grammar works, I want to make the parser > more complex.) My code is attached below. (Note: I > used the example in the distribution c_grammar.cpp as > the starting point for it.) > > Thanks. > > -surinder > I have attempted to join the spirit mail list, but > have not received the confirmation so far, but please > feel free to respond to me at: sps22_at_yahoo_dot_com > > > PS: This input file structure is going to be, of > course, more complicated than the example shown above. > Inside the setions, I would like to pass on flags and > statements to the code. If it is better for me to use > another approach to parse this file structure, please > suggest me. > [snip]

3 4

A Quick Question about Threads
by Paul Grenyer 01 Aug '03

01 Aug '03

Hi All I'm planning on replacing all our (Win32 API Wrapped) threads with the boost threads. I was looking at the thread class interface and there isn't a method to ask if the thread is still running. This is something we use quite a lot in out current wrapper. To get around this I was thinking of using a member variable in the function object that is passed to the thread constructor to indicated whether the thread had finished. Is there a better way? I've not had a really good look at the docs yet, but there doesn't appear to be a Critical Section class. Should I be using the Mutex for synchronisation instead? -- Regards Paul Paul Grenyer Email: pjgrenyer(a)iee.org Web: www.paulgrenyer.co.uk EvaneScence: http://www.evanescence.com

6 15

Graph Library: Ordered Vertex List?
by dmatt001 01 Aug '03

01 Aug '03

Hi Guys, I would like to use an ordered vertex list (ie based on property type) in an implementation that I am working on such that duplication can be avoided. I have read and understand how to implement an ordered edge list thanks to the previous posts but am finding it hard to get started! Perhaps I have missed the key example? It appears that from the way config::VertList is constructed that it may be a similar process in nature? adj_list_impl::add_vertex appears to discard the boolean return value from the associative insertion. Would such a construction allow me to avoid the duplication I seek to avoid? I am guessing so, but some advice would give me a confidence "boost". ( <-- It's a lame pun: I really do need help ;-) ) My first steps are below rehashing the excellent ordered edges example with a simple search/replace and maching my target container base. I'll keep plugging along with it anyway and it may just compile one day. Suggestions/Ideas/Refs/Ptrs are appreciated. Matt --- first guess follows --- template <class VertDesc> struct order_by_name : public std::binary_function<VertDesc,VertDesc,bool> { bool operator()(const VertDesc& v1, const VertDesc& v2) const { // Order by vertex name. return boost::get(boost::vertex_name, v1) < boost::get(boost::vertex_name, v2); } }; #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION struct ordered_set_by_nameS { }; namespace boost { template <class ValueType> struct container_gen<ordered_set_by_nameS, ValueType> { typedef std::set<ValueType, order_by_name<ValueType> > type; }; } #else struct ordered_set_by_nameS { template <class T> struct bind_ { typedef std::multiset<T, order_by_name<T> > type; }; }; namespace boost { template <> struct container_selector<ordered_set_by_nameS> { typedef ordered_set_by_nameS type; }; } #endif

3 3

Compile time Problem with boost::type_traits library
by Amit Bhatia 01 Aug '03

01 Aug '03

Hello, I am trying to use the boost::function library which in turn includes many of the headers from other boost libraries. I am using g++ 3.2 with: g++ -c -g -fwritable-strings -Wno-deprecated -static -ansi -pedantic -DANSI_HEADERS -D_G_HAVE_BOOL as the options. The file is_integral.hpp and the file is_convertible.hpp in the type_traits library contain the declarations of the type long long which the ISO C++ seemingly doesn't accept. The compiler gives the warning: ISO C++ does not support `long long' . I don't think there is a new version of this on boost. I downloaded the boost lib sometime in June Version 1.30.0. Can this problem be because of any of the compiler options that I am using? thanking you, regards, amit.

3 2

Spirit Sequential-or
by Bruno Martínez 01 Aug '03

01 Aug '03

Hi boosters, In operators.html (a || b) is said to be equivalent to (a | b | a >> b), but, if I understand precedence correctly, it should be equivalent to (a >> b | a | b). I'm just learning Spirit, so this may probably be my mistake, right? Cheers, Bruno Martinez ---------------------------------------------------- ATENCION Su servicio de correo tiene antivirus ?? @internet URUGUAY: http://www.internet.com.uy

3 3

FC++ in Boost, Spirit, Preprocessing
by Jan Kybic 31 Jul '03

31 Jul '03

Hello, I want to write in favor of Boostifying the functional library FC++, which I find very useful. Would a merger with the Phoenix library from Spirit (already in Boost) be feasible? Phoenix seems to have a slightly nicer syntax but lacks (as far as I know) the Haskell prelude functions and lazy list implementation, also the closures do not seem very intuitive to me. My main concern with both FC++ and Phoenix is that when defining new functiods, the user needs to write a lot of often repetitive code. This could be simplified using a suitable preprocessor. Would that be acceptable and are there other people interested ? Yours, Jan -- ------------------------------------------------------------------------- Jan Kybic <kybic(a)ieee.org> tel. +420 2 2435 7264 or <kybic(a)fel.cvut.cz>, http://cmp.felk.cvut.cz/~kybic

3 3

date_parsing.hpp.patch
by Tonal 31 Jul '03

31 Jul '03

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1 0

Spirit Parsing Problem
by sps22 31 Jul '03

31 Jul '03

Hi, I am trying to use Spirit (in the latest Boost 1_30_0) for a project. I want to parse a file whose structure is the following: section1 { something; } I am using the file_iterator to iterate on the input file and then define comment as well as the grammar. I am at my wits end why my parser keeps failing. (When this simple grammar works, I want to make the parser more complex.) My code is attached below. (Note: I used the example in the distribution c_grammar.cpp as the starting point for it.) Thanks. -surinder PS: This input file structure is going to be, of course, more complicated than the example shown above. Inside the setions, I would like to pass on flags and statements to the code. If it is better for me to use another approach to parse this file structure, please suggest me. #include <iostream> #include <fstream> #include <vector> #include <boost/spirit.hpp> /* Input file for this looks like: file { something; } */ ////////////////////////////////////////////////////////////////////// ///////// // used namespaces using namespace boost::spirit; using namespace std; ////////////////////////////////////////////////////////////////////// ///////// // parsing helper function // Here's our comment rule struct skip_grammar : public grammar<skip_grammar> { template <typename ScannerT> struct definition { definition(skip_grammar const& /*self*/) { skip = space_p | comment_p("//") // C++ comment | comment_p("/*", "*/") // C comment | comment_p("#") // added for correctly ; } rule<ScannerT> skip; rule<ScannerT> const& start() const { return skip; } }; }; ////////////////////////////////////////////////////////////////////// ///////// // typedef typedef char CharT; typedef file_iterator <CharT> IteratorT; typedef scanner <IteratorT> ScannerT; typedef rule <ScannerT> RuleT; template<typename GrammarT> void parse(GrammarT const& g, char const* filename) { ifstream in(filename); if (!in) { cerr << "Could not open input file: " << filename << endl; return; } IteratorT start(filename); if (!start) { cerr << "Could not open the file " << endl; return ; } IteratorT end = start.make_end(); skip_grammar skip; parse_info<IteratorT> result = parse(start, end, g, skip); if (result.full) cerr << filename << " Parses OK" << endl; else { cerr << filename << " Fails Parsing" << endl; for (int i = 0; i < 50; i++) { if (result.stop == end) break; cerr << *result.stop++; } cerr << endl; } } struct c_grammar : public grammar<c_grammar> { template <typename ScannerT> struct definition { definition(c_grammar const& /*self*/) : SEMICOLON(';'), COMMA(','), COLON(':'), ASSIGN('='), LEFT_PAREN('('), RIGHT_PAREN(')') { // C keywords keywords = "file", "physics", "math"; // C operators LEFT_BRACE = chlit<>('{') | strlit<>("<%"); RIGHT_BRACE = chlit<>('}') | strlit<>("%>"); LEFT_BRACKET = chlit<>('[') | strlit<>("<:"); RIGHT_BRACKET = chlit<>(']') | strlit<>(":>"); // Tokens FILE = strlit<>("file"); PHYSICS = strlit<>("physics"); MATH = strlit<>("math"); // string literals STRING_LITERAL_PART = lexeme_d[ !chlit<>('L') >> chlit<>('\"') >> *( strlit<>("\\\"") | anychar_p - chlit<>('\"') ) >> chlit<>('\"') ] ; STRING_LITERAL = +STRING_LITERAL_PART; // Rules file_statement = FILE >> LEFT_BRACE >> *(anychar_p) >> RIGHT_BRACE; // does not work // file_statement = *(anychar_p); // parses OK translation_unit = file_statement; } symbols<> keywords; chlit<> SEMICOLON, COMMA, COLON, ASSIGN, LEFT_PAREN, RIGHT_PAREN; rule<ScannerT> LEFT_BRACE, RIGHT_BRACE, LEFT_BRACKET, RIGHT_BRACKET; rule<ScannerT> FILE, PHYSICS, MATH, STRING_LITERAL, STRING_LITERAL_PART; rule<ScannerT> file_statement, translation_unit; rule<ScannerT> const& start() const { return translation_unit; } }; }; ////////////////////////////////////////////////////////////////////// ///////// // main entrypoint int main(int argc, char* argv[]) { // Start grammar definition cerr << "C Grammar checker implemented with Spirit ..." << endl; // main driver code c_grammar g; if (2 == argc) parse(g, argv[1]); else cerr << "No filename given" << endl; return 0; }

1 0

Re: [Boost-Users] Newbie shared_ptr in a container question.
by Joshua Little 31 Jul '03

31 Jul '03

>From: "Duane Murphy" <duanemurphy(a)mac.com> >Reply-To: Boost-Users(a)yahoogroups.com >To: "Boost Users" <Boost-Users(a)yahoogroups.com> >Subject: Re: [Boost-Users] Newbie shared_ptr in a container question. >Date: Sun, 27 Jul 2003 09:17:48 -0700 > >--- At Sat, 26 Jul 2003 19:57:17 +0000, Joshua wrote: > > >I've been reading through posts on here and in the docs but I think I may > >have missed something. Heres what I am trying to do: > >lets say I have a class Foo* and I'm trying to use it in a > >std::vector<shared_ptr<Foo> >. I can add them all day long and it works > >fine. The problem is that when I try to remove the shared_ptr from the > >vector. I expected it to delete the memory for the Foo* then delete > >itself (to completely free the memory that the shared_ptr used and the > >memory that the Foo was using. I think this is not happening though since > >the destructor is not being called when the elements are removed from the > >vector. Heres how I am currently inserting the shared_ptr's into the > >vector (yes I know this is the wrong way now that I've read a few of the > >posts here): > > > >typedef std::vector<boost::shared_ptr<Foo> > FooVector; > > > >FooVector Foobar; > >Foo* blah = new Foo(); > >boost::shared_ptr<Foo> * NewPointer = new boost::shared_ptr<Foo>(blah); > >Foobar.insert(*NewPointer); //Yes I know this looks horrible. And its > >probably wrong. > > > > > >When I call Foobar.erase() I thought that the shared_ptr would be removed > >and the memory freed (and Foo's destructor called). I tried it like this >: > >FooVector::iterator CurrentFoo = Foobar.begin(); > >Foobar.erase(CurrentFoo); > > > >That did remove the shared_ptr but the Foo* did not seem to get > >deallocated, its destructor was never called. Some of the posts seem to > >indicate that this is a very bad way to let shared_ptr manager the > >memory, is there a better way to do what I want to do using shared_ptr or > >is shared_ptr the wrong tool to use? > >There have been many good suggestions as to what the correct sequence for >inserting the shared_ptr into the vector. I'm not sure the real problem >has been adequately explained. Why isnt the foo* being deleted. > >Shared_ptr<> counts the number of instances of the pointer that are >created. When you did: > >boost::shared_ptr<Foo> * NewPointer = new boost::shared_ptr<Foo>(blah); > >You created the first instance; count == 1. > >When you did: > >Foobar.insert(*NewPointer); //Yes I know this looks horrible. And its > >A copy of the shared_ptr<> was made. The count is now 2. > >When you did: > >Foobar.erase(CurrentFoo); > >One copy (of two) was "deleted". In this sense, the shared_ptr<> was >deleted. The destructor for the shared counter mearly decrements the >counter. Count == 1. > >The problem is that the original count was leaked by using "new >shared_ptr<>". This is why all the suggestions show that you should be >using the stack based method for shared_ptr<>. > >Shared_ptr is almost never allocated from the heap. There really is not >much point. It's use is as a value representation of pointer. > >I hope this helps you understand where your code went astray. > >Good luck, > ...Duane > > > > > ...Duane > Reading many of these replys I now see why what I was doing wasn't working, so I'm going to change my code around and hopefully get this cleared up. Thanks to everyone for your help :) _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

2 1

Newbie: Way to convert "pointer-to-member-function" to a "pointer-to-function".
by Amit Bhatia 31 Jul '03

31 Jul '03

Hello All!, I am trying to figure out a way of converting "pointer-to-member-function" to a "pointer-to-function" so that I can pass it as a callback function pointer to constructor of some third party class. I know there is NO direct way of doing this in c++. I am further constrained because of the following facts: 1. The fact that I am using a third party class for whose constructor I need to pass pointers to functions having some specific signature. 2. I don't want to be using static declaration for the method that I wish to pass to the third party constructor as a callback function(due to the fact that static methods can access only access static data members). So if I am not mistaken, then, I suppose, that boost function library might be of help in here by somehow using some elegant tricks' to do this task. (There is the fact also that every instance of my class has lot of data which is different and I need access to the data for the method that I wish to pass). Am I right, or am I looking at the wrong place? If I am indeed looking at the wrong place then where will it be best to look for it. I remember some notes on binding in the documentation of the boost function library though. Thanks in advance, regards, amit.

1 0

Detecting None in Boost.Python
by ahakim777 31 Jul '03

31 Jul '03

Hi, This is a Boost.Python question. How do I detect that a Python function has passed a 'None' to a wrapped C++ function? Cheers, Ammar

2 1

filesystem::path & wide char strings?
by Cody Batt 30 Jul '03

30 Jul '03

Hello, I want to use the filesystem::path class for a project I'm working on, but I need to support wide character strings in the path names. I might be missing something, but it seems that path only supports std::string. Is this because of a portability issue or what is the rationale for not using something like basic_string<CharType>? Are there any plans to provide support for wide character strings in the future? Thanks, Cody Batt

2 1

howto map c++ namespaces using boost::python?
by cavok＠filibusta.crema.unimi.it 30 Jul '03

30 Jul '03

hi all, i'm a newbie user of Boost. i need some suggestions to expose c++ namespaces in python. in python i use classes as namespaces, but using class_ construct to build python classes seems to not be applicable to c++ namesapces. moreover, i have a global c++ object which i'd like to map onto python. it is not that clear to me how i can achieve this result. thanks domenico -----[ Domenico Andreoli, aka cavok --[ http://filibusta.crema.unimi.it/~cavok/gpgkey.asc ---[ 3A0F 2F80 F79C 678A 8936 4FEE 0677 9033 A20E BC50

2 1

Boost Bind on MSVC 7.1
by Dale Peakall 30 Jul '03

30 Jul '03

The following example is a very simple, and contrived, example that demonstrates the problem I'm seeing. This fails to compile with 'term does not evaluate to a function taking 1 arguments'. Is this a problem with bind on MSVC 7.1, or have I just forgotton how to use it/what it can do. - Dale. #include <iostream> #include <string> #include <boost/bind.hpp> int my_function(std::string const& value) { return static_cast<int>(value.length()); } int main() { std::string my_string("hello world!"); std::cout << boost::bind<int>(_1, my_string)(my_function); }

2 1

boost.python exception
by newwz2003 29 Jul '03

29 Jul '03

Can I raise exception in C++ module can catch it in python ? or where can I get detailed doc about boost.python? Thank you

2 1

Deferred Function Forwarding
by vivek_arora 29 Jul '03

29 Jul '03

I am looking for pointers on how to use boost to implement a set of template classes/helper functions which can be used for deferred function/method call forwarding. Here's an example of illustrating what I wish to accomplish. I can live with restictions on the function argument types. //Define a template type which can capture arguments of any (or most) functions. I believe boost tuple could suit my requirements. //Define a template helper function save_args which constructs a arguments tuple based on the signature of the function passed as the first argument. e.g . R f(T1, T2, T3); boost:tuple<R, T1, T2, T3> args = save_args(f, t1, t2, t3); //Don't want to explicitly specify types like save_args<R,T1,T2,T3> (t1,t2,t3) //Define another template helper function call_with_args which given another function "g" with a signature conforming with "f" and the argument tuple invokes "g" e.g. R g(T1, T2, T3) //This should call g(args.get<0>, args.get<1>, args.get<2>) call_with_args(g, args); Could someone provide ideas, pointers/sample code for implementing save_args, call_with_args helper template functions. Thanks -Vivek Arora

3 2

Feature Suggestion
by everwicked 29 Jul '03

29 Jul '03

Hello guys, I have just been introduced to the library by some people at Efnet's #c++ and I have to say there is quite a lot of useful work in there. I hope boost makes it into the standard. It's about time to get a feature rich std library. Want I wanted to ask you is to provide a few more functions in library interval. I was comparing boost with blitz++ as the parts I need at the moment are mainly of scientific nature. Anyways, I found boost more to my likeness because it has other features I might want to use later, because it supports more compilers and lastly because it's API is better organised in my opinion. The functions that I find that are missing from library 'interval' are the ones listed here: http://www.oonumerics.org/blitz/manual/blitz03.html#l77 Is there any chance you could implement them in boost? I wouldn't ask but I think that they are not a lot of work. Thanks in advance. Kind regards, George

3 2

boost_date_time: ftime ==>gettimeofday for microsec_clock?
by dick.bridges＠tais.com 28 Jul '03

28 Jul '03

I need a microsec_clock on Windows XP. My first impulse is to define gettimeofday() implemented using ftime(). Should this work ok or am I missing something obvious? TIA

1 0

Newbie - stack overflow in connected components
by Frank H 28 Jul '03

28 Jul '03

Hello: Environment: Windows 2K, MSVC 6 SP5, Boost 1.30.0 I'm new to BGL ( 2 days experience ) and am trying to use the connected components graph. My implementation seems to be OK for my small test case ( 10 verticies) but when I run my "real data" through it ( 15000 verticies) I get a stack overflow error. I note that there is a patch in the sourceforge CVS for the dfs algoritm which implements a non-recursive solution from dgregor that I understand will avoid the stack overflow. I naively downloaded the "depth_first_search.hpp" V1.35 from the CVS and of course it doesn't compile. The question: "How can I apply the patch to fix the stack problem( ie how to determine what and where are the other files I need or do I download the entire current version ( ie tag MAIN)?" Thanks for any help Frank

4 9

RE: [Boost-Users] Newbie missing a header for boost_date_time?
by dick.bridges＠tais.com 28 Jul '03

28 Jul '03

<history> <snip/> > ...which refers to lexical_cast.hpp > > template<typename Target, typename Source> > class lexical_stream > { > bool operator<<(const Source &input) > { > here ===> return stream << input; <==== here > } > } <snip/> I'm starting to think this may be related to the 1_30_0 lexical cast problem. Can you upgrade lexical_cast.hpp from cvs? You can download it from here: http://cvs.sourceforge.net/cgi- bin/viewcvs.cgi/boost/boost/boost/lexical_cast.hpp Jeff </history> I downloaded the head this (Monday) morning and replaced the 1_30_0 version. Compile error disappeared. (Sanity check: copied the 'old' version back and compile error re-appears.) Thanks for the help. That was driving me nuts.

1 0

link problems with precompiled headers and boost libs?
by co_tangens 28 Jul '03

28 Jul '03

Hi, I'm using the datetime library of boost 1_30_0 with VC7.1 with precompiled headers on. We're getting the following link warnings/errors: om.lib(bg_extra.obj) : warning LNK4006: ___@@_PchSym_@00@UwvevolknvmgUtnkEPozhgUhlfixvUytPzwwOlyq@ already defined in om.lib(bg_init.obj); second definition ignored om.lib(bg_extra.obj) : error LNK2005: ___@@_PchSym_@00@UwvevolknvmgUtnkEPozhgUhlfixvUytPzwwOlyq@ already defined in om.lib(bg_init.obj) We include boost headers in our own header files. Our own headerfiles are then used to create a precompiled header. It seems that all object files that use the precompiled header get these link errors... Does anyone know the reason/ a solution for this error? Thanks a lot!

1 1

spirit & tokenizer
by Andrey Sverdlichenko 28 Jul '03

28 Jul '03

Hello. Is there any "right way" to parse strings, already splitted with tokenizer? I wrote iterator that can work with this splitted strings, but i also need some "skip parser" to recognize token boundaries as whitespaces and can't design one. -- Best regards, Andrey mailto:blaze@lists.infosec.ru

4 7

lexical_cast problem with Unicode
by Stefan Felkel 27 Jul '03

27 Jul '03

I have problems compiling the following piece of code under Microsoft Visual C++ 6.0 with UNICODE defined. The compiler complains about a missing operator<<. What can I do in order to get this programme compiled ? #include <iostream> #include <boost/lexical_cast.hpp> int main( int argc, char * argv [] ) { std::wcout << boost::lexical_cast<std::wstring>( std::wstring( L"test" ) ).c_str() << L"\n"; return 0; } c:\programme\boost_1_30_0\boost\lexical_cast.hpp(148): error C2679: binary '<<': no operator defined which takes a right-hand operand of type 'const wstring' (or there is no acceptable conversion) c:\programme\boost_1_30_0\boost\lexical_cast.hpp(146): while compiling class-template member function 'bool boost::detail::lexical_stream<wstring,wstring>::operator <<(const wstring &)' Thanks in advance, Stefan

3 2

Announce: Advanced Los Angeles C++ Users Group
by Jon Stewart 27 Jul '03

27 Jul '03

Hi! A small group of like-minded C++ programmers in Pasadena, CA has been meeting regularly for the past few months. The group's name is ALACPP, for Advanced Los Angeles C++, and we're interested in teaching ourselves more about generic programming and other advanced C++ techniques. Obviously, we're Boost users! We read books together and have weekly lunch meetings to discuss them; we just finished _Modern C++ Design_ and are moving on to Herb Sutter's _Exceptional C++_. We're also organizing periodic evening meetings, to explore specific topics in depth. If you'd like to give a relevant presentation to the group, please contact me! If you're in the Los Angeles area, I invite you to check out the group. Our meager website can be found here: http://www.alacpp.org and you can sign up for our mailing list here: http://lists.ellipsis.cx/mailman/listinfo/alacpp Thanks! Jon -- Jon Stewart stew1(a)ellipsis.cx

3 4

Newbie shared_ptr in a container question.
by Joshua 27 Jul '03

27 Jul '03

I've been reading through posts on here and in the docs but I think I may have missed something. Heres what I am trying to do: lets say I have a class Foo* and I'm trying to use it in a std::vector<shared_ptr<Foo> >. I can add them all day long and it works fine. The problem is that when I try to remove the shared_ptr from the vector. I expected it to delete the memory for the Foo* then delete itself (to completely free the memory that the shared_ptr used and the memory that the Foo was using. I think this is not happening though since the destructor is not being called when the elements are removed from the vector. Heres how I am currently inserting the shared_ptr's into the vector (yes I know this is the wrong way now that I've read a few of the posts here): typedef std::vector<boost::shared_ptr<Foo> > FooVector; FooVector Foobar; Foo* blah = new Foo(); boost::shared_ptr<Foo> * NewPointer = new boost::shared_ptr<Foo>(blah); Foobar.insert(*NewPointer); //Yes I know this looks horrible. And its probably wrong. When I call Foobar.erase() I thought that the shared_ptr would be removed and the memory freed (and Foo's destructor called). I tried it like this : FooVector::iterator CurrentFoo = Foobar.begin(); Foobar.erase(CurrentFoo); That did remove the shared_ptr but the Foo* did not seem to get deallocated, its destructor was never called. Some of the posts seem to indicate that this is a very bad way to let shared_ptr manager the memory, is there a better way to do what I want to do using shared_ptr or is shared_ptr the wrong tool to use?

5 4

Building Thread Tests on Red Hat 9.0
by Paul Grenyer 26 Jul '03

26 Jul '03

Hi All I'm trying the boost threading library for the first time. I've successfully built the threading library itself and now I want to build the tests. I've followed the instructions, but the build seems to hang at this point: execute-test ../../../libs/thread/test/bin/test_once.test/gcc/debug/runtime-link-dynamic/threading-multi/test_once.run Is this normal? I've left it for a few minutes to see if I was just being impatient, but it doesn't continue. Also, I've been looking for some code examples in the documentation on the website, I seem to remember there being some when I looked at potentially using the threads on Windows about 18 months ago, but I can't find them now. Any pointers greatly appreciated. -- Regards Paul Paul Grenyer Email: pjgrenyer(a)iee.org Web: www.paulgrenyer.co.uk EvaneScence: http://www.evanescence.com

1 0

Newbie: boost::filesystem::fstream base class undefined error
by sea2stl 25 Jul '03

25 Jul '03

I am using VC++6 SP5, STLPort 4.5.3, boost 1.30.0. I am tring to use boost::filesystem::fstream objects in conjuction with boost::filesystem::path objects. When I create an ifstream object, the compiler gives the following message: error C2504: 'basic_ifstream<char,class _STL::char_traits<char> >' : base class undefined. Above error takes me to ln 47 in fstream.hpp. Similar problem with ofstream. Any suggestions? Thanks, Aaron Laws

1 0

RE: [Boost-Users] Newbie missing a header for boost_date_time?
by Jeff Garland 25 Jul '03

25 Jul '03

Dick B. wrote: > I'm pretty sure the headers are being found. If I replace posix_time.hpp > with posix_time_types.hpp, the error and many of the warnings disappear. > In other words... Ok. > #include <boost/date_time/gregorian/gregorian.hpp> > //#include <boost/date_time/posix_time/posix_time.hpp> > #include <boost/date_time/posix_time/posix_time_types.hpp> > > avoids the error message. This is because commenting out 'posix_time.hpp' eliminates the I/O code from the library. This is the part that uses lexical_cast which is where the error is occuring. > ...which refers to lexical_cast.hpp > > template<typename Target, typename Source> > class lexical_stream > { > bool operator<<(const Source &input) > { > here ===> return stream << input; <==== here > } > } > > So I assume there's a header somewhere that defines the '<<' operator > referred to. I don't know if this is related to my use of VC7.1 or not. > I'm trying to find someone around here with VC7 to build boost_1_30_0 and > see if that makes a difference. No luck so far. I'm starting to think this may be related to the 1_30_0 lexical cast problem. Can you upgrade lexical_cast.hpp from cvs? You can download it from here: http://cvs.sourceforge.net/cgi- bin/viewcvs.cgi/boost/boost/boost/lexical_cast.hpp Jeff

1 0

Need help with BOOST unit test framework!
by rudugani 25 Jul '03

25 Jul '03

hi, Essentially what I'm trying to do(the code is attached below) , is pass a base class member pointer (member function should automatically be visible in the derived class) , to the BOOST framework. However, since the member function is statically not visible in the derived class, a compile time error is generated . I'm *thinking* that some kind of casting operation is required but not very sure how! could anybody enlighten me as to how to get the code snippet below running? Thanks! CODE: #include <iostream.h> /*-------------------- BOOST FRAMEWORK --------------------- */ #include <test/included/unit_test_framework.hpp> using boost::unit_test_framework::test_suite; class baseTrailTest{ public: baseTrailTest(){}; ~baseTrailTest(){}; protected : void trail(){ cout << " trail!!!! " << endl; } }; class TrailTest: public baseTrailTest{ }; struct trail_test_suite : public test_suite { trail_test_suite() : test_suite("trail_test_suite") { // add member function test cases to a test suite boost::shared_ptr<TrailTest> instance(new TrailTest); add( BOOST_CLASS_TEST_CASE( &TrailTest::trail ,instance ), 0 ); } }; test_suite* init_unit_test_suite( int argc, char * argv[] ) { std::auto_ptr<test_suite> test( BOOST_TEST_SUITE( "example" ) ); /*if( argc < 2 ) return (test_suite*)0;*/ test->add( new trail_test_suite); return test.release(); }

2 1

using the signals lib
by Roel Vanhout 25 Jul '03

25 Jul '03

Hello all, I'm sorry if this is a faq (it almost has to be) but I couldn't find anything in the signals documentation nor in the general build instruction. I've build the signals library using jam as described in the build instructions, I've added the resulting library to my linker list but then I get the errors below about several symbols being multiply defined. I'm using MSVC 7.0 (Visual Studio .Net, not .Net 2003). What do I do wrong? Thanks. cheers, roel ------ Build started: Project: boost_signaltest, Configuration: Debug Win32 ------ Linking... msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in boost_signaltest.obj msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in boost_signaltest.obj msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(char const *)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBD@Z) already defined in boost_signaltest.obj MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: __thiscall exception::exception(void)" (??0exception@@QAE@XZ) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: virtual __thiscall exception::~exception(void)" (??1exception@@UAE@XZ) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: __thiscall exception::exception(class exception const &)" (??0exception@@QAE@ABV0@@Z) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: int __thiscall type_info::operator==(class type_info const &)const " (??8type_info@@QBEHABV0@@Z) already defined in LIBCD.lib(typinfo.obj) MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj) MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj) LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library Debug/boost_signaltest.exe : fatal error LNK1169: one or more multiply defined symbols found Build log was saved at "file://c:\test\boost_signaltest\boost_signaltest\Debug\BuildLog.htm" boost_signaltest - 10 error(s), 1 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped -- Roel Vanhout - Programmer/Systems Administrator RIKS BV Papenstraat 8 - 6211 LG Maastricht Tel +31 (0)43 388 3708 - Fax +31 (0)43 325 3155

2 1

RE: [Boost-Users] Newbie missing a header for boost_date_time?
by dick.bridges＠tais.com 24 Jul '03

24 Jul '03

<previous> > I must be missing one or more headers but I can't figure it out. Can > someone help get me pointed in the right direction? > ...lots of compiler stuff omitted... My guess is that you don't have the boost root directory in your include path options. This would be the boost\boost_1_30_0 directory.... HTH, Jeff </previous> I'm pretty sure the headers are being found. If I replace posix_time.hpp with posix_time_types.hpp, the error and many of the warnings disappear. In other words... #include <boost/date_time/gregorian/gregorian.hpp> //#include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/posix_time/posix_time_types.hpp> avoids the error message. Changing it back to: #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/date_time/posix_time/posix_time.hpp> //#include <boost/date_time/posix_time/posix_time_types.hpp> results in... <error> c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : error C2679: binary ' <<' : no operator found which takes a right-hand operand of type 'const boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type' (or there is no acceptable conversion) with [ TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(30) : see reference to function template instantiation 'Target boost::lexical_cast<unsigned short,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=unsigned short, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(18) : see reference to function template instantiation 'time_duration boost::date_time::parse_delimited_time_duration<boost::posix_time::time_duration>(const std::string &)' being compiled with [ time_duration=boost::posix_time::time_duration ] </error> ...which refers to lexical_cast.hpp template<typename Target, typename Source> class lexical_stream { bool operator<<(const Source &input) { here ===> return stream << input; <==== here } } So I assume there's a header somewhere that defines the '<<' operator referred to. I don't know if this is related to my use of VC7.1 or not. I'm trying to find someone around here with VC7 to build boost_1_30_0 and see if that makes a difference. No luck so far.

1 0

[uBLAS] Constructing from std::vector
by Alex Henderson 24 Jul '03

24 Jul '03

Hi, I'm starting to play with the uBLAS library. So far so good... I'd like to be able to construct a ublas::vector from a std::vector. I can't seem to find how to do this. Do I have to go through std::copy or something equivalent or is there a constructor I've missed? If it doesn't exist, is there a reason why not? Perhaps there are some holes in my understanding. Thanks, Alex

1 0

Binary compatibility of boost dll files
by Rodolfo Lima 24 Jul '03

24 Jul '03

I see that several boost libraries can be compiled as dll files. I'd like to know if there's any concern about binary compatilibity between different versions of those dll's as boost's version number (and possibly the library itself) changes. For instance, whenever MFC's dll binary interface changes, we have another library version written in it's name (MFC42.dll, MFC70.dll, MFC71.dll...), this way we can help avoiding "dll hell". It would be also cool to link a version resource in each dll. This way, installers would check if a newer dll exists in the system, avoiding overwriting with an older one. And one last thing... the import library of date_time's dll isn't being generated, making it unusable. It's better to delete the dll target of its jamfile. If any help of my part is needed, I'd be glad to help. regards, rod

2 1

RE: [Boost-Users] Is there a boost_date_time dll?
by Jeff Garland 24 Jul '03

24 Jul '03

> Development environment is .NET 2003 (i.e., VC7.1). > > I'm reasonably sure there were no errors when I built boost_1_30_0. > > \boost_1_30_0\libs\date_time\build\bin\boost_date_time.dll certainly exists > - but it's a directory that contains a subdirectory (. > \vc7\debug\runtime-link-dynamic) that contains a .CMD, .pdb and two .obj > files. As the old saying goes: "I can see fine - I just don't understand > what I'm looking at." > > I'm clearly having a "senior moment" but honestly: I searched boost.org, > google.com and [even] altavista.com/web/adv. > > Any pointers to get me back on the right track would be appreciated. Couple of thoughts here: 1) Look for the static lib instead. This is the one I'm sure works. And anyway, there is hardly anything in the library anyway so there really isn't an much advantage to a dll. 2) Try doing the library build again, but at the date-time level only. Change down to libs/date_time/build and run bjam. This might give you some hints about what actually built. Jeff

1 0

RE: [Boost-Users] Newbie missing a header for boost_date_time?
by Jeff Garland 24 Jul '03

24 Jul '03

> I must be missing one or more headers but I can't figure it out. Can > someone help get me pointed in the right direction? > ...lots of compiler stuff omitted... My guess is that you don't have the boost root directory in your include path options. This would be the boost\boost_1_30_0 directory.... HTH, Jeff

1 0

RE: [Boost-Users] boost::date_time + setting system clock
by Jeff Garland 24 Jul '03

24 Jul '03

> I was wondering if it is possible to set the clock using date_time. I been >looking but have found no clue that it is so. From what I have seen so far, > this library does a lot of cool stuff, and why not this. I'm afraid the library doesn't support this feature. Contributions are always welcome, though ;-) > I am working on a little personal project that uses an ORB. The idea is > to have all clocks synchronized. I have one machine that queries an > atomic time server. After having done so it will call each machine > and synchronize them. I am currently running a mix of Linux, Solaris, > WIN NT 2000 and XP... and it freaks me out not to have them > synchronized. Why not just use NTP? http://www.ntp.org/ Jeff

2 1

Problem with regular expression
by Javier de Acha 24 Jul '03

24 Jul '03

Hello, The next few lines doesn't work (1) with \s. But (2) works well [[:space:]] regbase::escape_in_lists dont func? Someone it knows because? Thanks Javier --------------------------------------------------------------------- (1) void main() { regex exp("\s(ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this fail } } -------------------------------------------------------------------------------- (2) void main() { regex exp("[[:space:]](ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this succesfully match } } [Non-text portions of this message have been removed]

2 1

Random Number Generation
by tylersc111 23 Jul '03

23 Jul '03

I've got three questions/comments regarding the Random Number Library: Question (1) --------------------------------------------------------- How about including a facility for generating "antithetic random variates"? (Do a google search if the term is unfamiliar). A partial implementation might be something like the following, (I haven't tried compiling this, so please pardon any syntax errors...): template< class URNG > // Uniform Random Number Generator class antithetic { private: URNG urng; public: explicit antithetic( s ) { urng.seed(s); } // Perhaps not quite right (see question (2) below) typename URNG::result_type operator()() { return URNG::max_value - urng(); } }; Then one would be able to construct two antithetic variates (rng1 & rng2) as follows: mt19937 rng1(seed); antithetic<mt19937> rng2(seed); Question (2) -------------------------------------------------------- Regarding the "uniform_01" generator (and a possible bug in "uniform_in_sphere"). The interval generated by uniform_01 is designed to be the "half-open" interval [0,1). The asymmetry seems unnecessary. How about using the open interval (0,1). I can appreciate that perhaps efficiency is the reason for using the interval [0,1) if one is generating the random floating point numbers by setting the mantissa with a random bit stream. But, consider the following advantage to using (0,1): You would avoid a possible zerodivide in the "uniform_in_sphere" class. Here's my reasoning: Using the current "uniform_01" generator with the half open interval [0,1) the normal_distribution::operator() can return zero. Using my proposed "uniform_01" generator with the open interval (1,1) the normal_distribution::operator() will never return exactly zero. The "zero" return from normal_distribution::operator() could conceivably cause a zerodivide in "uniform_in_sphere". Question (3) -------------------------------------------------------- How about having a boost random number generator whose output would match that of Matlab's random number generator (both uniform and gaussian)? This would be useful in doing sanity tests when porting code to/from Matlab. Here's a link which gives some info on their generators: http://www.mathworks.com/support/solutions/data/8542.shtml

1 0

Newbie missing a header for boost_date_time?
by dick.bridges＠tais.com 23 Jul '03

23 Jul '03

I must be missing one or more headers but I can't figure it out. Can someone help get me pointed in the right direction? <extract> #include "boost/date_time/gregorian/gregorian.hpp" #include "boost/date_time/posix_time/posix_time.hpp" using namespace boost::posix_time; using namespace boost::gregorian; date d(2002,Feb,1); </extract> <results> c:\boost\boost_1_30_0\boost\date_time\gregorian\greg_month.hpp(51) : warning C4244: 'argument' : conversion from 'boost::gregorian::greg_month::month_enum' to 'boost::CV::constrained_value<value_policies>::value_type', possible loss of data with [ value_policies=boost::gregorian::greg_month_policies ] c:\boost\boost_1_30_0\boost\date_time\gregorian\greg_date.hpp(77) : warning C4244: 'argument' : conversion from 'boost::gregorian::date_duration_rep' to 'boost::CV::constrained_value<value_policies>::value_type', possible loss of data with [ value_policies=boost::gregorian::greg_day_of_year_policies ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(65) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data c:\boost\boost_1_30_0\boost\iterator_adaptors.hpp(1409) : see reference to class template instantiation 'boost::filter_iterator_generator<Predicate,Iterator,Value,Reference,Pointer,Category,Distance>' being compiled c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(69) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::hour_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(68) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::hour_type boost::date_time::time_duration<T,rep_type>::hours(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c: \boost\boost_1_30_0\boost\date_time\posix_time\posix_time_config.hpp(62) : see reference to class template instantiation 'boost::date_time::time_duration<T,rep_type>' being compiled with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(74) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::min_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(73) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::min_type boost::date_time::time_duration<T,rep_type>::minutes(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(79) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::sec_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(78) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::sec_type boost::date_time::time_duration<T,rep_type>::seconds(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(39) : warning C4244: 'initializing' : conversion from 'boost::date_time::counted_time_rep<config>::int_type' to 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type', possible loss of data with [ config=boost::posix_time::millisec_posix_time_system_config ] and [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(38) : while compiling class-template member function 'boost::date_time::counted_time_rep<config>::date_type boost::date_time::counted_time_rep<config>::date(void) const' with [ config=boost::posix_time::millisec_posix_time_system_config ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(72) : see reference to class template instantiation 'boost::date_time::counted_time_rep<config>' being compiled with [ config=boost::posix_time::millisec_posix_time_system_config ] c:\boost\boost_1_30_0\boost\date_time\time.hpp(48) : see reference to class template instantiation 'boost::date_time::counted_time_system<time_rep>' being compiled with [ time_rep=boost::posix_time::int64_time_rep ] c:\boost\boost_1_30_0\boost\date_time\posix_time\ptime.hpp(19) : see reference to class template instantiation 'boost::date_time::base_time<T,time_system>' being compiled with [ T=boost::posix_time::ptime, time_system=boost::posix_time::posix_time_system ] c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(120) : warning C4244: 'initializing' : conversion from 'unsigned long' to 'unsigned short', possible loss of data c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\streambuf(250) : while compiling class-template member function 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::ymd_type boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::from_day_number(boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type)' with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c: \boost\boost_1_30_0\boost\date_time\gregorian\greg_calendar.hpp(22) : see reference to class template instantiation 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>' being compiled with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(121) : warning C4244: 'initializing' : conversion from 'unsigned long' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(125) : warning C4244: 'argument' : conversion from 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type' to 'unsigned short', possible loss of data with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(30) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(17) : see reference to function template instantiation 'date_type boost::date_time::parse_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(31) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(32) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(54) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(22) : see reference to function template instantiation 'date_type boost::date_time::parse_undelimited_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(55) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(56) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(103) : warning C4244: 'initializing' : conversion from 'int' to 'short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(130) : see reference to function template instantiation 'time_duration boost::date_time::parse_undelimited_time_duration<time_duration>(const std::string &)' being compiled with [ time_duration=time_duration ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(26) : see reference to function template instantiation 'time_type boost::date_time::parse_iso_time<boost::posix_time::ptime>(const std::string &,char)' being compiled with [ time_type=boost::posix_time::ptime ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : warning C4800: 'void *' : forcing value to bool 'true' or 'false' (performance warning) c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=int, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=int, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(28) : see reference to function template instantiation 'Target boost::lexical_cast<int,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=int, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(17) : see reference to function template instantiation 'date_type boost::date_time::parse_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : error C2679: binary ' <<' : no operator found which takes a right-hand operand of type 'const boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type' (or there is no acceptable conversion) with [ TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(30) : see reference to function template instantiation 'Target boost::lexical_cast<unsigned short,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=unsigned short, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::alloca tor<char>>::const_iterator,std::string>::value_type ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(18) : see reference to function template instantiation 'time_duration boost::date_time::parse_delimited_time_duration<boost::posix_time::time_duration>(const std::string &)' being compiled with [ time_duration=boost::posix_time::time_duration ] Build log was saved at "file://c:\dev\AuthStorm\Debug\BuildLog.htm" AuthStorm - 1 error(s), 18 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped </results>

1 0

Is there a boost_date_time dll?
by dick.bridges＠tais.com 23 Jul '03

23 Jul '03

Development environment is .NET 2003 (i.e., VC7.1). I'm reasonably sure there were no errors when I built boost_1_30_0. \boost_1_30_0\libs\date_time\build\bin\boost_date_time.dll certainly exists - but it's a directory that contains a subdirectory (. \vc7\debug\runtime-link-dynamic) that contains a .CMD, .pdb and two .obj files. As the old saying goes: "I can see fine - I just don't understand what I'm looking at." I'm clearly having a "senior moment" but honestly: I searched boost.org, google.com and [even] altavista.com/web/adv. Any pointers to get me back on the right track would be appreciated.

1 0

RE: [Boost-Users] Problem with regular expression
by James Zappia 23 Jul '03

23 Jul '03

You need to escape the backslash in your exp variable. Here's (1) that works. #include <iostream> #include <string> #include <boost/regex.hpp> using namespace std; using namespace boost; int main() { regex exp("\\s(ab)*", regbase::perl); // note the escaped \s here cmatch what; if ( regex_match(" ababab", what, exp) ) { string str = what[0]; cout << str << endl; } } Regards, James -----Original Message----- From: Javier de Acha [mailto:jdeacha@corest.com] Sent: Wednesday, July 23, 2003 10:50 AM To: Boost-Users(a)yahoogroups.com Subject: [Boost-Users] Problem with regular expression Hello, The next few lines doesn't work (1) with \s. But (2) works well [[:space:]] regbase::escape_in_lists dont func? Someone it knows because? Thanks Javier --------------------------------------------------------------------- (1) void main() { regex exp("\s(ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this fail } } ---------------------------------------------------------------------------- ---- (2) void main() { regex exp("[[:space:]](ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this succesfully match } } [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges & Refill Kits for Your Epson at Myinks.com Free shipping on orders $50 or more to the US and Canada. http://www.c1tracking.com/l.asp?cid=5705&lp=home/epson.asp http://us.click.yahoo.com/brYXfA/_xWGAA/ySSFAA/EbFolB/TM ---------------------------------------------------------------------~-> Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

1 0

RE: [Boost-Users] date-time library and ispunct() ambiguity under MSVC6
by Jeff Garland 23 Jul '03

23 Jul '03

Carl wrote: > I get the following compilation error for this simple program under MSVC6: > > ************** test.cpp****************** > #include <iostream> > #include "boost/date_time/gregorian/gregorian.hpp" > > int main() > { > using namespace std; > > cout << ispunct(',') << endl; > > return 0; > } > > ************************************ > > error: > --------------------Configuration: names_test - Win32 > Debug-------------------- > Compiling... > test.cpp > c:\documents and settings\waldbcar.waldbcar\my documents\my > projects\vc\test\names_test\test.cpp(8) : error C2668: 'ispunct' : > ambiguous call to overloaded function > Error executing cl.exe. > > test.obj - 1 error(s), 0 warning(s) > > been dumped into the global namespace by default. However, it seems like > the date-time library must be doing something like: > > namespace std > { > using ::ispunct; > } > > somewhere in its internals (or maybe just using something else that does?). This isn't done directly in date-time. I'm guessing that it might have something to do with 'tokenizer' library which date-time uses for parsing. See boost/token_function.hpp for some ispunct magic that is likely at the root of this issue. HTH, Jeff

1 0

weak_ptr
by Jason Winnebeck 23 Jul '03

23 Jul '03

Is there a reason why weak_ptr's cannot be compared with ==, or tested in a conditional? If I have two weak_ptr's, I thought it to be strange that I have to do: (w1.lock() == w2.lock()) And to test if a weak_ptr is the empty weak_ptr: if ( !(w1.lock()) ) which seems kind of awkward. Looking at the implementation, I see how the copy constructor is defined using lock. I understand what the comments are saying there. Perhaps there are some multithreaded issues that prevent equality testing I don't see. I would like the semantics that w1 and w2 compare to be equal whether or not the object they are pointing to are valid or not. I'm not sure if weak_ptrs become "empty" when the object they point to is destroyed (because there's no way to test for "emptyness" or "nullness" of a weak_ptr), but if they do I can see how the equality test can't work, but not the conditional test. Even so, why is there not an operator == provided that locks both weak_ptr? Is it acceptable (the documentation didn't make it clear to me), to use if ( w1.expired() ) to test if simply if w1 is "null" or "reset". What I am trying to do is have a "current" pointer that takes the value of something I want to be set (or note the fact that nothing is set), but I don't care if the object dies while that pointer is set -- in fact I don't want to keep it alive because I don't have an easy way to call reset on current were I to make it a shared_ptr. Jason

2 3

date-time library and ispunct() ambiguity under MSVC6
by Carl Waldbieser 23 Jul '03

23 Jul '03

I get the following compilation error for this simple program under MSVC6: ************** test.cpp****************** #include <iostream> #include "boost/date_time/gregorian/gregorian.hpp" int main() { using namespace std; cout << ispunct(',') << endl; return 0; } ************************************ error: --------------------Configuration: names_test - Win32 Debug-------------------- Compiling... test.cpp c:\documents and settings\waldbcar.waldbcar\my documents\my projects\vc\test\names_test\test.cpp(8) : error C2668: 'ispunct' : ambiguous call to overloaded function Error executing cl.exe. test.obj - 1 error(s), 0 warning(s) Normally, this sort of thing would not be a problem, as I typically would just be using the qualified std::ispunct() instead of a using directive. However, this problem cropped up when I was trying to use the date-time library in conjuction with the Spirit parsing library. Spirit implements some function by doing exactly what I did in the above sample-- using a using directive and then calling ispunct() unqualified. I am guessing the ratonale behind this might have something to do with the fact that under MSVC6, functions like ispunct() (and most or all of <ccytpe>) seem to have been dumped into the global namespace by default. However, it seems like the date-time library must be doing something like: namespace std { using ::ispunct; } somewhere in its internals (or maybe just using something else that does?). Anyway, it seems to be a shame that I can't get these two great libraries to work together on my compiler. Is there any chance that someone out there might have a solution? Carl Waldbieser waldbie<at-sign>attglobal.net

1 0

boost::date_time + setting system clock
by ericd 22 Jul '03

22 Jul '03

afternoon all, I was wondering if it is possible to set the clock using date_time. I been looking but have found no clue that it is so. From what I have seen so far, this library does a lot of cool stuff, and why not this. I am working on a little personal project that uses an ORB. The idea is to have all clocks synchronized. I have one machine that queries an atomic time server. After having done so it will call each machine and synchronize them. I am currently running a mix of Linux, Solaris, WIN NT 2000 and XP... and it freaks me out not to have them synchronized. Any help would be appreciated... Eric

1 0

problem building boost on solaris
by jerry_karlin 22 Jul '03

22 Jul '03

gcc-Link-action libs/test/build/bin/libboost_prg_exec_monitor.so/g cc/debug/runtime-link-static/shared-linkable-true/ threading-single/libboost_prg_exec_monitor.so ld: warning: option -d appears more than once, first setting taken ld: fatal: option -dn and -z[text|textwarn|textoff] are incompatible ld: fatal: option -dn and -G are incompatible ld: fatal: Flags processing errors collect2: ld returned 1 exit status What's causing this, and how do I fix it? I can't figure my way through these jam files just yet... Sparc Solaris 2.7, gcc-2.95.3, binutils-2.14 Any help would be... helpful. Thanks!

3 2

Defect in intrusive_ptr.hpp
by Ilya Chvetsov(work) 22 Jul '03

22 Jul '03

Hi! It seems to me, that the following string should be inserted to intrusive_ptr.hpp <string> #include <boost/config.hpp> </string> Following code can not be compiled without this string under MSVC6SP5(with STLPort) <code> # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && __SGI_STL_PORT) // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL using std::basic_ostream; template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) # else template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) # endif { os << p.get(); return os; } </code> -Ilya

2 1

shared_ptr or weak_ptr in general
by Jason Winnebeck 22 Jul '03

22 Jul '03

I just wanted to follow up on my previous thread about my issues I've been discussing on the list with a general question. By default should I try to use shared_ptr or weak_ptr? I had always thought that shared_ptr should always be used except for rare cases where weak_ptr's semantics is either very desirable or needed. Now my pointers experience so far has been limited to explicit memory management (new/delete) and in Java with its references, where any reference keeps an object alive, and weak references exist but I've never used them despite a few years of using Java on the job. Based on some of the discussion (particularly from Mr Dimov), made me think that weak_ptr may be desirable a lot more often than I previously thought. I know that shared_ptr, unlike Java, is suceptable to cycles. And I feel that shared_ptr is better and less bug prone than new/delete but I'm afraid I'll have cycle problems if I just start throwing shared_ptr all over the place. I know that in my code I have back pointers all over the place, which I thought was pretty common, but I have realized that that only occurs when I'm following the generator/listener design scheme, and I've gotten that figured out. So A to B, B to A cycles don't concern me much but I do wonder about long cycles if I use shared_ptr a lot. The rule of thumb I'm using right now is to look for cycles if I "convert" a class to use shared_ptr (static crate method) that contains shared_ptr objects, similar to the rule I use to check for deadlocks with mutexes. But with all of these rules checking for safety I begin to question somewhat the benefits of shared_ptr over normal pointers. I suppose with shared_ptr you can only leak memory whereas with normal pointers you can do lots of nasty uninitialized accesses. I can see an argument that using shared_ptr only when needed and weak_ptr otherwise can help prevent cycles. But using weak_ptr requires the code to handle both cases of the lock operation, and I'm still unsure about any performance issues with lock if there is a mutex involved -- although too slight to not choose weak_ptr, it is enough to ask why not choose shared_ptr over weak_ptr if they both work equally well. Thank you for your comments and patience with my attemps at understanding, Jason Winnebeck

1 0

staticially linked STLport and Boost
by hh10k 20 Jul '03

20 Jul '03

I've compiled STLport for vc6, and can compile Boost with this: bjam "-sTOOLS=msvc-stlport" "-sBUILD=debug <stlport-iostream>on" So far so good, but when I try to compile a simple Boost.Python example (why I got Boost) I get a heap of link errors because Boost has linked with the DLL version of STLport, and I want it statically linked. I thought it's meant to default to static, but I can only guess that STLport is detecting otherwise. So, in order to force Boost to use the static verion, I tried: bjam "-sTOOLS=msvc-stlport" "-sBUILD=debug <stlport-iostream>on <define>_STLP_USE_STATIC_LIB" But now I get errors like: vc-Link libs\python\build\bin\boost_python.dll\msvc-stlport\debug\runtime-link-dynamic\stlport-cstd-namespace-std\stlport-iostream-on\stlport-version-4.5.3\boost_python_debug.dll libs\python\build\bin\boost_python.dll\msvc-stlport\debug\runtime-link-dynamic\stlport-cstd-namespace-std\stlport-iostream-on\stlport-version-4.5.3\boost_python_debug.lib msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::bad_alloc::bad_alloc(char const *)" (??0bad_alloc@std@@QAE@PBD@Z) already defined in stlport_vc6_stldebug_static.lib(dll_main.obj) LIBCMTD.lib(osfinfo.obj) : error LNK2005: __get_osfhandle already defined in MSVCRTD.lib(MSVCRTD.dll) LIBCMTD.lib(dbgheap.obj) : error LNK2005: _malloc already defined in MSVCRTD.lib(MSVCRTD.dll) ...lots more errors... This isn't just a problem with Boost.Python. Anything else that builds a dll or exe has the same errors. The first error seems really strange, because I can't understand how std::bad_alloc should exist in stlport_vc6_stldebug_static.lib(dll_main.obj). STLport does define it's own bad_alloc, but it also #defines std to _STL so there should be no 'std'. When I use bad_alloc in my own programs I don't have any problems, so I can only assume it's Boost. I've wasted so much time trying to work this out, but I don't know much about the Boost build process. What's going wrong?

3 3

Unusal regex behavior.
by sdf sdf 20 Jul '03

20 Jul '03

Hellos everyone! Here is a good one. I am using regex and am having some weird returns. I can assign my results to a std:vector <std:string>. The vector[0] does contain the correct match, but vector[1] does not contain what is in a set of parentheses as it should. In fact I usually get a segment fault when I try to access it. I then found I can access results from the grep by using the boost::Regex.What(n). However What(0) returns the next available match in the string, and What(1) and up will correctly report the substrings defined in this second match correctly. If no second match is available then the What() member will return the original match. How do I fix the vector problem? OR? Does using What() force another search to take place? And if so can I change that behavior? Code snippet: string reg_string ="[0-9]{3}(-[0-9]{2}-)[0-9]{4}"; //yes it is a SSN string search_string = "Big Bird \n123 sesame street \n the bronx NY 11722\n545-65-2343\nmorestuff\nandevenmore\nSnuff E Lufigous \n 234 sesame street \n the bronx NY 11722\n889-99-5527\nmorestuff\nandevenmore\n"; std::vector<std::string> results; boost::regex regsearch = boost::regex(reg_string,false); int num_matchs; num_matchs=regsearch.Grep(results, search_string, boost::match_any); cout << num_matchs << " Number of Matchs\n"; // this is 2 cout << results[0] << " results return string vector[0] \n"; // this is 545-65-2343 cout << regsearch.What(0) << " results from what(0) \n"; // this is 889-99-5527 cout << regsearch.What(1) << "results from what(1) \n";// this is -99- //this line aborts // cout << results[1] << " results return string vector[1] \n"; // this should be -65- HELP. Note I never ran the code above, but I think it is correct. __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

4 5

filesystem help
by Christian Gmeiner 20 Jul '03

20 Jul '03

Hello! This is my problem: I have an std::string contains something like C:\Test\Media\Cloud.dds. Now i want to extract the Cloud.dds. This is, what i have tried: fs::path temp(Name, fs::native); fs::directory_iterator dir_itr(temp); Name = dir_itr->leaf(); Where is my error? This code throughs an exception. Thanks, Christian Gmeiner

2 1

Multiple inheritance and enable_shared_from_this
by Jason Winnebeck 20 Jul '03

20 Jul '03

Can you multiply inherit from objects that inherit from enable_shared_from_this? It seems not. My program compiled on MSVC.NET "crashes" due to shared_from_this throwing boost::bad_weak_ptr. Originally when I started using shared_ptr I wanted to have an ability to obtain a shared_ptr to this since my objects sometimes register themselves. The way I do it now is like this: static sptr create() { sptr ret( new Object() ); ret->setThisPtr( ret ); return ret; } However it is very easy to forget which classes you inherit from that force you to call setThisPtr. A good use of the assert statement helps but I'd rather not do this. The problem is that I use multiple inheritance in one place: static sptr create() { sptr ret( new ComplexObject() ); ret->BaseA::setThisPtr( ret ); ret->BaseB::setThisPtr( ret ); return ret; } I thought I'd use enable_shared_from_this but as I said it crashes. The following program as tested on MSVC.NET throws boost::bad_weak_ptr then the line "Base2::sptr b2 = c->Base2::getThis();" is executed. #include <iostream> #include <boost/smart_ptr.hpp> #include <boost/enable_shared_from_this.hpp> using namespace std; template <class T> class SharedThis : public boost::enable_shared_from_this<T> { public: boost::shared_ptr<T> getThis() { return shared_from_this(); } }; class Base1 : public SharedThis<Base1> { public: typedef boost::shared_ptr<Base1> sptr; typedef boost::weak_ptr<Base1> wptr; protected: Base1() { cout << "Base1 ctor" << endl; } public: virtual ~Base1() { cout << "Base1 dtor" << endl; } static sptr create() { return sptr( new Base1() ); } private: Base1( const Base1& o ); Base1& operator = ( const Base1& rhs ); }; //Base2 is identical to Base1 except different name class Base2 : public SharedThis<Base2> { public: typedef boost::shared_ptr<Base2> sptr; typedef boost::weak_ptr<Base2> wptr; protected: Base2() { cout << "Base2 ctor" << endl; } public: virtual ~Base2() { cout << "Base2 dtor" << endl; } static sptr create() { return sptr( new Base2() ); } private: Base2( const Base2& o ); Base2& operator = ( const Base2& rhs ); }; class Child : public Base1, public Base2 { public: typedef boost::shared_ptr<Child> sptr; typedef boost::weak_ptr<Child> wptr; protected: Child() { cout << "Child ctor" << endl; } public: virtual ~Child() { cout << "Child dtor" << endl; } static sptr create() { return sptr( new Child() ); } }; int main( int argc, char* argv[] ) { Child::sptr c = Child::create(); Base1::sptr b1 = c->Base1::getThis(); Base2::sptr b2 = c->Base2::getThis(); /* assert( c.get() == c->Base1::getThis().get() ); assert( c.get() == c->Base2::getThis().get() ); assert( c == c->Base1::getThis() ); assert( c == c->Base2::getThis() ); */ }

3 8

signals through Python
by mat_2775 19 Jul '03

19 Jul '03

Hi, I'm very new to BOOST so please forgive my ignorance. I want to use the signals library of BOOST through Python. My question is whether that is actually possible and if so how? Kind regards Mat

2 1

Bind To Lambda
by Richard Crossley 18 Jul '03

18 Jul '03

Hi, I'm trying merge some code some of which uses a mixture of BB and BLL to just use the BLL under VC7.1. Having changed some 200 expressions without incident if find I can't see the wood for the trees here. The existing code, working with BB, is; typedef boost::function<void(ICollection*)> FECCFunc; void ForEachCollectionInChannels(IAmplifier* pIAmp,FECCFunc const & fec); typedef boost::function<void(IProperty*)> FEPFunc; void ForEachProperty(ICollection* pCollection,FEPFunc const & fep); void CalcPropCurValMaxWidth(IProperty* pProp,CColumnMap& map); ... void Problem() { CColumnMap m_ChanCols; IAmplifier* pIAmp; ForEachCollectionInChannels(pAmp,bind(ForEachProperty,_1,cref(bind(&CalcProp CurValMaxWidth,_1,ref(m_ChanCols)))); //Here } What's the equivalent with using BLL? Thanks, Richard.

1 1

StlPort-4.5.3, ublas and MSVC 6.0 problem
by Bosko Ivanisevic 18 Jul '03

18 Jul '03

Although I found on the site that UBLAS supportes MSVC 6.0 with STLPort I couldn't compile any example with this configuration. It seems that using Boost ublas library with StlPort (with native MS streams) and MSVC 6.0 have some problems and require specific settings. Does anyone have any hint how this problem can be solved? When I try to compile some of the samples from libs\numeric\ublas\doc \samples (for example vecto_binary.cpp) I got following errors: c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1534) : error C2027: use of undefined type 'const_iterator1' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1529) : see declaration of 'const_iterator1' c:\projects\test\boost_matrices\main.cpp(23) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::lower>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1831) : error C2027: use of undefined type 'iterator1' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1826) : see declaration of 'iterator1' c:\projects\test\boost_matrices\main.cpp(23) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::lower>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1950) : error C2027: use of undefined type 'const_iterator2' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1945) : see declaration of 'const_iterator2' c:\projects\test\boost_matrices\main.cpp(23) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::lower>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(2247) : error C2027: use of undefined type 'iterator2' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(2242) : see declaration of 'iterator2' c:\projects\test\boost_matrices\main.cpp(23) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::lower>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1534) : error C2027: use of undefined type 'const_iterator1' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1529) : see declaration of 'const_iterator1' c:\projects\test\boost_matrices\main.cpp(30) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::upper>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1831) : error C2027: use of undefined type 'iterator1' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1826) : see declaration of 'iterator1' c:\projects\test\boost_matrices\main.cpp(30) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::upper>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1950) : error C2027: use of undefined type 'const_iterator2' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(1945) : see declaration of 'const_iterator2' c:\projects\test\boost_matrices\main.cpp(30) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::upper>' being compiled c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(2247) : error C2027: use of undefined type 'iterator2' c:\programming\boost_1_30_0\boost\numeric\ublas\hermitian.hpp(2242) : see declaration of 'iterator2' c:\projects\test\boost_matrices\main.cpp(30) : see reference to class template instantiation 'boost::numeric::ublas::hermitian_adaptor <class boost::numeric::ublas::matrix<class std::complex<double>,struct boost::numeric::ublas::row_major,cla ss boost::numeric::ublas::unbounded_array<class std::complex<double> > >,struct boost::numeric::ublas::upper>' being compiled c:\projects\test\boost_matrices\main.cpp(37) : warning C4508: 'main' : function should return a value; 'void' return type assumed Error executing cl.exe. Does anyone have any hint how this problem could be solved?

1 0

boost and Watcom
by filbico 18 Jul '03

18 Jul '03

Hello, I would like to use boost 1.29 under Watcom C++ complier (11.0C, Powersoft Optima 2.1). I am looking for configuration files. Robert Nowak.

1 0

Replace/Extend default execution_monitor
by aragorn_yes 18 Jul '03

18 Jul '03

Hi all, What is the best way to replace/extend the default execution_monitor (unit_test_monitor) in the test library. Thanks in advance. Manuel.

2 1

Known limitations of Boost threads across O/S platforms???
by Louis Caston 17 Jul '03

17 Jul '03

Are there any known limitations to Boost threads across Win, Solaris, and Linux? I'm in a planning cycle, and expect to be utilizing Boost as much as possible. Thanks, - Louis

2 2

indirect_iterator_generator<list<shared_ptr<X> >::iterator> again
by Raoul Gough 17 Jul '03

17 Jul '03

Using gcc 3.2 (on MinGW) the template parameter defaults for indirect_iterator_generator don't work with shared_ptr. This has been discussed* on the list before, but there doesn't seem to have been a user-friendly resolution to the issues involved (at least not in release 1_30_0). Using my compiler, the current situation requires the client code to supply all five of the template parameters. *some previous threads on the subject: http://groups.yahoo.com/group/Boost-Users/message/1618 http://lists.boost.org/MailArchives/boost/msg33273.php http://lists.boost.org/MailArchives/boost/msg33316.php My sample code: #include <boost/iterator_adaptors.hpp> #include <boost/shared_ptr.hpp> #include <list> int main () { typedef std::list<boost::shared_ptr<int> > ListType; typedef ListType::iterator BaseIterator; typedef boost::indirect_iterator_generator<BaseIterator>::type Adapter; } Error output: f:/mingw/include/c++/3.2/bits/stl_iterator_base_types.h: In instantiation of `std::iterator_traits<boost::shared_ptr<int> >': d:/CVS/boost/boost/boost/iterator_adaptors.hpp:1111: instantiated from `boost::detail::iterator_traits<boost::shared_ptr<int> >' d:/CVS/boost/boost/boost/iterator_adaptors.hpp:1111: instantiated from `boost::detail::traits_of_value_type<main()::BaseIterator>' iterator_adapter.cc:9: instantiated from here f:/mingw/include/c++/3.2/bits/stl_iterator_base_types.h:123: no type named ` iterator_category' in `class boost::shared_ptr<int>' f:/mingw/include/c++/3.2/bits/stl_iterator_base_types.h:125: no type named ` difference_type' in `class boost::shared_ptr<int>' Looking at iterator_adaptors.hpp:1111 we have (reformatted): struct traits_of_value_type { typedef typename boost::detail::iterator_traits<T>::value_type outer_value; typedef typename boost::detail::iterator_traits<outer_value>::value_type value_type; typedef typename boost::detail::iterator_traits<outer_value>::reference reference; typedef typename boost::detail::iterator_traits<outer_value>::pointer pointer; }; So traits_of_value_type tries to look up the *iterator_traits* of the *value type* for the supplied iterator. Does the value type really need to have complete iterator traits for the compiler to figure out the defaults here? Is anybody working on improving the ease-of-use for indirect_iterator_generator? -- Raoul Gough "Let there be one measure for wine throughout our kingdom, and one measure for ale, and one measure for corn" - Magna Carta

3 10

Preventing Cycles with shared_ptr
by Jason Winnebeck 17 Jul '03

17 Jul '03

Hello everyone, I am new to this list and a little new to Boost. I have a question on program design when using the excellent boost shared pointer's library. I am converting my old network library that uses explicit memory management to use shared_ptr where appropriate. So far this has gone well but I am having problem with cycles. This post is more of request for comments on my thought process, and if there is a "traditional" or better way of handling these issues. The question in general is "How to deal with the cycles that come about from event generator/listener designs?" The problem in more specific terms with my thinking follows. I'm having a problem with trying to mitigate reference cycles in a event generator/event listener paradigm. One creates a listener object, and registers itself as a listener of that object. As a result of the event, it may want to invoke methods of that object, so it contains a reference to that object. So Generator contains a reference to Listener, and Listener contains a reference to Generator. This is a problem with reference counted pointers. People tell me that cycles in general signify a flaw, so perhaps my fundamental design is indeed flawed. A real example from my library is a Connection object representing a network connection. Library user derives a new class implementing the ConnectionListener interface and registers it with Connection. When a packet arrives an event in the listener is invoked, and let's say the listener wants to process the packet and send a packet in response. It does this by passing a packet to the Connection. Thus the Connection refers to the listener, and the listener refers to the Connection (to send a packet). There are some possible solutions. One way to break cycles is to use weak references. In this way you can observe an object without preventing it from being collected. In the general case, cycles are very bad because you aren't sure which object can be deleted when. However in this case the relationship is simple. Generator can only generate events when it is alive, and Listener will only try to interact with Generator as a response to its event (so we know Generator is alive if we got its event). One could use a weak pointer in the Generator to the Listener, but then the Listener may die as soon as it is registered. The Listener can use a weak pointer to the Generator, and this seems intuitive since the Listener is merely an observer, but accessing a weak pointer safely in a multithreaded environment is expensive (I think so?) when we are positive it exists. The issue is compounded in my library since Generator is an object that I have written (therefore I can trust it to understand all of my "choices"), while the Listener is defined by the user. So I prefer to make the task as easy as possible on the user -- so I want to allow the user to use weak or strong references if possible so he doesn't have to worry about cycles. If I must impose a restriction along the lines of "you can have a pointer to object type x", I will, but I much prefer to not have restrictions like that. One way I've been considering (and have implemented some already) is to have the Generator release all its Listeners when it is done generating events. This works, but in my old API I have ways to retrieve the set listener, and this cannot work since the set listener may go to NULL at any time (as a weak pointer). So my best option for now seems to be to break my old API by allowing the user to set listeners and objects but not be able to retrieve them back (or allow retrieve function knowing that an empty shared_ptr may be returned). Another possible way is for the Generator always to pass a reference to itself in the event. This is possible and clean and very fast, but requires major changes to my API, but the prior way of disallowing gets is safe in that it allows the user to not have to think twice about keeping a reference to my object. I have more ideas but this post is getting long. If you have comments about how something like this using shared_ptr is typically designed, or comments related to my more specific problem, I would be grateful. Thanks in advance, Jason Winnebeck

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RE: [Boost-Users] Preventing Cycles with shared_ptr
by Jim.Hyslop 17 Jul '03

17 Jul '03

Jason Winnebeck wrote: > I am converting my old network library that uses explicit memory > management to use shared_ptr where appropriate. So far this has gone > well but I am having problem with cycles. [...] > One could use a weak pointer in the Generator to the > Listener, but then > the Listener may die as soon as it is registered. That's OK, though - each time the Generator wants to use the Listener, it constructs a shared_ptr out of the weak_ptr it has. If the shared_ptr is NULL, the Generator knows the Listener has gone away, and can take the appropriate steps to unregister the Listener. > ... the Listener is defined by the user. So I prefer to > make the task as easy as possible on the user -- so I want to > allow the > user to use weak or strong references if possible so he > doesn't have to > worry about cycles. If you want to make things easy for the user, don't offer them a choice. Choice means complexity. Complexity is bad. Require the user to use a shared_ptr to the Generator. -- Jim

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RE: [Boost-Users] vc6 stl's problem
by Jim.Hyslop 17 Jul '03

17 Jul '03

hlh771 wrot: > the stl's implementation of vc6 is buggy such as auto_ptr,xtree etc, > even if it is patched with sp5 The Service Packs do not include changes to the STL headers. The STL was provided by a third party, Dinkumware, which for a few years was unable to provide updates to Microsoft due to legal difficulties between Dinkumware and another party. You can find patches and fixes at Dinkumware's web site: http://www.dinkumware.com/vc_fixes.html -- Jim

2 1

how to empty a graph?
by Jeremie 17 Jul '03

17 Jul '03

Hello guys, I'm a newbie with boost and I need to empty a Mutable graph in the program I'm doing. is ther another method as remove_edge? /Jérémie

2 1

regex RegEx::Grep on Windows [callback problems with bind1st(mem_fun(callback))]
by Eric Brown (Propel) 16 Jul '03

16 Jul '03

I'm trying to use RegEx::Grep(GrepCallback cb, ...) on Windows with VC6. It works great with one exception. I really need the callback to be a method so that I can update attributes in my instance. I've tried about 10 ways and can't get anywhere - VC6 keeps sending back errors. Some of the errors are obvious and some - well, aren't templates wonderful whe it comes to error msgs?!@#$% I'm using MS stl and the example in the docs to get a generic function pointer doesn't work. This is the example in the regex docs: std::bind1st(std::mem_fun(&MyClass::callback), this) Then I tried: boost::bind(&MyClass::callback, this, _1) This simply produces a type that refuses to match GrepCallback. I wish the RegEx code just overloaded RegEx::Grep() to support this. (Is it more crossplatform and the STL way to do things?) I tried several other things including direct casts to GerpCallback, but I'm stuck. Any help in this area would be great. Thanks, Eric

3 2

Standardization of build
by Johannes Strömberg 16 Jul '03

16 Jul '03

Hi, I noticed that the build of some projects (filesystem, date_time, signals) differs from the build of the thread, regex and python libraries in that they they do not include a bin-stage and that debug and release versions have the same name. It would be nice if this could be standardized somehow (especially that debug and release versions should have different names). /Johannes

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Re: [Boost-Users] Re: Is vc7 test unresolved external cpp_main still a problem?
by dick.bridges＠tais.com 16 Jul '03

16 Jul '03

I guess I must have missed those missives. I used <query>boost vc7 test "unresolved external" "cpp_main"</query> to query Google and, as I indicated, only found entrys from last February and none of them contained your nai as the sender. My query was apparently deficient in some manner. Which "FAQ section" mentions it? I tried (and just now reviewed) http://www.boost.org/more/faq.htm but didn't see anything that seemed to cover relevant changes since last February. In any case, my apologies for having not been more diligent. I guess I can assume from the referenced repetitions that the answers to my questions are: 1) no, you didn't miss an update; and 2) yes, it's still expected behavior when using the Jamfile included in the boost_1_30_0.zip currently on SourceForge. Thanks for your time and the clarification. "Gennadiy E. Rozental" To: Boost-Users(a)yahoogroups.com <rogeeff(a)mail.co cc: m> Subject: [Boost-Users] Re: Is vc7 test unresolved external cpp_main still a problem? 07/15/2003 07:33 PM Please respond to Boost-Users > libs\date_time\build\bin\boost_date_time.dll\vc7\debug\runtime- link-dynamic\boost_date_time.dll As I keep repeating DLL version of Boost.Test components is not available for NT platform at the moment. It's already fixed in Jamfile and mentioned in FAQ section. Use static linking instead. Gennadiy. Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

1 0

vc6 stl's problem
by hlh771 16 Jul '03

16 Jul '03

the stl's implementation of vc6 is buggy such as auto_ptr,xtree etc, even if it is patched with sp5, my question is: If I use the vc6's stl to build the boost library,is the boost library also buggy?If no, how boost library handle it? If I fix some stl's source files of vc6, will it affect boost?

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RE: [Boost-Users] Re: Using date_time::microsec_clock in windows ?
by Jim.Hyslop 16 Jul '03

16 Jul '03

Russell Hind wrote: > We discussed this a few months back. I _thought_ the discussion sounded familiar ;=) -- Jim

1 0

bad/missing pictures in graph docs
by Ded Panas 16 Jul '03

16 Jul '03

Hello, group I'm studying the graph library now and found that some pictures in the documentation are bad, and some are missing: referenced from boost\libs\graph\doc\adjacency_list.html: adj-matrix-graph2.gif (bad) undir-adj-matrix-graph2.gif (missing) undir-adj-list2.gif (missing) referenced from boost\libs\graph\doc\adjacency_matrix.html: adj-matrix2.gif (missing) referenced from boost\libs\graph\doc\subgraph.html: subgraph.gif (bad) May be it is possible to fix it? DedPanas

1 0

smart pointer test failed
by hlh771 16 Jul '03

16 Jul '03

hello,everybody I want to test smart pointer library,but got some compile failure: vc- C++ ..\..\..\libs\smart_ptr\test\bin\shared_ptr_alloc_test.test\msvc\d ebug\runtime-link-dynamic\shared_ptr_alloc_test.obj shared_ptr_alloc_test.cpp M:\develop\boost_1_30_0\boost/detail/quick_allocator.hpp(165) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information "cl" /Zm800 -nologo -GX -c /Z7 /Od /Ob0 /GX /GR /MDd - I"..\..\..\libs\smart_ptr\test" -I"M:\develop\boost_1_30_0" - I"D:\PROGRA~1\MICROS~1\VC98\include" - Fo"..\..\..\libs\smart_ptr\test\bin\shared_ptr_alloc_test.test\msvc\de bug\runtime-link-dynamic\shared_ptr_alloc_test.obj" - Tp"shared_ptr_alloc_test.cpp" ...failed vc- C++ ..\..\..\libs\smart_ptr\test\bin\shared_ptr_alloc_test.test\msvc\d ebug\runtime-link-dynamic\shared_ptr_alloc_test.obj... ...skipped <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.CMD for lack of <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.obj... ...skipped <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.exe for lack of <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.CMD... ...skipped <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.run for lack of <libs!smart_ptr! test\shared_ptr_alloc_test.test\msvc\debug\runtime-link- dynamic>shared_ptr_alloc_test.exe... ...failed updating 1 target... ...skipped 4 targets... ...updated 1 target... my test command is:bjam -sTOOLS=msvc test my compiler is vc6+sp5 It's seems like the compiler's error,but because the test's failure, I'm not sure it will work correctly if use it in my app. Thanks in advance.

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Need Help (Spirit)!!!
by monaabs 16 Jul '03

16 Jul '03

Greetings !!! I need to use spirit to port existing yacc graamar that i have for parsing sql and its subselects. Can anybody please let me know if there is a parser for parsing SQL using spirit . I need to parse Japanese characters . I have looked at ANTLR and Spirit seems very reliable and easy . Plus ANTLR has no support for parsing MBCS characters for C++ :( Can anybody please send me a sample file (if possible) Any input greatly appreciated . Mona

2 1

RE: [Boost-Users] Using date_time::microsec_clock in windows ?
by Jim.Hyslop 16 Jul '03

16 Jul '03

Jérôme Poulin wrote: > How do you > guys suggest to emulate the microsec_clock on a Windows compilation ? I don't know how the boost developers are planning on it, but the NTP (Network Time Protocol) uses the high performance counter functions (QueryHighPerformanceCounter and QueryHighPerformanceFrequency, IIRC) and interpolates based on that. -- Jim

2 1

RE: [Boost-Users] Using date_time::microsec_clock in windows ?
by Jim.Hyslop 16 Jul '03

16 Jul '03

Jeff Garland wrote: > It actually shouldn't be too hard. It is really a matter of > swapping out the > Windows API function calls to return the times and then adjusting > appropriately. (follow-ups should probably be diverted to the Boost developers list) I'm not sure if this has been discussed or not, but it may be harder than you imagine. The Windows API functions dealing with time have a resolution of approximately 10 milliseconds. Even the functions that return values of hectonanoseconds (100 nanoseconds) are limited to this resolution. To see what I mean, run this program: #include <windows.h> #include <iostream> #include <map> const int numElements=10000; DWORD WINAPI timeThread(void *) { // Step 1: fill in an array of FILETIME elements with the time // returned by GetSystemTimeAsFileTime. Make sure each element // is unique - don't increment index until the time we just read // is actually different from the last time we read. FILETIME ft[numElements]; memset(&ft[0], 0, sizeof(ft)); GetSystemTimeAsFileTime(&ft[0]); int index=1; while (index < numElements) { GetSystemTimeAsFileTime(&ft[index]); if (ft[index].dwLowDateTime != ft[index-1].dwLowDateTime) index++; } // Step 2: calculate the delta from one timestamp to the next. Store // this delta in a map<int, int> where the key is the delta, and the value // is the number of times that delta appears. For example, with the timestamps: // 0, 5, 11, 16, 21, 25 // we get the deltas: // 5, 6, 5, 5, 4 // the map will contain three entries: pair(4, 1 ), pair( 5, 3 ), pair( 6, 1 ) unsigned smallestDiff=(unsigned)-1, largestDiff=0; ULARGE_INTEGER endTime; ULARGE_INTEGER startTime; startTime.LowPart = ft[0].dwLowDateTime; startTime.HighPart = ft[0].dwHighDateTime; std::map<int, int> distribution; for (index=1; index<numElements; ++index) { endTime.LowPart = ft[index].dwLowDateTime; endTime.HighPart = ft[index].dwHighDateTime; unsigned difference = endTime.QuadPart - startTime.QuadPart; std::cout << difference << "\n"; if (difference < smallestDiff) smallestDiff = difference; if (difference > largestDiff) largestDiff = difference; startTime = endTime; distribution[difference]++; } // step 3: dump the stats. endTime.LowPart = ft[numElements-1].dwLowDateTime; endTime.HighPart = ft[numElements-1].dwHighDateTime; startTime.LowPart = ft[0].dwLowDateTime; startTime.HighPart = ft[0].dwHighDateTime; std::cout << numElements << " samples. Smallest delta: " << smallestDiff/10000.0 << "ms; Largest delta: " << largestDiff/10000.0 << "ms; Average: " << unsigned long (endTime.QuadPart - startTime.QuadPart) / (numElements * 10000.0) << "ms\nDistribution:" << std::endl; for (std::map<int, int>::iterator i = distribution.begin(); i != distribution.end(); ++i) { std::cout << (*i).first << ": " << (*i).second << "\n"; } return 0; } int main() { std::cout << "Note: this program will run for approximately " << numElements/100 << " seconds\nwith no output, at real-time priority. \n" "Your system may appear to hang while this program is running.\n" "Rest assured it *will* terminate." << std::endl; HANDLE threadHandle = CreateThread(NULL, 0, timeThread, 0, CREATE_SUSPENDED, 0); SetThreadPriority(threadHandle, THREAD_PRIORITY_TIME_CRITICAL); ResumeThread(threadHandle); WaitForSingleObject(threadHandle, -1); } When I ran it on NT4 SP6, the distribution was as follows: 100136: 7614 100137: 2359 200272: 1 500680: 17 500685: 7 600822: 1 (the units are hectonanoseconds, divide by 10 to get microseconds). I'm guessing the 50 and 60 ms timings are related to task switching or other O/S overhead. On a machine running Windows 2000 SP 3, the results were: 100144: 9999 -- Jim

2 1

Help with boost functional
by Carl Waldbieser 16 Jul '03

16 Jul '03

The following code produces errors when compiled on MSVC6: ************* Start test.cpp ************************ #include <iostream> #include "boost/functional.hpp" struct Foo { int operator()(int x) const {return x+1;} }; typedef class boost::const_mem_fun1_t<int,struct Foo,int> FType; int main() { Foo foo; std::cout << foo(1) << "\n"; //This works //std::cout << boost::bind2nd<FType>(boost::mem_fun(&Foo::operator ()), 7)(&foo) << "\n"; //This does not. std::cout << boost::bind2nd(boost::mem_fun(&Foo::operator ()), 7)(&foo) << "\n"; return 0; } ****************** end test.cpp ******************* The error is as follows: --------------------Configuration: mem_fun_test - Win32 Debug-------------------- Compiling... test.cpp C:\Documents and Settings\waldbcar.WALDBCAR\My Documents\My Projects\VC\test\mem_fun_test\test.cpp(20) : error C2782: 'class boost::binder2nd<Operation> __cdecl boost::bind2nd(Operation &,const Operation &)' : template parameter 'Operation' is ambig uous could be 'int' or 'class boost::const_mem_fun1_t<int,struct Foo,int>' C:\Documents and Settings\waldbcar.WALDBCAR\My Documents\My Projects\VC\test\mem_fun_test\test.cpp(20) : error C2782: 'class boost::binder2nd<Operation> __cdecl boost::bind2nd(const Operation &,const Operation &)' : template parameter 'Operation' is ambiguous could be 'int' or 'class boost::const_mem_fun1_t<int,struct Foo,int>' Error executing cl.exe. test.obj - 2 error(s), 0 warning(s) I am just not seeing where the ambiguity is coming from. The commented out line will actually compile and run as I expected, but I can't figure out why the compiler can't deduce the template argument. Any ideas? Thanks in Advance! Carl Waldbieser waldbie[at-sign-here]attglobal.net

2 1

libbgl-viz.a instead of libbglviz.a
by dhofstee 16 Jul '03

16 Jul '03

Hi, I'm quite new at using boost (downloaded 1.30.0 a couple of days ago). I noticed that when I wanted to make libbglviz.a, as described in http://www.boost.org/libs/graph/doc/read-graphviz.html, there was already a makefile. "make libbglviz.a" does not work, but "make libbgl-viz.a" will. A second documentation error is in http://www.boost.org/libs/property_map/property_map.html, where the example is not equal to the actual cpp file. generic_foo_algorithm is on this page, but the file just mentions foo. I think it is a glitch in the doc, but if different... Comments?, David NL

2 1

Is vc7 test unresolved external cpp_main still a problem?
by dick.bridges＠tais.com 16 Jul '03

16 Jul '03

The last reference to this failure I found in the archive was from Feb 19th. I got boost_1_30_0.zip from SourceForge yesterday. Have I missed an update to something somewhere? TIA <bjam log> ...found 2392 targets... ...updating 28 targets... FileClone libs\regex\build\bin-stage\boost_regex_debug.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex_debug.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex.lib 1 file(s) copied. vc-Link libs\date_time\build\bin\boost_date_time.dll\vc7\debug\runtime-link-dynamic\boost_date_time.dll libs\date_time\build\bin\boost_date_time.dll\vc7\debug\runtime-link-dynamic\boost_date_time.lib vc-Link libs\date_time\build\bin\boost_date_time.dll\vc7\release\runtime-link-dynamic\boost_date_time.dll libs\date_time\build\bin\boost_date_time.dll\vc7\release\runtime-link-dynamic\boost_date_time.lib LINK : warning LNK4089: all references to 'MSVCP71.dll' discarded by /OPT:REF vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib cpp_main.obj : error LNK2019: unresolved external symbol "int __cdecl cpp_main(int,char * * const)" (?cpp_main@@YAHHQAPAD@Z) referenced in function "public: virtual int __thiscall `anonymous namespace'::cpp_main_caller::function(void)" (?function@cpp_main_caller@?A0xe9549083@@UAEHXZ) libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll : fatal error LNK1120: 1 unresolved externals "link" /nologo /INCREMENTAL:NO /DEBUG /DLL /subsystem:console /out:"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll" /IMPLIB:"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib" /LIBPATH:"C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\lib" @"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.CMD" ...failed vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib... ...skipped <libs!test!build\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single>boost_prg_exec_monitor.dll for lack of <libs!test!build\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single>boost_prg_exec_monitor.lib... vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.lib cpp_main.obj : error LNK2019: unresolved external symbol "int __cdecl cpp_main(int,char * * const)" (?cpp_main@@YAHHQAPAD@Z) referenced in function "public: virtual int __thiscall `anonymous namespace'::cpp_main_caller::function(void)" (?function@cpp_main_caller@?A0xe9549083@@UAEHXZ) libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.dll : fatal error LNK1120: 1 unresolved externals <snip> ...failed updating 12 targets... ...skipped 12 targets... ...updated 4 targets... </bjam log>

3 2

Using date_time::microsec_clock in windows ?
by J�r�me Poulin 15 Jul '03

15 Jul '03

Hi, I would like to know why we can't use the microsec_clock in a windows env. I know there is no gettimeofday function, but there is certainly a viable workaround. Why it isn't in boost yet, is it planned ? How do you guys suggest to emulate the microsec_clock on a Windows compilation ? Thanks. Jérôme

2 1

profiling ublas code
by cerenoc 15 Jul '03

15 Jul '03

Hi, I am trying to optimize my ublas-containing code. The profile from gprof showed these two functions as the top 2 time-consuming ones. Could somebody explain to me a little bit about what these mean? % cumulative self self total time seconds seconds calls ms/call ms/call name 23.76 93.11 93.11 137604968 0.00 0.00 vector<int, allocator<int> > * __uninitialized_copy_aux<vector<int, allocator<int> > *, vector<int, allocator<int> > *>(vector<int, allocator<int> > *, vector<int, allocator<int> > *, vector<int, allocator<int> > *, __false_type) 21.49 177.31 84.20 41208000 0.00 0.00 vector<int, allocator<int> >::operator=(vector<int, allocator<int> > const &) Thanks, Julian

2 1

Assertion tripped in boost::uniform_int
by mvogt＠juptech.com 15 Jul '03

15 Jul '03

Hello. I just experienced an assertion failure using the boost::minstd_rand generator: /home/packages/boost_1_29_0/boost/random/uniform_int.hpp:50: boost::uniform_int<UniformRandomNumberGenerator, IntType>::uniform_int (UniformRandomNumberGenerator &, IntType, IntType) [with UniformRandomNumberGenerator = boost::random::linear_congruential<int32_t, 48271, 0, 2147483647, 399268537>, IntType = int]: Assertion `min < max' failed. I use the following code to generate random numbers: typedef boost::minstd_rand RngType; extern RngType pseudo_rng; template <class T> T random(T min, T max) { boost::random_number_generator<RngType, T> rng(pseudo_rng); return rng(max - min + 1) + min; } Am I doing something wrong, or is there a fault in the uniform_int algorithm? Thanks, Matt. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify mail.administrator(a)jupiters.com.au ********************************************************************** [Non-text portions of this message have been removed]

4 4

Spirit v1.7.0 and v1.6.1 Released
by Joel de Guzman 13 Jul '03

13 Jul '03

Hello, Spirit v1.7.0 and v1.6.1 have been released. Get it here: Spirit v1.7.0: http://tinyurl.com/gssn Spirit v1.6.1: http://tinyurl.com/gsss Take note that by convention, odd minor version releases (e.g. 1.7.0) are developmental while even minor version releases (e.g. 1.6.1) are stable. What's new: http://spirit.sourceforge.net/distrib/change_log.html Have fun!!! Cheers, -- Joel de Guzman joel at boost-consulting.com http://www.boost-consulting.com http://spirit.sf.net

1 0

Logging library ?
by drkm 13 Jul '03

13 Jul '03

Hello. Is there any logging fonctionality in the Boost libraries ? I found nothing. If there is nothing, is there a plan to add a such library to Boost ? --drkm

2 1

MPL::lambda issue: what am I doing wrong?
by Brian Simpson 11 Jul '03

11 Jul '03

I want to express a "type-mapping" scheme. My implementation idea is this: have the user define an MPL sequence comprised exclusively of std::pair derivations. He can then instantiate my template class with his sequence as the argument. My template then derives two MPL sequences, one containing the "first" types, the other containing the "second" types. Here is the attempt: <code> namespace ls { using namespace boost::mpl; using namespace placeholders; template <class TypePairSequence> struct list_splitter { template <class STDPAIR> struct first_type { typedef typename STDPAIR::first_type type; }; template <class STDPAIR> struct second_type { typedef typename STDPAIR::second_type type; }; typedef typename transform < TypePairSequence , first_type<_1> > ::type first_types; typedef typename transform < TypePairSequence , second_type<_1> >::type second_types; }; }//end namespace ls </code> Here is an attempt to instantiate: 1> typedef boost::mpl::list< std::pair<long, short>, std::pair<char, double> > associated_types; 2> typedef ls::list_splitter<associated_types> split_associated_types; 3> typedef split_associated_types::first_types first_types; 4> typedef split_associated_types::second_types second_types; 5> typedef boost::mpl::at_c<first_types, 0>::type first_first_t; Code lines 1-2 compile fine. When I add line 3, I get the following error: "no type named `first_type' in `struct boost::mpl::arg<1>'". If you need more: <error> temp.h: In instantiation of `ls::list_splitter<associated_types>::first_type<boost::mpl::arg<1> >': boost/mpl/transform.hpp:41: instantiated from `boost::mpl::apply1<ls::list_splitter<associated_types>::first_type<boost::m pl::arg<1> >, std::pair<char, double> >' boost/mpl/transform.hpp:41: instantiated from `boost::mpl::aux::transform_op<ls::list_splitter<associated_types>::first_ty pe<boost::mpl::arg<1> > >::apply<boost::mpl::null_node, std::pair<char, double> >' boost/mpl/aux_/preprocessed/gcc/fold_backward_impl.hpp:74: instantiated from `boost::mpl::aux::fold_backward_impl<2, boost::mpl::list_iterator<boost::mpl::list2<std::pair<long int, short int>, std::pair<char, double> > >, boost::mpl::list_iterator<boost::mpl::null_node>, boost::mpl::null_node, boost::mpl::protect<boost::mpl::aux::transform_op<ls::list_splitter<associat ed_types>::first_type<boost::mpl::arg<1> > > >, boost::mpl::arg<1> >' boost/mpl/fold_backward.hpp:45: instantiated from `boost::mpl::fold_backward<associated_types, boost::mpl::null_node, boost::mpl::protect<boost::mpl::aux::transform_op<ls::list_splitter<associat ed_types>::first_type<boost::mpl::arg<1> > > >, boost::mpl::arg<1> >' boost/mpl/transform.hpp:64: instantiated from `boost::mpl::algo_::transform<associated_types, ls::list_splitter<associated_types>::first_type<boost::mpl::arg<1> > >' temp.h:35: instantiated from `ls::list_splitter<associated_types>' temp.h:53: instantiated from here temp.h:19: no type named `first_type' in `struct boost::mpl::arg<1>' </error> I'm sure I'm overlooking something simple. Could someone point me in the right direction? I'm using gcc3.2.2 on Solaris 9. TIA, Brian

2 4

Defining tuples and variants based on mpl::sequences
by Brian Simpson 11 Jul '03

11 Jul '03

Here is the problem: A tuple or variant needs to be defined, whose types are derived from an mpl::list (or other model of MPL Sequence). How is it to be done? I have considered that I might be able to define the tuple/variant with the types and then generate the sequence from there, but that still leaves me wondering how to define another tuple/variant with a sub- or super-set of the types in the generated sequence. Consider that I am supplied with a sequence of types, and that I want to define either 1)a tuple of pointers to them, or 2)a variant based on those types as well as pointers to them. I have considered that it would be a good thing to provide sequence-based tuples/variants and still provide the current variadic template (<--is that the correct term?) versions--which could be implemented in terms of the sequence-based ones (in my uneducated opinion). But I wonder if there is another solution already available which I have not considered. TIA for your consideration, Brian

1 0

Boost.Python interface to Boost Graph Library (BGL)
by BP 11 Jul '03

11 Jul '03

I would like to use the Boost Graph Library (BGL), but I'm not much of a C++ programmer. I'd feel much more comfortable working in Python. Can I download the Boost Graph Library wrapped in Boost.Python? I'd rather not wrap myself if it already exists. Thanks. - BP __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

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templated 'handle' in pimpl code? (Slightly off topic)
by Kevin Wheatley 11 Jul '03

11 Jul '03

Hi, I wondered if there are any examples of a templated handle class within the boost code base I could look at? I'm trying to hide both the implementation of the body class and that of the template type, something like that below but my compiler is complaining about partial specialization in the declaration of the implementation class in handle.cpp I know its not strictly boost related, but I don't get any of the comp.lang.* groups. Also before anybody suggests I should be using a smart pointer for the impl variable I'd like to avoid having to introduce the boost library to the user of the two .h files. My goal was that the users would only need the *.h files and I could provide fred.o fred2.o fred3.o etc. as new options for "fred" come along. I know that using the template doesn't appear to be getting me anywhere towads my original goal (generally needing the implementation to get the templated code to work!) but I'd like to see if I could at least get the code to compile by studying anything similar as it may have some use in other areas. Thanks Kevin // -------------- fred.h class fred { public: void somefunction(); }; // -------------- handle.h template <typename T> class handle { public: handle(); ~handle(); void callsomefunctionviaimpl(); private: template <typename U> class handleimpl; handleimpl<T> *impl; }; // -------------- fred.cpp #include <iostream> using namespace std; #include "fred.h" void fred::somefunction() { cout << "fred::somefunction()" << endl; } // -------------- handle.cpp #include <iostream> using namespace std; #include "handle.h" template <class T, class U> class handle<T>::handleimpl<U> { public: void implfunctiononfred() { myfred.somefunction(); } private: static T myfred; }; template <class T> handle<T>::handle() : impl(new handle<T>::handleimpl<T>) { } template <class T> handle<T>::~handle() { delete impl; } template <class T> void handle<T>::callsomefunctionviaimpl() { cout << "handle calling" << endl; impl->implfunctiononfred(); } // ----------- Main code ---------------- #include "fred.h" #include "handle.h" int main(int argc, char** argv) { handle<fred> foo; foo.callsomefunctionviaimpl(); return 0; } -- | Kevin Wheatley | These are the opinions of | | Senior Do-er of Technical Things | nobody and are not shared | | Cinesite (Europe) Ltd | by my employers |

1 1

multi-array versus valarray
by lformaggia 11 Jul '03

11 Jul '03

Hi, I am a new user of boost and I am interest in the multi-array library. However it is not clear to me which are the advantages versus the std::valarray and std::slice classes. There are quite a few numeric functions provided by C++ that work on valarrays (the pow() for example), is there any equivalent for multi-arrays )it would be very nice to have a norm() function at least for two-dimensional arrays!) or you have to write your own. Sorry if this question may seem trivial, yet I have to choose which basic multiarray classes to implemet for my code (it is numerical code based on the finite element method) and so far my choice is between multi-array or valarray + slice. Maybe somebody of you have some experience on this matter and my help in taking an appropriate decision. Thank you Luca

1 0

Having problems with boost::signal and boost::function
by subsample 11 Jul '03

11 Jul '03

I'm having a problem (which was really hard to decipher) when connecting a function object to a signal. Thing is I default construct (no argument) a function object and connect it to the signal (using boost::ref), then at a later point in time I actually assign something to the function object (using boost::bind). But firing the signal after this causes a bad_function_call to be thrown. On the other hand; if I construct the function object with some dummy object before connecting it to the signal, and later do the assignment, the signal does its thing. If someone could enlighten me as to whats going on here, I'd be grateful .. : )

2 1

Signals library safety
by Eugene Talagrand 11 Jul '03

11 Jul '03

Hello to all, I'm looking into using the Boost.Signals. The library claims not to be thread safe. What does this mean exactly? When using Boost.Threads, can I make concurrent calls to connect as long as I wrap each call in a Mutex? If this is possible, do tackable objects also still work (if two trackable objects get destroyed in two different threads there might be a problem from what I understand) On an different note, I am trying to use Boost.Signals for network event handling. I'd like to set it up so that it uses something similar to he JavaScript event model, where every slot returns a boolean value. If that value is false, the remaining slots are not called. Would anyone have any recommendations on how to do this? Should I wrap each slot in a function that takes the return value and sets a global flag, then every subsequent slot checks the flag? It looks like combiners would not be appropriate, as it appears they are used after each slot is called (unless the InputIterator' opeator* actually calls the slot??) Thanks for any help -Eugene

2 1

stream operators and random number generators
by Witz 10 Jul '03

10 Jul '03

hi, in my code i need to be able to save the state of my program including that of he random number generators but under MSVC 7.1.3088 the following code: int main() { boost::mt19937 rng; std::cout << rng; return 0; } won't compile and gives the error: "error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'boost::mt19937' (or there is no acceptable conversion)" there a workaround for this (beyond my hacky solution of adding load and save functions to the mersenne_twister class)? thanks in advance, ian whittley

1 0

BOOST_MPL_DEPENDENT_TEMPLATE_TYPEDEF
by Joaquín Mª López Muñoz 10 Jul '03

10 Jul '03

I've read on some archived post in the boost mailing list about BOOST_MPL_DEPENDENT_TEMPLATE_TYPEDEF, but seems like it is not in the 1.30 distribution anymore. Anyone knows what happened to it? I'm in need of this sort or workaround. Aleksey, are you there? :) Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

2 1

deadlock in filesystem?
by Ken Alverson 10 Jul '03

10 Jul '03

I'm running into an odd deadlock situation, and I was wondering if it's a known issue, or if there's likely something wrong with my code, or if I've misconfigured something? First off, a stack trace: ntdll.dll!77f5b7f4() kernel32.dll!77e61bf5() scanner.exe!boost::detail::sp_counted_base::release() Line 132 + 0xf C++ scanner.exe!boost::detail::shared_count::~shared_count() Line 380 C++ scanner.exe!boost::shared_ptr<boost::filesystem::directory_iterator::dir_itr_i mp>::~shared_ptr<boost::filesystem::directory_iterator::dir_itr_imp>() + 0x2e C++ scanner.exe!boost::shared_ptr<boost::filesystem::directory_iterator::dir_itr_i mp>::reset() Line 217 C++ scanner.exe!boost::filesystem::directory_iterator::m_inc() Line 256 C++ scanner.exe!boost::filesystem::directory_iterator::operator++() Line 88 + 0x2b C++ scanner.exe!std::for_each(boost::filesystem::directory_iterator _First={...}, boost::filesystem::directory_iterator _Last={...}, scan_file _Func={...}) Line 20 + 0xa C++ I'm using boost 1.30.0 running a staticly linked debug build of the filesystem lib, on vc7. The for_each is actually the most recursed level of a recursive directory search - I'm pretty sure that code is fine; I'm very familiar with STL iteration and I'm not doing anything strange, just: std::for_each( fs::directory_iterator(dir), fs::directory_iterator(), scan_files(fileset)); where scan_files will recurse on directories and process on files. I don't touch the iterators directly other than to pass them to for_each. Now, the strange part is this program works completely fine when I simply run it from the command line. However, I am building it into a windows service, and when it runs as a service under the SYSTEM account (I haven't tried running it as a service under a different account, yet), I get deadlock. I suspected the problem might be related to funny permissions on the directory in question, but SYSTEM has full rights to the directory, so that shouldn't be the problem. Oddly, when I use the release filesystem lib it deadlocks in a different location in the search, but in the same sp_counted_base::release() function - this time in an attempt to unwind after a filesystem exception. I tried to search the mailing list for similar problems, but the search seems to be broken at the moment. I'm hoping this is an easy fix, known issue, because I'm at a loss as to how I could be causing it, especially since I'm not getting anywhere near the internals of the directory iterators. I am a fairly new user to boost, but up until now I've had no problems. Sorry if this is a jumble...I've been banging my head against this for the past few hours and my coffee is wearing off. Ken

3 11

newbie build problems with msvc-stlport toolset
by uncle_buck_598 10 Jul '03

10 Jul '03

I am attempting to build the complete boost library set with the command line: bjam -sTOOLS=msvc-stlport "-BUILD=debug release <stlport-iostream>on" Unfortunately, 5 of the release DLLs fail to link with the following error: unresolved external symbol "public: static void __cdecl _STL::_STLP_mutex_spin<0>::_M_do_lock(long volatible *)" ("_M_do_lock@?$_S_STLP_mutex_spin@$0A@@_STL@@SAXPCJ@Z) What is confusing is that the debug DLLs all build with out a hitch! I am using MSVC 6.0 SP5, STLport-4.5.3, and Windows Platform SDK - Nov2002. Any help would be greatly appreciated!! --Jamie

1 0

configuring MSVC 7.1 to use boost build
by Dave Gomboc 10 Jul '03

10 Jul '03

I'm trying to use boost::signals and boost::regex with MSVC 7.1 I retrieved the current CVS state with WinCVS, downloaded a binary of bjam (3.1.4), used the Visual Studio .NET 2003 Command Prompt, invoked bjam with the argument "-sTOOLS=vc7.1", and have added the boost path to Tools|Options|Projects|VC++ Directories (Include Files). When I compile programs I get link errors, e.g. signals_test.obj : error LNK2019: unresolved external symbol "public: void __thiscall boost::signals::connection::disconnect(void)const " (?disconnect@connection@signals@boost@@QBEXXZ) referenced in function "public: __thiscall boost::signals::connection::~connection(void)" (??1connection@signals@boost@@QAE@XZ) signals_test.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::signals::detail::signal_base::~signal_base(void)" (??1signal_base@detail@signals@boost@@QAE@XZ) referenced in function "public: __thiscall boost::signal0<void,struct boost::last_value<void>,int,struct std::less<int>,class boost::function0<void,class std::allocator<class boost::function_base> > >::~signal0<void,struct boost::last_value<void>,int,struct std::less<int>,class boost::function0<void,class std::allocator<class boost::function_base> > >(void)"(??1?$signal0@XU?$last_value@X@boost@@HU?$less@H@std@@V?$functio n0@XV?$allocator@Vfunction_base@boost@@@std@@@2@@boost@@QAE@XZ) I have tried to add library paths in the IDE in a similar fashion to how I added the include path, but I had no success when building a test project. What do I need to do to successfully link? Thanks, Dave P.S. It might be a good idea to add the "vc7.1" target to http://www.boost.org/tools/build/index.html#Configuring.

2 1