- Boost-users - lists.preview.boost.org

date_parsing.hpp.patch
by Tonal 31 Jul '03

31 Jul '03

This is simple refactore and improved date_parsing.hpp begin 666 date_parsing.hpp.patch M*BHJ(&1A=&5?<&%R<VEN9RYH<' N;W)I9PE4:'4(a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a)9&5T86EL.CIP87)S95]D E871E/&1A=&5?='EP93XH=&]K*3L-"B @("!]#0H@( T*(" -"@`` ` end

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