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regex_match doesn't match in an embedded string
by soleani 17 Jan '02

17 Jan '02

Hi there, not sure how I could write that Subject line. Sorry :-) Here's the thing, I have a file with the following: KEY1 = ${short_localhost} KEY2 = bbbf<control2.cfg:OTHER_SECTION:${long_localhost}>aaaf:<he I need to extract the value between the {} when it starts with a $. My expression works ok for KEY1 (the value part, the string to the right of the equal sign), however it doesn't match for the value for KEY2. This is what I have: static const boost::regex expression( "\\$\\{(.*?)\\}" ); boost::cmatch what; if ( boost::regex_match( input, what, expression ) ) { cerr << "GOT IT!" << endl; } else { cerr << "NOPE" << endl; } where input is a std::string with the value described above. Why does it work for KEY1 and not KEY2? Interestingly enough, if I do the following: KEY1 = dd${short_localhost} it doesn't match either. This same expression in Perl works fine though. thanks, -Anibal

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RE: [Boost-Users] boost tokenizer
by Jim.Hyslop 17 Jan '02

17 Jan '02

Peter Dimov [SMTP:pdimov@mmltd.net] wrote: > From: "hicks" <hicks(a)kgk.co.jp> > > Do you know why the compiler places precedence on that interpretation, > > rather than on one giving an instatiation of a local variable? > > The C++ standard says that a function declaration takes precedence. Don't > ask me why. :-) (At the risk of sliding seriously off topic...) I suspect it's something along these lines. Given this function: void f() { int WhatIsThis(); } Is "WhatIsThis" intended to be a declaration of a function, or is it intended to be a definition and default-initialization of an int variable? A C++ compiler cannot know, so the C++Standards committee had several choices: 1) require the compiler to flag the statement as an ambiguous statement 2) require the compiler to interpret the statement as a declaration of a function 3) require the compiler to interpret the statement as a definition of an int If we examine the same syntax in C, there is no question what it is: 'WhatIsThis' is a declaration of a function. That effectively eliminates #3 from consideration because you don't want one statement to have different meanings in C and in C++. I suspect the Committee then either flipped a coin (or some used other democratic means, such as debating and voting on the issue, thumb-wrestling, or playing paper-rock-scissors) to decide between #1 and #2, or choose to adapt the well-worn guideline "When in doubt, do as the ints do" to "When in doubt, do as C does". -- Jim

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boost tokenizer
by hicks 17 Jan '02

17 Jan '02

Dear boost users I am trying to use the boost tokenizer with Borland Builder C++ 5 compiler. This far compiles fine: boost::tokenizer<> tok(std::string(ac0)); All further references to tok such as tok.assign(std::string(ac0)) or tok.begin() result in an error message " Structure requires on the left side of . or .*" Any advice would be welcome. Craig Hicks Engineer, KGK, Tokyo Japan

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Boost Array Question
by Duane Murphy 16 Jan '02

16 Jan '02

Below is a simple example that I cannot get to compile. I would like to create a subclass of boost::array in order to give it some additional functionality (I would like a associative array like interface). When I compile this, I get an "illegal initialization" error for test. I am using Metrowerks Codewarrior 7 on Mac OS X. Is there some special incantation required? I suspect that I am in some kind of specialized area and I cant get there from here. template < class T, std::size_t N > struct test_array : public boost::array< T, N > { }; static boost::array< char,1 > array_test = {{ 'a' }}; static test_array< char, 1 > test = {{ 'a' }}; It appears that if I aggregate instead of inherit that this might work (at least it compiles :-) template < class T, std::size_t N > struct test_array { boost::array< T, N > array_; }; static boost::array< char,1 > array_test = {{ 'a' }}; static test_array< char, 1 > test = {{ 'a' }}; // The funny thing is this works also: static test_array< char, 1 > test2 = { 'a' }; TIA, ...Duane

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tokenizer
by rradh 16 Jan '02

16 Jan '02

Hi, I have string line("a_1 = b_1 ( c_2 )") tokenizer< > tok(line); for (tokenizer<>::iterator beg=tok.begin(); beg!=tok.end();++beg) { cout << *beg << endl; } gives me a 1 b 1 c 2 I want to be able to specify delimiters like in strtok so that I get a_1, b_1 and c_2 but couldn't figure out how to specify the tokenizer function. Any suggestions? Regards Rajesh

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graph: depth first search
by tobi_schuele 15 Jan '02

15 Jan '02

Hi, I'd like to use depth_first_search to check whether a particular vertex is reachable from the root vertex. Is there a way to stop the search when the vertex is found? In other words, can a visitor be used to cut the search tree? Sorry, if this is a newbie question. Thank you very much in advance for your help. Tobias

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[newbie] segmentation fault on running dijkstra example on RedHat 7.2
by Mohammad M. Purbo 15 Jan '02

15 Jan '02

Dear All, I'm new to BOOST. I tried to compile the [BOOST_HOME/libs/graph/example/dijkstra-example.cpp] provided on the distribution with the following comand: gcc -I/home/purbo/include -lstdc++-3-libc6.2-2-2.10.0 -o dijkstra-example dijkstra-example.cpp no error on compiling/linking, but when i ran it, i got: Segmentation fault I used: RedHat 7.2 gcc 2.96 Anybody knows the problem? Thank you in advance, M. Purbo

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A Static Map?
by Duane Murphy 14 Jan '02

14 Jan '02

I have learned a lot about templates and library programming from reading and using the Boost code. Recently I have been finding myself doing something that I would call Static Maps. Basically I would like to use an array of structs as if it were a map or associative array. Does boost have anything like this or can anyone recommend something like that? Here is a simple example: struct entry { const char* key; const char* value; }; const entry entries[] = { { "one", "Hello" }, { "two", "World" }, { "three", "!" } }; { some_type the_map = make_static_map( entries ); const char* word = the_map[ "one" ]; } This is a real poor example, but shows the idea. The struct could be any types that are less-than comparable; maybe there is some special arrangment of key and type. But the idea is there. I would like to be able to lookup items in a static array of items using array notation (other than numerically indexed). For extra credit, the interface would be writeable also; aka a fixed array space map. Any idea? Comments? Suggestions? ..Duane

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Any interest in a weak pointer?
by wayneconrad 14 Jan '02

14 Jan '02

Is there any interest in a weak pointer that plays well with shared_ptr and its friends? Wayne Conrad

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RE: [Boost-Users] Any interest for a parser class?
by Bjorn Karlsson 14 Jan '02

14 Jan '02

> From: Patrick Guio [mailto:patrick.guio@fys.uio.no] > > > Dear all, > I have written a parser class and I wanted to know whether it > could be of > any interest to be included in the boost system. Here is a > short description > of it. > This class is meant to be used in two ways, either to be > included in another > class as an inherited class and/or to be included in the main routine. > [snip] > > This is brief example to show how the class Parser can be used. > it can be used to handle more complex inherited classes. > If it can be of any interest, let me know and I will provide > you with more > details. > > Sincerely, > Patrick > I suggest that you also post this message to the Boost mailing list (http://groups.yahoo.com/group/Boost/) While Boost-Users certainly is a good place to get insightful opinions and reflections, the focus is to handle issues related to using existing Boost libraries. Also, library submissions and reviews are performed by the Boost list, so you'll need to go there sooner or later. Regards, Bjorn [Non-text portions of this message have been removed]

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Any interest for a parser class?
by Patrick Guio 14 Jan '02

14 Jan '02

Dear all, I have written a parser class and I wanted to know whether it could be of any interest to be included in the boost system. Here is a short description of it. This class is meant to be used in two ways, either to be included in another class as an inherited class and/or to be included in the main routine. The first use is for classes containing fields to be initialised with some values. So far it handles intrinsic C++ types and STL vectors of intrinsics. As an example, the class Parser can be used in the class Foo as class Foo : public Parser { Foo::Foo(int nargs, char *args[]); private: enum { var1_enum, ... }; int var1; .... }; The Foo constructor that uses the Parser feature looks like Foo::Foo(nargs, args, ....) : Parser(nargs, args), var1(default_var1), ... { // Register class Parser::RegisterClass("Foo"); Parser::RegisterPackage(package, version, copyright); // Insert options and aliases to parse a value to var1 // the Any constructor is used to register the default value Parser::InsertOption(var1_enum,"var1","var1_type","var1_comment", Any(var1)); // Insert alias to option Parser::InsertOptionAlias(var1_enum, "var1_alias1"); Parser::InsertOptionAlias(var1_enum, "var1_alias2"); .... // Possibility to add a "debug level option" that takes an int argument, // the default value is 0 Parser::ParseLevelDebugOption("debug_level_option_name"); // the member function int Parser::DebugLevel() can be used thereafter to // check the this value if (Parser::DebugLevel() > 50) cout << "Debug level is " << Parser::DebugLevel() << endl; } Then a member function Foo::ParseParameters() method could look like void Foo::ParseParameters() { // The ParseOption family member functions return a boolean indicated // whether the var1 has been parsed if (Parser::ParseOption(var1_enum,var1)) cout << "var1 = " << var1 << " parsed." << endl; // Other ParseOption member functions are // * Parser::ParseOption(var1_enum,var1,"filename") // parse the filename "filename" instead of the command line // * Parser::ParseOptioninFileonCmdLine(var1_enum,var1) // if the option -i/--input[=]paramter_file is on the command line then // parse first the parameter_file, thereafter the command line. // * Parser::ParseOptiononCmdLineinFile(var1_enum,var1) // if the option -i/--input[=]paramter_file is on the command line then // parse first the command line, thereafter the parameter_file // * Parser::ParseHelp() // if the option -h/--help is parsed, print to standard output a message // with class_name information and a list of all the registered/inserted // options for that class in the predefined format : // option_name[,option_aliases] option_type option_comment // and return a true boolean // * Parser::ParseVersion() // if the option -v/--version is parsed, print to standard output a // message containing information package, version, copyright for the class // * Parser::ParseTemplate() // if the option --create-template is parsed, print to standard output a // message with class_name information and a list of all the // registered/inserted options for that class in a format to be used // later with the -i/--input containing information about variable and // aliases, type of the variable, comment/description and default value } The second way of using is from the main routine and is very similar to the first way int main(int nargs, char *args[]) { try { Parser parser(nargs, args); parser.RegisterProgram(args[0]); parser.RegisterPackage(package, version, copyright); Foo foo(nargs, args); // Insert options if necessary ... // Parse defaults if (parser.ParseHelp()) { foo.ParseHelp(); return EXIT_SUCCESS; } if (parser.ParseVersion()) { foo.ParseVersion(); return EXIT_SUCCESS; } if (parser.ParseTemplate()) { foo.ParseTemplate(); return EXIT_SUCCESS; } // Parse option for program if necessary ... // Parse class option foo.ParseParameters(); ... return EXIT_SUCCESS; } catch(ParseException &x) { cerr << x.what() << endl; return EXIT_FAILURE; } } The try/catch is used to handle potential errors at parsing and uses a class ParseException. This is brief example to show how the class Parser can be used. it can be used to handle more complex inherited classes. If it can be of any interest, let me know and I will provide you with more details. Sincerely, Patrick ====================================================================== Patrick Guio Institute of Physics, University of Oslo P.O. box 1048, Blindern, N-0316 Oslo Tel : (+47) 22 84 40 60 - Fax : (+47) 22 85 56 71 E-mail : patrick.guio(a)fys.uio.no URL : http://folk.uio.no/~patricg

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iterator_adaptors Comment
by Duane Murphy 14 Jan '02

14 Jan '02

There is a comment in iterator_adaptors: public: // implementation details (too many compilers have trouble when these are private). Policies& policies() { return m_iter_p.second(); } const Policies& policies() const { return m_iter_p.second(); } Base& iter() { return m_iter_p.first(); } const Base& iter() const { return m_iter_p.first(); } This seems to imply that iter() and policies() ought to be private. I would like to suggest that having access to the underlying iterator is valuable. This is especially true of transform and projection iterators which allow you to locate a record by searching on a field. Access to the underlying iterator gets access to the rest of the record. Is there some other way of accomplishing the same thing without using iter()? Thanks, ...Duane

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iterator_adaptor const iterator question
by Duane Murphy 14 Jan '02

14 Jan '02

I have now built a couple of iterators using boost::iterator_adaptor. These are not adapted iterators but rather iterators developed to iterate over interfaces that have not iterators. I havent found a good example of how to declare the equivalent of a const_iterator like in vector. What would the declartion look like? If the definition of an iterator is: typedef boost::iterator_adaptor< Base, Policy > iterator; What would the declartion for a const_iterator look like? Thanks for the help. ..Duane

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[newbie]compiling 'regex_split example: split a string into tokens' failed
by pr275116 11 Jan '02

11 Jan '02

Hello, compiling the 'regex_split example: split a string into tokens' failed with an 'undefined symbols' message (see below). I am using Project Builder 1.1.1 the following compiler: Apple Computer, Inc. version gcc-934.3, based on gcc version 2.95.2 19991024 (release) on MacOSX 10.1.2 (Unix BSD 4.4). Any help would be much appreciated. Philippe de Rochambeau /usr/bin/jam -d1 JAMBASE=/Developer/Makefiles/pbx_jamfiles/ProjectBuilderJam base JAMFILE=- build ACTION=build TARGETNAME=Boost2 NATIVE_ARCH=ppc BUILD_STYLE=Development CPP_HEADERMAP_FILE=/Users/philippe/Documents/Projets_ ProjectBuilder/Boost2/build/intermediates/Boost2.build/Header maps/Boost2.hmap DSTROOT=/ OBJROOT=/Users/philippe/Documents/Projets_ProjectBuilder/B oost2/build/intermediates SRCROOT=/Users/philippe/Documents/Projets_ProjectBuilder/ Boost2 SYMROOT=/Users/philippe/Documents/Projets_ProjectBuilder/ Boost2/build ...updating 9 target(s)... BuildPhase Boost2 Completed phase <CopyHeaders> for Boost2 CompileCplusplus /Users/philippe/Documents/Projets_ProjectBuilder/Boost2/build/ intermediates/Boost2.build/Objects/ppc/main.o BuildPhase Boost2 Completed phase <DeriveAndCompileSources> for Boost2 MasterObjectFile.Combine /Users/philippe/Documents/Projets_ProjectBuilder/Boost2/build/ intermediates/Boost2.build/master.o StandaloneExecutable /Users/philippe/Documents/Projets_ProjectBuilder/Boost2/build/ Boost2 /usr/bin/ld: warning prebinding disabled because of undefined symbols /usr/bin/ld: Undefined symbols: __._Q25boost11bad_pattern __._Q25boost14bad_expression __Q35boost9re_detail13c_traits_base.class_map __Q35boost9re_detail13c_traits_base.lower_case_map __Q35boost9re_detail13c_traits_base.syntax_map ___Q25boost14bad_expressionRCt12basic_string3ZcZt18strin g_char_traits1ZcZt24__default_alloc_template2b0i0 ___Q25boost7regbase ___vt_Q25boost11bad_pattern ___vt_Q25boost14bad_expression _do_lookup_class__Q35boost9re_detail13c_traits_basePCc _do_lookup_collate__Q35boost9re_detail13c_traits_baseRt12 basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_t emplate2b0i0PCc _error_string__Q35boost9re_detail13c_traits_baseUi _init__Q25boostt14c_regex_traits1Zc _m_free__Q25boostt14c_regex_traits1Zc _toi__Q25boostt14c_regex_traits1ZcRPCcPCci _toi__Q25boostt14c_regex_traits1Zcc _transform__Q25boostt14c_regex_traits1ZcRt12basic_string3Z cZt18string_char_traits1ZcZt24__default_alloc_template2b0i0R CB1 _transform_primary__Q25boostt14c_regex_traits1ZcRt12basic _string3ZcZt18string_char_traits1ZcZt24__default_alloc_templa te2b0i0RCB1 _update__Q25boostt14c_regex_traits1Zc /usr/bin/cc -o "/Users/philippe/Documents/Projets_ProjectBuilder/Boost2/buil d/Boost2" "-L/Users/philippe/Documents/Projets_ProjectBuilder/Boost2/bu ild" "-F/Users/philippe/Documents/Projets_ProjectBuilder/Boost2/bu ild" -filelist "/Users/philippe/Documents/Projets_ProjectBuilder/Boost2/buil d/intermediates/Boost2.build/Objects/LinkFileList" "-arch" "ppc" "-prebind" "-lstdc++" ...failed StandaloneExecutable.LinkUsingFileList /Users/philippe/Documents/Projets_ProjectBuilder/Boost2/build/Boost2 ...

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tuple I/O trouble
by s1imshady86 11 Jan '02

11 Jan '02

When my test program gets to the cout << a; line i get a external error. As far as i can tell the library is setup right. I had no problem using tuples in other programs but cant seem to print them. The documentation doesn't list this feature as broken on my compiler or any compiler for that matter. Im using MSVSC++ btw. #include <iostream> #include <boost/tuple/tuple_io.hpp> using namespace std; using namespace boost; int main () { tuple<int,int> a (23,42); cout << a; return 0; } heres the error verbatim: --------------------Configuration: Tuple - Win32 Debug---------------- ---- Compiling... Test.cpp Linking... Test.obj : error LNK2001: unresolved external symbol "private: static int const * const boost::tuples::detail::format_info::stream_index" (?stream_index@format_info@detail@tuples@boost@@0QBHB) Debug/Tuple.exe : fatal error LNK1120: 1 unresolved externals Error executing link.exe. Creating browse info file... Tuple.exe - 2 error(s), 0 warning(s)

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Using boost::thread under Visual C++
by cadenzajon 10 Jan '02

10 Jan '02

Hi all, I'm starting to use boost for the first time now, but I'm having problems linking to the thread library (libboost_thread.lib) from within Visual C++. Using my main compiler, VC++ 6.0, I get the following linker error: libboost_thread.lib(exceptions.obj) : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<ch ar>,class std::allocator<char> >(char const *)" I checked the compiler compatibility tables online at the boost site, but they're not recent enough to include any details on the thread library. When I use Visual C++ .NET (feel free to shrink away in horror) to test it, I get about 8 linker errors complaining that a handful of standard library functions (most dealing with the basic_string and exception classes) are being redefined by libboost_thread.lib. Does anybody have any experience with this or ideas on what I could be doing wrong? I'm just starting to do multi-platform software design, and boost::thread would be a godsend! Thanks, Jonathan

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MacOSX
by pr275116 10 Jan '02

10 Jan '02

Hello, I am currently trying to build Boost on MacOSX 10.1.2. I 'made' Jam for MacOSX then typed jam -sBOOST_ROOT=. -sTOOLS="gcc" to build Boost. As a result, I got many failures: ..... g++ -c -Wall -ftemplate-depth-100 -DNDEBUG -DBOOST_RE_BUILD_DLL=1 -O4 -finline-functions -Wno-inline -fPIC -I"libs/regex/build" -I"." -o "libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/w32_regex_traits.o" "libs/regex/build/../src/w32_regex_traits.cpp" ...failed gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/w32_regex_traits.o ... gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o zsh: command not found: g++ g++ -c -Wall -ftemplate-depth-100 -DNDEBUG -DBOOST_RE_BUILD_DLL=1 -O4 -finline-functions -Wno-inline -fPIC -I"libs/regex/build" -I"." -o "libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o" "libs/regex/build/../src/wide_posix_api.cpp" ...failed gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true/wide_posix_api.o ... ...skipped <libs!regex!build/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true>libboost_regex.so for lack of <libs!regex!build/libboost_regex.so/gcc/release/runtime-link- dynamic/shared-linkable-true>c_regex_traits.o... ...failed updating 78 targets... ...skipped 8 targets... Has anyone in this group managed to build Boost on MacOS 10.1.2? If so, what configuration did you use? Could you please send me your ProjectBuilder project file? Many thanks. Philippe de Rochambeau

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RE: [Boost-Users] New poll for Boost-Users
by Bjorn Karlsson 10 Jan '02

10 Jan '02

> From: Ken Hagan [mailto:k.hagan@thermoteknix.co.uk] > > Well I tried but I got an error message saying "Oops. You are > not a moderator." Is Yahoo based in Florida, or Zimbabwe? > We (the confused moderators) made a mistake - sorry about that. The moderating force is currently discussing the question of membership visibility, and the poll is, at least for now, off. Suggestions and comments can (of course) be sent to the moderators or to the list. Bjorn [Non-text portions of this message have been removed]

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New poll for Boost-Users
by Boost-Users＠yahoogroups.com 10 Jan '02

10 Jan '02

Enter your vote today! A new poll has been created for the Boost-Users group: Yahoo! groups can be configured so that only the moderators can view membership list, or so that membership lists can be viewed by anyone (email addresses are always munged for non-moderators; my email address would appear as something like jim.hyslop@.le...) Do you want the membership list to be freely available to be viewed by anyone, or do you want the membership list kept private so only the moderators can view the list? o I want only the moderators to be able to view the membership list o I want anyone to be able to view the membership list To vote, please visit the following web page: http://groups.yahoo.com/group/Boost-Users/polls Note: Please do not reply to this message. Poll votes are not collected via email. To vote, you must go to the Yahoo! Groups web site listed above. Thanks!

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RE: [Boost-Users] Viewing membership (was: boost::pool + shared m emory)
by Jim.Hyslop 08 Jan '02

08 Jan '02

Chris Little [SMTP:clittle@renlearn.ca] wrote: > Jim, > > Polls are limited to Moderators in this group. i.e. only moderators can > respond to the poll. Doh! I never even thought to check that. Jon, can we lighten that restriction slightly, to "limited" (Moderators can create polls, members can vote)? -- Jim

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RE: [Boost-Users] Viewing membership (was: boost::pool + shared m emory)
by Chris Little 08 Jan '02

08 Jan '02

Jim, Polls are limited to Moderators in this group. i.e. only moderators can respond to the poll. Chris > -----Original Message----- > From: Jim.Hyslop [mailto:jim.hyslop@leitch.com] > Sent: Tuesday, January 08, 2002 10:17 AM > To: 'Boost-Users(a)yahoogroups.com' > Subject: RE: [Boost-Users] Viewing membership (was: > boost::pool + shared m emory) > > > Tom Matelich [SMTP:tmatelich@zetec.com] wrote: > > PS Why can't I see who is a member of this group? I > wanted to check > > to > see > > if Steve Cleary was a member. Sorry if you are Steve. > Because that's the way the group was set up. Only moderators > can view the membership list. > > It can be changed easily enough, if people want it changed. > Hey, here's a great opportunity to take advantage of Yahoo! > Group's poll feature. > > -- > Jim [Non-text portions of this message have been removed]

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RE: [Boost-Users] Viewing membership (was: boost::pool + shared m emory)
by Jim.Hyslop 08 Jan '02

08 Jan '02

Tom Matelich [SMTP:tmatelich@zetec.com] wrote: > PS Why can't I see who is a member of this group? I wanted to check to see > if Steve Cleary was a member. Sorry if you are Steve. Because that's the way the group was set up. Only moderators can view the membership list. It can be changed easily enough, if people want it changed. Hey, here's a great opportunity to take advantage of Yahoo! Group's poll feature. -- Jim

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boost::pool + shared memory
by Tom Matelich 07 Jan '02

07 Jan '02

I need to build a system for having miscellaneous objects in a shared memory segment. Essentially, we need a few inter-process singletons. These classes have STL containers, so I was looking at using pool_allocator and writing a UserAllocator to use ACE_Mem_Map ( http://doc.ece.uci.edu/Doxygen/Current/html/ace/classACE__Mem__Map.html#_det ails ) or something. I just wanted to see if anyone had done anything resembling this and could give me any pointers or tips. Thanks, Tom Matelich PS Why can't I see who is a member of this group? I wanted to check to see if Steve Cleary was a member. Sorry if you are Steve.

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overflow of clock_t with clock(), timing longer processes
by gigu74 07 Jan '02

07 Jan '02

hello hackers first a hi to everyone. just signed today as a new member to this mailinglist. well.. i've got a problem and hope someone can help me. i run a c++ program (mostly on a sunblade 100 or a sunblade 1000) about genetic algorithms which takes quite some time to solve for certain problems (up to 100 hours) because its important to me to compare different jobs i need to measure the elapsed cpu time used for the particular jobs. well, i could use the standart system time, but because my running job is not always the only one i dont get really worthy results. so i used the std::clock(). but measuring 1/1000000 of a seconds with that and with the clock_t beeing a long int of course this results in a overflow after around 36 minutes. thought to find something about that in the boost library but timer.hpp just gets also de maximum elapsed time out.. doesnt really help is there some way this can be achieved? would be really neat to get an answer from anyone soon. thanks uf

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bind question
by Duane Murphy 05 Jan '02

05 Jan '02

Is there a syntax for making boost::bind bind to functions that are templates? Here is an (extremally simplified) example that doesnt compile: #include <boost/bind.hpp> template < class Function > void f( Function func ) { func( 46 ); } void g( int num ) { num++; } int main( void ) { boost::bind( f, g )(); boost::bind( f, _1 )( g ); return 0; } The two bind lines in main both get an error "call of non-function". Is there a way to make this work? ..Duane p.s. CodeWarrior 7 on a Macintosh (OS X)

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Another Bind Question
by Duane Murphy 04 Jan '02

04 Jan '02

Bind has been working very well for some of the things I have been wanting to do. I have run into a rather puzzling problem this time and was wondering what was happening: Here is the example: void f( int ) { } struct array_obj { int operator[]( int ){ return NULL; } }; int main() { array_obj a; int array[1]; int value = a[0]; boost::bind( f, _1 )( 3 ); boost::bind( f, _1 )( value ); boost::bind( f, _1 )( array[0] ); boost::bind( f, _1 )( a[0] ); return 0; } The first three bind statements compile just fine. The third one issues an error: function call 'operator()(int)' does not match. Along with all 20 variations of operator() generated by bind. Obviously there is something amiss with going through the return value of operator[](). I also get the same problem using an iterator which would be going through operator*(). I am using CodeWarrior 7 on Mac on OS X. Could this be a compiler specific problem? I can work around the problem using bind1st but it seems odd that bind1st works and bind doesnt? Could CW have included some magic in bind1st to work around this? Thanks for the help, ..Duane

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Using boost::thread under Visual C++
by John Maddock 03 Jan '02

03 Jan '02

>I'm still flummoxed. If you have more ideas, I would really appreciate >them. Why not just use your IDE to build threadmon.cpp as a dll, and the rest of the source as a static lib, using whatever your project options are? - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

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iterator_adaptors on Tru64 version V6.1-027
by vvasta 02 Jan '02

02 Jan '02

Hi all, I'm trying to use the iterator_adaptors class on Tru64. To make it work I had to do the following changes: In concept_check.hpp I had to change the code from this: template <class Concept> inline void function_requires() { #if !defined(NDEBUG) void (Concept::*x)() = BOOST_FPTR Concept::constraints; ignore_unused_variable_warning(x); #endif } to this: template <class Concept> inline void function_requires(type<Concept> t = type<Concept>()) { #if !defined(NDEBUG) void (Concept::*x)() = BOOST_FPTR Concept::constraints; ignore_unused_variable_warning(x); #endif } because this compiler generates an error if a template parameter is not used in the function declaration. In iterator_adaptors.hpp I had to remove the parenthesis around all the if_true bool template parameter from this: typedef typename if_true<( // original version ::boost::is_same<Value,typename iterator_traits<Iterator>::value_type>::value )>::template then< typename iterator_traits<Iterator>::pointer, Value* >::type pointer; to this: typedef typename if_true< // Changed version no parenthesis ::boost::is_same<Value,typename iterator_traits<Iterator>::value_type>::value >::template then< typename iterator_traits<Iterator>::pointer, Value* >::type pointer; It is possible to put this changes in the original distribution in order to avoid to put this changes in any new boost release I use ? Thanks for your help Vincenzo

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Building nested FSM with BGL...
by Herman Bruyninckx 31 Dec '01

31 Dec '01

Has anyone already implemented a nested Finite State Machine with the Boost Graph Library? (Or a Petri net for that matter.) The thing that really puzzles me is how to implement the nesting, i.e., all nodes in a subset of the graph react to the same ``events'' from the ``outside world'', but I want to avoid making all the edges from the ``outside world'' nodes to the subset nodes... Herman

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Re: new component, extent_set<>
by Nathan Myers 30 Dec '01

30 Dec '01

"David A. Greene" wrote: > Nathan Myers wrote: > > boost::extent_set<> implements a set of half-open ranges on a scalar > > type, with automatic splitting and merging, appropriate for managing > > ranges of disk blocks or video frames. In use it looks like: > > Cool! Why "extent_set" though? What about range_set or interval_set? "Extent" is the standard term of art when speaking of ranges of disk blocks, particularly as part of a file system. Also, since it's not really a set of ranges, range_set seemed inappropriate. > Any way this could be adapted to allow non-scalar ranges? What are > the requirements on the range element type? I would think anything > less-than-comparable should be useable but I didn't implement the > class. :) The current version uses closed ranges, BTW. The requirements are minimal: as listed in the header file, the Bound argument must be copyable, assignable, equality-comparable, comparable using the Compare argument, and incrementable and decrementable using the Succ and Pred arguments. It imposes no other requirements, so a non-scalar could work. Unfortunately I don't know how to define a useful decrement operator for a string, or a Compare operator for a complex number. Did you have some particular non-scalar in mind? The original version didn't need the increment and decrement operations, internally, but the client was still obliged to apply the equivalent of an increment operation. That made it slippery to use on strings. You could define increment to mean "append a space", so that a dictionary page might occupy the range "lost" to "love " (note the space). That assumes a lot about the character encoding, which the client (but not extent_set<>) is allowed to do. Unfortunately there is no simple equivalent for decrementing, so the trick doesn't work with closed ranges. It is conceivable that I might be able to continue storing half-open ranges internally, and thus avoid needing a decrement operation. It seems a bit fragile though. > Is there a way to control when ranges are combined (maybe sometimes > I want [10, 20) and [20, 30) to stay separate)? A policy for this > would be nice. It doesn't provide that in the current version. In fact, the presence of such a pair of extents would violate an invariant, breaking the insert and erase members as written. (They could probably be changed to accommodate it, at some cost in complexity.) How would you use such a feature? Nathan Myers ncm at cantrip dot org

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Presentation Boost at Fosdem
by Toon Knapen 27 Dec '01

27 Dec '01

Dear Boost Developers, Currently, a presentation of Boost is scheduled at FOSDEM (www.fosdem.org) Fosdem is an anual free and open-source developer meeting in Brussels, Belgium that is gaining a lot of momentum, with an audience from all over europe and many international speakers of highly visible open-source projects. As has been discussed on the list before, Boost is well known to the standard commitee but need also be more visible to a wider public. That's also why I proposed to the Fosdem organiser (Raphael Bauduin) to schedule a Boost presentation. Boost developers and users that are planning to attend, contribute, ... please let me know. Toon

1 0

new component, extent_set<>
by Nathan Myers 27 Dec '01

27 Dec '01

I have uploaded to the Boost files section couple of archives containing an implementation of a class template extent_set; look in the folder "extent_set". The zip and tgz archives there are identical. Included in each is a header file and a test suite. boost::extent_set<> implements a set of half-open ranges on a scalar type, with automatic splitting and merging, appropriate for managing ranges of disk blocks or video frames. In use it looks like: boost::extent_set<int> set; set.insert(10, 20); // now contains [10,20) set.insert(30, 50); // now contains [10,20) [30,50) set.erase(40, 45); // now contains [10,20) [30,40) [45,50) set.insert(20, 30); // now contains [10,40) [45,50) std::cout << "(" << set.begin()->first << "," << set.begin()->second << ")" << std::endl; // writes "(10,40)" It is implemented using std::map. This is the initial submission. Please 'ave a look. (I am only subscribed to the -users list, so far.) Nathan Myers ncm at cantrip dot org

2 1

linker error with regex
by John Maddock 22 Dec '01

22 Dec '01

>By looking at the verbose progress messages from the linker, it >appears that the following libs (stl-port and regex only - others not >shown) are being linked against: > >Processed /DEFAULTLIB:vc6-stlport-re300m.lib >Processed /DEFAULTLIB:stlport_vc6_static.lib Those are the correct libs to link against for those options. >I am stumped as to why the linker fails from inside the IDE but works >when used from the command line! So am I, it works for me, but you are not alone in having problems with this. - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

1 0

lexiacal_cast and hex values
by rogeeff 21 Dec '01

21 Dec '01

Hi, can I you lexical_cast to convert string "0x16" to 22? Thanx, Gennadiy.

2 2

linker error with regex
by kchellap 21 Dec '01

21 Dec '01

Hi, Newbie question. I am using one of the latest versions of boost (not sure which version, but I downloaded it in Sept'00) and am using it with stlport ver 4.5. I've been successful in using the shared_ptr, shared_array, etc type of libraries with MSVC++ 6.0 (sp5) on a Win2K machine (sp2). However, recently I've been trying to get the regex library to work but seem to be getting linker errors. As indicated in the documentation, I set the env. using vcvars32, and used nmake to compile and install the regex libraries (both .lib and .dll files). As a sample I tried compiling snip1.cpp (in boost_libs\regex\demo\snippets) from the command line: D:\demo>cl /MT /D_MT -o snip1.exe -O2 -GX -GR snip1.cpp -link user 32.lib Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. snip1.cpp Microsoft (R) Incremental Linker Version 6.00.8168 Copyright (C) Microsoft Corp 1992-1998. All rights reserved. /out:snip1.exe user32.lib snip1.obj and the compile succeeded. However, when I set up the same options in the MSVC++ IDE, I get the following linker errors: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. cl /MT /GR /GX /O2 /D "_MT" /Fo"Debug/" "D:\users\kumar\boost_libs\regex\demo\snippetsmsvc\snip1.cpp" snip1.cpp Microsoft (R) Incremental Linker Version 6.00.8168 Copyright (C) Microsoft Corp 1992-1998. All rights reserved. /out:snip1.exe Debug/snip1.obj snip1.obj : error LNK2001: unresolved external symbol "public: static class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::re_detail::w32_traits_base::error_string(unsigned int)" (? error_string@w3 2_traits_base@re_detail@boost@@SA?AV?$basic_string@DV? $char_traits@D@_STL@@V?$allocator@D@2@@_STL@@I@Z) snip1.obj : error LNK2001: unresolved external symbol "public: static void __fastcall boost::w32_regex_traits<char>::transform_primary (class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &,class _STL::basic_stri ng<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?transform_primary@?$w32_regex_traits@D@boost@@SIXAAV? $basic_string@DV?$char_traits@D@_STL@@V? $allocator@D@2@@_STL@@ABV34@@Z) snip1.obj : error LNK2001: unresolved external symbol "protected: static bool __fastcall boost::re_detail::w32_traits_base::do_lookup_collate(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &,char const *)" (?do_lookup_collate@w32_traits_base@re_detail@boost@@KI_NAAV? $basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@PBD@Z) snip1.obj : error LNK2001: unresolved external symbol "public: static void __fastcall boost::w32_regex_traits<char>::transform(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &,class _STL::basic_string<char, class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?transform@?$w32_regex_traits@D@boost@@SIXAAV?$basic_string@DV? $char_traits@D@_STL@@V?$allocator@D@2@@_STL@@ABV34@@Z) vc6-stlport-re300m.lib(w32_regex_traits.obj) : error LNK2001: unresolved external symbol __imp__LoadStringA@16 vc6-stlport-re300m.lib(w32_regex_traits.obj) : error LNK2001: unresolved external symbol __imp__CharLowerW@4 snip1.exe : fatal error LNK1120: 6 unresolved externals Error executing cl.exe. By looking at the verbose progress messages from the linker, it appears that the following libs (stl-port and regex only - others not shown) are being linked against: Processed /DEFAULTLIB:vc6-stlport-re300m.lib Processed /DEFAULTLIB:stlport_vc6_static.lib I am stumped as to why the linker fails from inside the IDE but works when used from the command line! If anybody has an idea as to what is going on here or has a way to fix it, I'd really appreciate any help. Thanks, Kumar Chellapilla kumar(a)natural-selection.com

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Using PREPROCESSOR to generate macros
by Gustavo Guerra 19 Dec '01

19 Dec '01

I use the following macros in my code: #define MAKE_FLAG_TYPE1(TYPE_NAME, F1) \ enum TYPE_NAME { F1 }; \ \ ::std::ostream& operator<<(::std::ostream& os, TYPE_NAME f) \ \ switch(f) \ { \ case F1: return os << #F1; \ } \ return os << "unknown"; \ } [2, 3 and 4 argument versions] #define MAKE_FLAG_TYPE5(TYPE_NAME, F1, F2, F3, F4, F5) \ enum TYPE_NAME { F1, F2, F3, F4, F5 }; \ \ ::std::ostream& operator<<(::std::ostream& os, TYPE_NAME f) \ { \ switch(f) \ { \ case F1: return os << #F1; \ case F2: return os << #F2; \ case F3: return os << #F3; \ case F4: return os << #F4; \ case F5: return os << #F5; \ } \ return os << "unknown"; \ } I wanted to try and do it with the Preprocessor library. It should be something like this: #include <boost/preprocessor/comma_if.hpp> #include <boost/preprocessor/repeat.hpp> #include <boost/preprocessor/repeat_2nd.hpp> #include <boost/preprocessor/inc.hpp> #include <boost/preprocessor/cat.hpp> #include <boost/preprocessor/enum_params.hpp> #ifndef MAX_MAKE_FLAG_TYPE_PARAMS #define MAX_MAKE_FLAG_TYPE_PARAMS 10 #endif BOOST_PREPROCESSOR_REPEAT(MAX_MAKE_FLAG_TYPE, MAKE_FLAG_TYPE_AUX, _) #define MAKE_FLAG_TYPE_AUX(N,_) \ #define MAKE_FLAG_TYPE##N(TYPE_NAME,BOOST_PREPROCESSOR_ENUM_PARAMS(N, F)) \ enum TYPE_NAME { BOOST_PREPROCESSOR_ENUM_PARAMS(N, F) }; \ ::std::ostream& operator<<(::std::ostream& os, TYPE_NAME f) \ { \ switch(f) \ { \ BOOST_PREPROCESSOR_REPEAT_2ND(N, MAKE_FLAG_TYPE_AUX2, _) \ } \ return os << "unknown"; \ } #define MAKE_FLAG_TYPE_AUX2(N,_) \ case F##N: return os << BOOST_PREPROCESSOR_CAT(#, F##N); #undef MAKE_FLAG_TYPE_AUX #undef MAKE_FLAG_TYPE_AUX2 But then I looked at my code and clearly saw this won't do it. One of the problems is that by preprocessing I'll get things like: #define MAKE_FLAG_TYPE2(TYPE_NAME, F1, F2) enum [...] That won't work because of the spaces between the commas. And also I doubt BOOST_PREPROCESSOR_CAT(#, F##N) will work So, does anyone has any suggestions on how to implement my MAKE_FLAG_TYPE<N> macros using the Preprocessor library? Or is it just not possible? Thanks Gustavo Guerra

3 3

Compile error with boost::tokenizer and Forte 6U2
by JULES D'ENTREMONT 18 Dec '01

18 Dec '01

Hi, I'm trying to use boost::tokenizer to tokenize colon-separated strings of the form "path1:path2:path3...". I wrote the following simple test program: #include <string> #include "boost/tokenizer.hpp" void func() { std::string s("abc:def:ghi"); boost::char_delimiters_separator<char> tokenizerFunc(false, "", ":"); boost::tokenizer<boost::char_delimiters_separator<char> > tokenizer(s, tokenizerFunc); } However, this fails to compile with the Sun Forte 6U2 compiler. It spews out the following error messages: "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/detail/ob_compressed_pair.hpp", line 416: Warning (Anachronism): Type names qualified by template parameters require "typename". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/detail/ob_compressed_pair.hpp", line 416: Warning (Anachronism): Type names qualified by template parameters require "typename". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/detail/iterator.hpp", line 382: Warning (Anachronism): Type names qualified by template parameters require "typename". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/detail/iterator.hpp", line 382: Warning (Anachronism): Type names qualified by template parameters require "typename". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 922: Error: Invalid template parameter default. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 925: Error: Invalid template parameter default. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 1116: Warning (Anachronism): Type names qualified by template parameters require "typename". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 1133: Error: value is not a member of boost::is_convertible<boost::detail::reduce_to_base_class<std::forward_iterator_tag, boost::detail::iterator_traits<boost::detail::Iterator>::iterator_category>::type*, std::bidirectional_iterator_tag*>. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: While specializing "boost::detail::non_bidirectional_category<const char*>". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: Specialized in boost::token_iterator_generator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/tokenizer.hpp", line 37: Where: Specialized in boost::tokenizer<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "boostTest.cc", line 10: Where: Specialized in non-template code. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 1133: Error: An integer constant expression is required here. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: While specializing "boost::detail::non_bidirectional_category<const char*>". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: Specialized in boost::token_iterator_generator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/tokenizer.hpp", line 37: Where: Specialized in boost::tokenizer<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "boostTest.cc", line 10: Where: Specialized in non-template code. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/iterator_adaptors.hpp", line 1134: Error: The type "boost::STATIC_ASSERTION_FAILURE<0>" is incomplete. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: While specializing "boost::detail::non_bidirectional_category<const char*>". "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/token_iterator.hpp", line 90: Where: Specialized in boost::token_iterator_generator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "/nsm/rollsbuild/thirdparty/boost/boost_1_25_0/boost/tokenizer.hpp", line 37: Where: Specialized in boost::tokenizer<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>. "boostTest.cc", line 10: Where: Specialized in non-template code. 5 Error(s) and 7 Warning(s) detected. *** Error code 5 Am I using the class incorrectly, or is this a genuine problem? Jules d'Entremont -- Jules d'Entremont jules.dentremont(a)alcatel.com Alcatel Canada http://batai.ca.newbridge.com/~julesd 600 March Road 613-784-6633 Kanata ON, K2K 2E6

3 4

Re: [Boost-Users] Re: Compile error with boost::tokenizer and Forte 6U2
by George Heintzelman 18 Dec '01

18 Dec '01

(moved to boost developers list) [snip most of the changes for SunPro CC] > Also ifdef BOOST_STATIC_ASSERTs on is_input_or_output_iter and > forward_iter_with_real_reference (~lines 616-630). Whoa Nelly. I also found most of the changes you suggested, but I looked into these assert failures compiling on SunPro 5.3 -- and I found that they really were indicating that the compiler was doing something wrong with the typedefs inside the constructed iterator. Ignoring the problem by #ifdefing these out I think may cause problems with the iterator adaptors in some contexts, though I think they will probably work correctly for simple dereferencing and incrementing. To fix (at least partly) these, I found I needed to turn on some of the hacks for BORLANDC in the detail/named_template_params header, specifically the ones to use type_traits::yes_type instead of a bool specialization. I also needed to turn on BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS for the static_assert header; I suspect the BORLANDC #ifdefs I had to turn on are related to this same problem, and they ought to be unified in the config header. Once that was done, the compiler still got itself quite confused by the line in detail/named_template_params.hpp: typedef typename choose_arg_or_default<typename is_default<Arg> ::type>::type Selector; Splitting this up into typedef typename is_default<Arg>::type is_default; typedef typename choose_arg_or_default<is_default>::type Selector; seemed to keep the compiler from getting itself all screwed up. This got me part of the way there, but one of those two Static_asserts was still firing, and it seemed to me correctly so (that is, correctly in that the compiler was behaving incorrectly elsewhere). I came to the conclusion that it was still the same buggy integral constant specialization problem -- if I were to rewrite some of the selector code to use yes_type instead of a bool specialization, I believe I could get it to work, but given that that would have meant some wholesale changes to type_traits, I stopped there. George Heintzelman georgeh(a)aya.yale.edu

1 0

Compose/mem_fun/confusion
by dmoore99atwork 18 Dec '01

18 Dec '01

Hello, I'm trying to explore the compose, bind, and mem_fn libraries. I used a "real" problem I'm having. Given a vector<Trade>, I want to gather a sum of the return values of Trade::volume(). I wound up writing "accumulate_with_op" thusly: template <class _InputIterator, class _Tp, class _UnaryOperation> _Tp accumulate_with_op(_InputIterator first, _InputIterator last, _Tp Init, _UnaryOperation unary_op) { for ( ; first != last; ++first) Init = Init + unary_op(*first); return Init; } And I can call it like this: vector<Trade> li; // ..... sum = accumulate_with_op(li.begin(),li.end(),0,mem_fun_ref (&Trade::volume)) This gives me my sum pretty nicely, so I'm sort of happy... BUT... I tried for a long time to use combinations of for_each, compose_f_gx, and mem_fn to be able to do the Sum (to lead to other things like mean, stddev) into a stateful function object. Something like this: /* broken code, trying to convery my intentions */ MeanValue m1; m1 = for_each(l.begin(), l.end(),compose_f_gx(MeanValue(),mem_fun_ref (&Trade::volume)); cout << m1.result(); I wanted my MeanValue::operator() to be called with the return value from my member function, and I wanted to be able to "capture" the result in a function object i could interrogate afterwards. 1. Am I barking up the wrong tree? accumulate_with_op was pretty easy to write, but my problem seemed straighforward enough to be solved with standard c++ or Boost building blocks. 2. Or I am just using the wrong compiler (MSVC6 SP5)? Thanks, Dave

5 5

Compiler status: win32 question
by kelvinlao 18 Dec '01

18 Dec '01

Does a failure on the Compiler Status chart http://www.boost.org/status/cs-win32.html indicate that a certain compiler cannot use the boost libraries fully? Take for instance, the failure of Visual C++ reported against libs/concept_check/class_concept_fail_expected.cpp: What exactly does this failure mean to a user of the boost libraries? Does it render the boost library or some portion therein unusable by the VC++ programmer? Thanks! -k

2 1

RE: [Boost-Users] Compose/mem_fun/confusion
by Moore, Dave 18 Dec '01

18 Dec '01

Thanks very much for the informative response. Dave > -----Original Message----- > From: Douglas Gregor [mailto:gregod@cs.rpi.edu] > Sent: Friday, December 14, 2001 4:50 PM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Compose/mem_fun/confusion > > > On Friday 14 December 2001 03:06 pm, you wrote: > > Hello, > > > > I'm trying to explore the compose, bind, and mem_fn libraries. I > > used a "real" problem I'm having. Given a vector<Trade>, I want to > > gather a sum of the return values of Trade::volume(). > [...] > > vector<Trade> li; > > // ..... > > sum = accumulate_with_op(li.begin(),li.end(),0,mem_fun_ref > > (&Trade::volume)) > > > > This gives me my sum pretty nicely, so I'm sort of happy... BUT... > > Here are two ways to compute the sum without defining your > own functions or > classes. Both methods use std::accumulate (which, of course, > is what you're > trying to do), but the difference is in the way that > Trade::volume() is > called. > > The first code snippet uses Boost.Bind only. We essentially > create a function > object that takes two arguments, x and y, and then performs > the operation x + > y.Volume(). We get '+' by using the standard library's > plus<int>, and we use > the fact that bind is composable to call Volume on the second > argument. The > code is thus: > > std::accumulate(li.begin(), li.end(), 0, > boost::bind<int>( > std::plus<int>(), > _1, > boost::bind(&Trade::Volume, _2))); > > The other option is philosophically different. Instead of > transforming he > values as we add them, we instead transform the sequence we > are adding using > the Boost Iterator Adaptors library. The transform_iterator adapts an > iterator by applying a function object to each element as it > is dereferenced. > Therefore, the sequence that accumulate "sees" is the result > of calling > Trade::Volume on each member of the underlying sequence. > Here's the code: > > std::accumulate( > boost::make_transform_iterator(li.begin(), > > boost::mem_fn(&Trade::Volume)), > boost::make_transform_iterator(li.end(), > > boost::mem_fn(&Trade::Volume)), > 0); > > I consider this version better (philosphically) because the > accumulation is > over things we can actually accumulate - integers. The > transform_iterator > version is also more reusable code, because now you have the > ability to > transform a sequence of Trade objects (or Trade object > pointers - see the > documentation of mem_fn) into their corresponding trade > volumes, and other > operations become simpler. > > Code was tested under GCC 2.95.3, but I expect it will work for MSVC5. > > Doug > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Unlimited PC-PC calling at Crystal Voice! - Only $1/Mo. > Download your free 30 day trial. Click here. > http://us.click.yahoo.com/Gb1xVB/GxbDAA/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

Simple iterator adaptor example
by Duane Murphy 17 Dec '01

17 Dec '01

I have taken a quick look at iterator adaptor and it seems quite powerful. It seems that iterator_adaptor has two uses. First to adapt one iterator to another. It also seems like it should be able to be used as an interface to other information that has container like qualities that needs an iterator. For example files in directory. Does anyone have an example of how to build one of the later? Not specifically an iterator over files, but the general ability to build an iterator from something that's not an iterator? Thanks for the pointers, ..Duane

1 0

RE: [Boost-Users] MSVC6 and tuple
by Tom Matelich 17 Dec '01

17 Dec '01

Yeah, I also avoid any using in any header, but what are you going to do if you can't compile otherwise? > -----Original Message----- > From: Darin Adler [mailto:darin@bentspoon.com] > Sent: Monday, December 17, 2001 2:15 PM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] MSVC6 and tuple > > > On 12/17/01 12:36 PM, "Tom Matelich" <tmatelich(a)zetec.com> wrote: > > > Any suggestions? > > This may not be what you have in mind, but in my own code I prohibit: > > using namespace boost; > > But in code outside header files, I always use: > > using boost::tuple; > > And the like, except in cases where there are name conflicts. > So I have > includes at the top of my source files, followed by using statements, > followed by code. > > -- Darin > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Need new boots for winter? Looking for a perfect gift for > your shoe loving friends? > Zappos.com is the perfect fit for all your shoe needs! > http://us.click.yahoo.com/ltdUpD/QrSDAA/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

MSVC6 and tuple
by Tom Matelich 17 Dec '01

17 Dec '01

I have a tuple as a member of one of my classes, and it appears, that MSVC 6 requires me to do a using boost::tuple, rather than declaring it with the boost namespace at the var. For this declaration in my header: boost::tuple<int, double> willis; I get the following error: file.h(161) : error C2059: syntax error : '<' file.h(161) : error C2238: unexpected token(s) preceding ';' If I add the using (which I would prefer not to do), the declaration: tuple<int, double> willis; works fine. Any suggestions?

2 1

transitive_closure_test.cpp
by Janos Murvai 17 Dec '01

17 Dec '01

Hi, I compiled this program: transitive_closure_test.cpp with: g++ -ftemplate-depth-30 -I /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/ transitive_closure_test.cpp then I run: Created graph with 13 vertices. transitive_closure Segmentation fault (core dumped) Exit 139 What can I do in this case? Thank you, Janos

2 11

Why not "if (px != rpx) " ?
by Louis Lavery 17 Dec '01

17 Dec '01

Hello, The following is use by the boost shared_ptr assignment operators (see boost\smart_ptr.hpp)... void share(T* rpx, long* rpn) { if (pn != rpn) { // Q: why not px != rpx? A: fails when both == 0 ++*rpn; // done before dispose() in case rpn transitively // dependent on *this (bug reported by Ken Johnson) dispose(); px = rpx; pn = rpn; } } // share ...I curious to know what it means by "fails when both == 0". I mean, I can't see as the sky would fall in if the test was "if (px != rpx)". Am I missing something? Thanks, Louis.

3 7

preprocessor/min and MSVC
by Rodney.Schuler＠ing-dm.com 14 Dec '01

14 Dec '01

I saw the boost preprocessor library and I thought that BOOST_PREPROCESSOR_MIN might help solve a problem in some code that I am maintaining. This code has the naive implementation of MIN and MAX: #define MIN(a,b) ((a)<(b)?(a):(b)) This code also has many (tens of thousands!) of places where a function calls are used as arguments to MIN and MAX like this: foo=MIN(func(args1),func(args2)) The function called is a very long running function. The performance hit taken by three evaluations of the function is a problem I am working to fix. I know the best solution is to add some local variables, and store the results of the functions in them, then use MIN on the local vars. But I'd like to get some Idea of how much performance increase I am likely to get by crawling through the code and fixing all the occurrences of MIN(func(args1),func(args2)) Wondering if BOOST_PREPROCESSOR_MIN had a way to make only two evaluations of func I wrote: #include <iostream> #include <boost/preprocessor/min.hpp> using std::cout; using std::endl; int func(int i) { cout << " func called " << i << endl; return i; } int main () { cout << "result " << BOOST_PREPROCESSOR_MIN(func(1),func(2)) << "\n" << endl; cout << "result " << BOOST_PREPROCESSOR_MIN(func(4),func(3)) << "\n" << endl; return 0; } And my compilers (MSVC 5 sp3 and MSVC 6 sp5) responded thusly: C:\temp\boostminvc5\main.cpp(15) : error C2065: 'BOOST_PREPROCESSOR_IF_BOOLBOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_IF_BOOLBOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_NOR_BOOLBOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_ADDBOOST_PREPROCESSOR_SUBfunc' : undeclared identifier C:\temp\boostminvc5\main.cpp(15) : error C2065: 'BOOST_PREPROCESSOR_SUBfunc' : undeclared identifier C:\temp\boostminvc5\main.cpp(15) : error C2146: syntax error : missing ';' before identifier 'BOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_ADDBOOST_PREPROCESSOR_SUBfunc' C:\temp\boostminvc5\main.cpp(15) : error C2065: 'BOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_ADDBOOST_PREPROCESSOR_SUBfunc' : undeclared identifier C:\temp\boostminvc5\main.cpp(15) : error C2065: 'BOOST_PREPROCESSOR_NOR_BOOLBOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_SUBfunc' : undeclared identifier C:\temp\boostminvc5\main.cpp(15) : error C2146: syntax error : missing ')' before identifier 'BOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_SUBfunc' C:\temp\boostminvc5\main.cpp(16) : error C2146: syntax error : missing ';' before identifier 'BOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_ADDBOOST_PREPROCESSOR_SUBfunc' C:\temp\boostminvc5\main.cpp(16) : error C2146: syntax error : missing ')' before identifier 'BOOST_PREPROCESSOR_BOOLBOOST_PREPROCESSOR_SUBfunc' First, this is a bug report. Second, can anybody answer my question does BOOST_PREPROCESSOR_MIN get around the unnecessary evaluations problem? Thanks -Rodney Rodney.Schuler(a)ing-dm.com

2 1

run test programs...
by Janos Murvai 13 Dec '01

13 Dec '01

Hi, I'm one new user. I tried to run test programs in the : ..../boost_1_26_0/libs/graph/test When I try to compile: g++ -I /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/ adj_matrix_cc.cpp I got many error message (some example from the error messages): What can I do in this case? /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/iterator_adaptors.hpp:817: instantiated from `boost::iterator_adaptor<boost::iterator_adaptor<char *,boost::detail::dir_adj_matrix_out_edge_iter_policies<unsigned int,char *,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int>,boost::filter_iterator_policies<boost::detail::does_edge_exist,boost::iterator_adaptor<char *,boost::detail::dir_adj_matrix_out_edge_iter_policies<unsigned int,char *,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int> >,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int>' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/adjacency_matrix.hpp:326: instantiated from `boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/graph_traits.hpp:38: instantiated from `boost::graph_traits<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/graph_concepts.hpp:177: instantiated from `boost::VertexListGraphConcept<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/concept_check.hpp:41: instantiated from `boost::function_requires<boost::VertexListGraphConcept<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > > >()' adj_matrix_cc.cpp:35: instantiated from here /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/type_traits/composite_traits.hpp:204: incomplete type `boost::is_member_pointer<char *>' does not have member `value' Thank you, Janos

2 1

run test programs..
by Janos Murvai 13 Dec '01

13 Dec '01

Hi, I'm one new user. I tried to run test programs in the : ..../boost_1_26_0/libs/graph/test When I try to compile: g++ -I /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/ adj_matrix_cc.cpp I got many error message (some example from the error messages): What can I do in this case? /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/iterator_adaptors.hpp:817: instantiated from `boost::iterator_adaptor<boost::iterator_adaptor<char *,boost::detail::dir_adj_matrix_out_edge_iter_policies<unsigned int,char *,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int>,boost::filter_iterator_policies<boost::detail::does_edge_exist,boost::iterator_adaptor<char *,boost::detail::dir_adj_matrix_out_edge_iter_policies<unsigned int,char *,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int> >,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int>,boost::detail::matrix_edge_desc_impl<boost::directed_tag,unsigned int> *,boost::multi_pass_input_iterator_tag,int>' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/adjacency_matrix.hpp:326: instantiated from `boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/graph_traits.hpp:38: instantiated from `boost::graph_traits<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/graph/graph_concepts.hpp:177: instantiated from `boost::VertexListGraphConcept<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > >' /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/concept_check.hpp:41: instantiated from `boost::function_requires<boost::VertexListGraphConcept<boost::adjacency_matrix<boost::directedS,boost::no_property,boost::no_property,boost::no_property,allocator<bool> > > >()' adj_matrix_cc.cpp:35: instantiated from here /net/cooler/vol/export/proteome/murvai/CC/BOOST/boost_1_26_0/boost/type_traits/composite_traits.hpp:204: incomplete type `boost::is_member_pointer<char *>' does not have member `value' Thank you, Janos

1 0

boost.regex and submatches
by John Maddock 13 Dec '01

13 Dec '01

>I'm trying to match strings of the form "a&b&c&d" with the following >expression: "(?:([^&]+)&)*([^&]+)". This nicely matches the whole >string but instead of giving me the submatches "a", "b", "c" and "d" >I just get "c" and "d". Could anyone tell me what I'm doing wrong? Look more closely at your expression: it has only *two* marked sub-expressions, $1 gets "overwritten" each time it matches. - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

2 1

boost.regex and submatches
by markus_schoepflin 13 Dec '01

13 Dec '01

Hi all, I'm trying to match strings of the form "a&b&c&d" with the following expression: "(?:([^&]+)&)*([^&]+)". This nicely matches the whole string but instead of giving me the submatches "a", "b", "c" and "d" I just get "c" and "d". Could anyone tell me what I'm doing wrong? Sample code, tested with MSVC6SP5 and Boost 1.26.0: #include <boost/regex.hpp> #include <string> #include <iostream> void main(void) { const char *input ="a&b&c&d"; const boost::regex syntax("(?:([^&]+)&)*([^&]+)"); boost::cmatch matches; if(boost::regex_match(input, matches, syntax)) { for (boost::cmatch::size_type i = 0; i < matches.size(); ++i) std::cout << static_cast<std::string>(matches[i]) << '\n'; } } Tia, Markus

1 0

try building graph library 1.25.1 with MSV6SP5
by acarsac＠yahoo.fr 13 Dec '01

13 Dec '01

Hi all, I' am trying to build the grap library with MSVC6SP5 (not with STLPORT 4.0, the FAQ said it does not work!). What I done: setting up MSVC vars remove space from directories upgrade jam. build boost. (everything ok exectpt ) changes %BOOST_ROOT%/jamfile //////////////////////////////// project-root ; subinclude libs/graph/build ; subinclude status ; //////////////////////////////// change %BOOST_ROOT%/libs/graph/build : //////////////////////////////// subproject libs/graph/build ; SOURCES = graphviz_graph_lex graphviz_digraph_lex graphviz_graph_parser graphviz_digraph_parser ; lib libbgl-viz : ../src/$(SOURCES).cpp : <define>GRAPHVIZ_GRAPH=boost::GraphvizGraph : <include>$(BOOST_ROOT) : debug <inlining>on ; //////////////////////////////// then: cd %BOOST_ROOT% jam -sBOOST_ROOT=. -sTOOLS="msvc" and getting soething like: msvc-Archive-action libs\graph\build\bin\libbgl- viz\msvc\debug\runtime-link-dynamic\libbgl-viz.lib Microsoft (R) Library Manager Version 6.00.8447 Copyright (C) Microsoft Corp 1992-1998. All rights reserved. graphviz_digraph_parser.obj : fatal error LNK1179: invalid or corrupt file: duplicate comdat "?get_v alue@?$property_value_end@U? $property@W4graph_graph_attribute_t@boost@@V?$map@V?$basic_string@DU? $ch ar_traits@D@std@@V?$allocator@D@2@@std@@V12@U?$less@V? $basic_string@DU?$char_traits@D@std@@V?$alloca tor@D@2@@std@@@2@V?$allocator@V?$basic_st2ff4a489" how to fix it, it is the right way to proceed ? Alex

7 15

RE: [Boost-Users] Polymorphic containers (was Re: shared_ptr and inheritance)
by Björn Karlsson 12 Dec '01

12 Dec '01

> From: rz0 [mailto:rz0@yahoo.com] > Hi Bjorn > > Thank you very much for the reply. > > Unfortunately these classes are provided to me and as part of the > requirements, I must be able to work with them. In re-thinking the > problem, it seems that I'm in desperate need of a polymorphic > container - i.e.: > > > Does boost have any polymorphic containers? > > Thanks very much in advance. > > I don't think that polymorphism is the cure - you'll always need to downcast the pointer as the signatures differ. However, there is support in Boost for what you're trying to do - through boost::any. Like I said before, the solution will not be very clean, but it will work. The code snippet below seems to do what you're asking for: #include <iostream> #include <algorithm> #include <vector> #include <Boost\Any.hpp> class A { public: virtual void func1() { std::cout << "A::func1()\n"; }; }; class B : public A { public: void func1() { std::cout << "B::func1()\n"; }; void funcB() { std::cout << "B::funcB()\n"; }; }; class C : public A { public: void func1() { std::cout << "C::func1()\n"; }; void funcC() { std::cout << "C::funcC()\n"; }; }; typedef std::vector<boost::any> AnyVector; void DoStuffWithAny(boost::any& a) { // Try with a B if ( B* pB = boost::any_cast(&a) ) { pB->func1(); pB->funcB(); } // Try with a C else if ( C* pC = boost::any_cast<C>(&a) ) { pC->func1(); pC->funcC(); } // Try with an A else if ( A* pA = boost::any_cast<A>(&a) ) { pA->func1(); } } void DoStuffWithAnyPointer(boost::any& a) { // Try with a B if ( B** ppB = boost::any_cast<B*>(&a) ) { (*ppB)->func1(); (*ppB)->funcB(); } // Try with a C else if ( C** ppC = boost::any_cast<C*>(&a) ) { (*ppC)->func1(); (*ppC)->funcC(); } // Try with an A else if ( A** ppA = boost::any_cast<A*>(&a) ) { (*ppA)->func1(); } } int main(int argc, char* argv[]) { AnyVector aVector; A a; B b; C c; aVector.push_back(a); aVector.push_back(b); aVector.push_back(c); // Do interesting things std::for_each(aVector.begin(), aVector.end(), DoStuffWithAny); AnyVector anotherVector; anotherVector.push_back(new A); anotherVector.push_back(new B); anotherVector.push_back(new C); // Do interesting things std::for_each(anotherVector.begin(), anotherVector.end(), DoStuffWithAnyPointer); return 0; } Another approach would be to provide adapters, but I'm guessing that wouldn't be worth the trouble. HTH, Bjorn Karlsson [Non-text portions of this message have been removed]

2 1

Tokenizer
by Paul Grenyer 11 Dec '01

11 Dec '01

Hi All! I'm using tokenizer in a project. Is there a way to get the number of tokens that have been tokenized? Thanks Paul Paul Grenyer pjgrenyer(a)iee.org

1 0

Boost.Threads Win32 Implementation
by bkarsjens 11 Dec '01

11 Dec '01

The first thing I discovered when trying to get threads working is that the -mthreads option was not being used in jam. I added the following to the gcc-tools.jam file. I'm not totally sure it's right -- it's needed for mingw32, but I don't know if it is necessary for cygwin. if $(NT) { flags gcc CFLAGS <threading>multi : -mthreads ; flags gcc LINKFLAGS <threading>multi : -mthreads ; } Adding that let's gdb actually work on it... It doesn't crash deep in the bowels of thread exiting in some kernel library routine. Although it still crashes in on_thread_exit doing handlers->push_front(func). Actually, it crashes in some STL stuff, but that's I'm not sure why, I'm not that good with gdb yet. After digging through the implementation of threadmon.cpp, I realized that (unless I missed something) on_thread_exit was always called with the same argument, which is the address of cleanup in tss.cpp. Therefore all of the stuff in threadmon.cpp for keeping a list of functions registered with on_thread exit were not really needed, it would always have a list of the same pointer. So why not just keep that pointer and call it on thread exit. I also discovered that DllMain wasn't getting called at all because it wasn't defined as extern "C". This drastically simplifies threadmon.cpp: // threadmon.cpp : Defines the entry point for the DLL application. // #define BOOST_THREADMON_EXPORTS #include "threadmon.hpp" #ifdef BOOST_HAS_WINTHREADS #define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers #include <windows.h> #ifdef BOOST_MSVC # pragma warning(disable : 4786) #endif typedef void (__cdecl * handler)(void); namespace { handler exit_handler; } #if defined(__BORLANDC__) #define DllMain DllEntryPoint #endif extern "C" BOOL APIENTRY DllMain(HANDLE module, DWORD reason, LPVOID) { switch (reason) { case DLL_PROCESS_ATTACH: case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: { if (exit_handler) (*exit_handler)(); } break; } return TRUE; } int on_thread_exit(void (__cdecl * func)(void)) { exit_handler = func; return 0; } #endif // BOOST_HAS_WINTHREADS Note that the above was not copied directly, but has had some editing. I think I transcribed it correctly, but maybe I missed a semicolon or something. Also, in tss.cpp, cleanup may be called without any handlers registered... I'm not sure if this was always the case, or if I introduced this case, so the cleanup function needs to do an if(handlers) check before actually trying to call them. And now the tests pass! Wheee! One more thing. I'm still not convinced for the need of the dll. The issue is needing to know when a thread has exited, and I think that could be done by an object that was destructed in a thread-proxy function. Since you are already using a thread_proxy function, I'm wondering if you considered this approach and if so, why you rejected it.

2 3

RE: [Boost-Users] Re: operator<< for boost::any
by Björn Karlsson 11 Dec '01

11 Dec '01

> From: Patrick Guio [mailto:patrick.guio@fys.uio.no] > I have another comment more general about the any class > The declaration > placeholder * content; > in the any class might be public or private depending on the > value of the > value of the define BOOST_NO_MEMBER_TEMPLATE_FRIENDS. > Is it safe? No, it's not safe. It's there for a good reason though - some compilers does not support the (required) friend declaration. Bjorn Karlsson [Non-text portions of this message have been removed]

1 0

Re: operator<< for boost::any
by Patrick Guio 10 Dec '01

10 Dec '01

On Sun, 9 Dec 2001, assaflavieatwork wrote: > If all you want to do is output the value inside the 'any' you can > add a virtual member to the place_holder/holder classes (inside any's > impl) that will output to a ostream&. That is exactly my need > in place_holder: > virtual ostream& write(ostream&) = 0; You mean placeholder? I have added this declaration as a pure virtual function in the queries part. class placeholder { ... public: // queries ... virtual ostream& write(ostream&) = 0; }; > in holder: > ostream& write(ostream& o) { o << held; }; > I have added the declaration in the derived class holder from the abstract base class placeholder template<typename ValueType> class holder : public placeholder { ... public: // queries ... ostream& write(std::ostream& os) { os << held; } public: // representation ValueType held; }; > outside any: > std::ostream& operator << (std::ostream& out, const any& value) { > return value.write(out); > }; I don't understand how this can work since the class any contains a pointer to an object of class placeholder. This object has a member function write but not the class any itself? I have another comment more general about the any class The declaration placeholder * content; in the any class might be public or private depending on the value of the value of the define BOOST_NO_MEMBER_TEMPLATE_FRIENDS. Is it safe? #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS private: // representation template<typename ValueType> friend ValueType * any_cast(any *); #else public: // representation (public so any_cast can be non-friend) #endif placeholder * content; }; > > But that of course means changing the any.hpp file which of course > isn't something everyone is willing to do... Why not including a simple overloading of the << operator? > > Anyway, it won't help you if you want to read the any back from an > istream. You'll have to write some type information to the stream or > else you'll just interpret everything as a string. > I understand that but that is not what I want to do. Sincerely Patrick Guio

2 1

RE: [Boost-Users] Re: shared_ptr and inheritance
by Björn Karlsson 10 Dec '01

10 Dec '01

> From: rz0 [mailto:rz0@yahoo.com] > > > > > >VC++ 6.0 flags the above lines with a conversion error. > > > > > >Is there any way to resolve this? > > > > Can you just define b and c as boost::shared_ptr<A>? > > Hi Jon > > Thank you very much for the response. Unfortunately this will cause > the same problem that I ran into with std::auto_ptr and that is > methods funcB and funcC which are exclusive to B and C are not > allowed to be called. > > Take care > RZ > It seems to me that the problem is in the design - you're trying to use inheritance for the convenience of placeholding (and maybe insulation). That won't work (as you've seen). Even with a compiler that allows the code to compile (those that support member templates will) you will not get the behaviour that you want - funcB and funcC can never be called (from client code). The reason that the code compiles cleanly is that the conversion from B* or C* to A* is valid - but there's no way you can dynamically change the static type of "boost::shared_ptr<A> aptr;". If you really need to get this to work, it is still possible: You could use boost::any, and any_cast through all the possible types. This, however, is not very flexible, and IMO not very readable or maintainable. Regards, Bjorn Karlsson [Non-text portions of this message have been removed]

2 1

shared_ptr and inheritance
by rz0 10 Dec '01

10 Dec '01

Hello I have the following scenario: #include <iostream> #include <boost/smart_ptr.hpp> class A { public: virtual void func1() { std::cout << "A::func1" << std::endl; } }; class B : public A { public: void func1() { std::cout << "B::func1" << std::endl; } void funcB() { std::cout << "B::funcB" << std::endl; } }; class C : public A { public: void func1() { std::cout << "C::func1" << std::endl; } void funcC() { std::cout << "C::funcB" << std::endl; } }; class Holder { boost::shared_ptr<A> aptr; public: void setclass(boost::shared_ptr<A> a) { aptr = a; } void callfunc() { aptr->func1(); } }; int main() { Holder holder; boost::shared_ptr b(new B()); boost::shared_ptr<C> c(new C()); holder.setclass(b); //<------- holder.setclass(c); //<------- holder.callfunc(); return 0; } VC++ 6.0 flags the above lines with a conversion error. Is there any way to resolve this? Thanks very much in advance.

2 3

Can't build Python-lib with VC
by swbuddy2001 08 Dec '01

08 Dec '01

Hi all, i'm trying to build the Boost-Python library (Version 1.26.0) with VS6 using SP6 and i get the following ErrorMsg. Compiling... types.cpp ..\..\..\boost/bind/mem_fn_template.hpp(135) : error C2562: '()' : 'void' function returning a value ..\..\..\boost/bind/mem_fn_template.hpp(133) : see declaration of '()' ..\..\..\boost/bind.hpp(735) : see reference to function template instantiation 'void __thiscall boost::_mfi::cmf1<void,class boost::python::detail::type_object_base,struct _object *>::operator () (class boost::python::detail::type_object_base *const & ,struct _object *) const' being compiled Any suggestions what i can do to get types.cpp compiled? Thanks in advance, Jürgen

2 4

explanation about cyclic_ptr in smart_ptr
by ma_ting_chong 06 Dec '01

06 Dec '01

How do cyclic_ptr work in the smarttest.zip in smart_ptr library?

1 0

Need Digest
by Daryle Walker 05 Dec '01

05 Dec '01

I guess Yahoo Groups had a data burp on 21 Nov 2001, because I didn't get digest 22. Could anyone send it to me? -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT mac DOT com

1 0

OT: Is there a forum for Loki anywhere on the 'net?
by Gooch, Allen 04 Dec '01

04 Dec '01

I know that pieces of Loki are being reviewed for inclusion into Boost, but I was wondering if there is any sort of forum for questions regarding the use of Loki itself, specifically Loki::SmartPtr. Please respond by email to avoid list clutter, unless it relates to boost use. TIA, Allen Gooch

2 1

Re: [Boost-Users] Re: Installing on Windows 95 with Mingw32 1.1
by John Maddock 02 Dec '01

02 Dec '01

>ISTR that when I tried to use boost.threads in the past on Win98, I >encountered problems with the TSS code as well - with MSVC. I didn't see the >page faults since a catch(...) handler on MSVC eats them but the results >were worse than that - the machine locked up in about half of the cases, in >the other half the thread that faulted died without warning. I haven't seen that. >I think that it's possible that the problem is not gcc-specific. Note that >both your successes use pthreads-win32, not the native win32 implementation >of Boost.Threads. the tests run fine using the win32 threads API as well (at least for me), the reason I used pthreads-win32 was to make the tests more directly comparable to cygwin (which has it's own pthreads API). - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

1 0

graph library compilation on VC++
by zhang3284＠yahoo.com 02 Dec '01

02 Dec '01

I'm new to BGL and studying the examples provided with the library. Here is a problem I'm having: I compiled a program, for example,dfs- example.cpp, it was fine. And then I changed the program a little bit, and tried to recompile it, I got the following error: boost\iterator_adaptors.hpp(845) : fatal error C1001: INTERNAL COMPILER ERROR Then I tried Rebuild All or cleaned the project first, and then compiled it. It became OK again. I'm using VC++ 6.0 SP5. Any comment would be appreciated. Thanks. Yingjun Zhang

2 1

operator<< for boost::any
by Patrick Guio 01 Dec '01

01 Dec '01

Dear all, I am trying to use the any class in a project. I would need to print elements of a vector<any>. I have come to the following solution as an example: template<class T> inline ostream& operator<<(ostream &os, const vector<T> &v) { vector<T>::const_iterator iter(v.begin()); for (int c(0), n(v.size()); c<n-1; c++) os << *iter++ << ','; return os << *iter; } typedef vector<bool> vectb; int main() { vector<any> values; double f(2.0); string s("hello"); int i(100); bool b(false); vectb vectbool; vectbool.push_back(true); vectbool.push_back(false); vectbool.push_back(true); vectbool.push_back(true); vectbool.push_back(false); vectbool.push_back(true); values.push_back(f); values.push_back(s); values.push_back(i); values.push_back(b); values.push_back(vectbool); for (vector<any>::iterator i(values.begin()), last(values.end()); i!=last; i++) { if (any_cast<bool>(i)) cout << *any_cast<bool>(i) << endl; else if (any_cast<int>(i)) cout << *any_cast<int>(i) << endl; else if (any_cast<float>(i)) cout << *any_cast<float>(i) << endl; else if (any_cast<double>(i)) cout << *any_cast<double>(i) << endl; else if (any_cast<string>(i)) cout << *any_cast<string>(i) << endl; else if (any_cast<vectb>(i)) cout << *any_cast<vectb>(i) << endl; } } But I would like a more general solution without to make assumptions about the type. Do you have any ideas? Another point is that I cannot figure out how to convert the solution below in terms of a friend ostream& operator<<(ostream &os, const any &rhs) I cannot get this compiled with g++ v 2.95 friend ostream& operator<<(ostream &os, const any &rhs) { return os << *any_cast<bool>(rhs); } Sincerely, Patrick ====================================================================== Patrick Guio Institute of Physics, University of Oslo P.O. box 1048, Blindern, N-0316 Oslo Tel : (+47) 22 84 40 60 - Fax : (+47) 22 85 56 71 E-mail : patrick.guio(a)fys.uio.no URL : http://folk.uio.no/~patricg

4 4

Re: Installing on Windows 95 with Mingw32 1.1
by John Maddock 01 Dec '01

01 Dec '01

>I got the command line gdb to run, but what a pain. I'm researching >both the GUI version as well as the JIT versions available for >mingw. They may help out. However, the command line version just >stranded me with no clear idea why things were failing, so I don't >know if the other debuggers will be much help. If it helps, I tried debugging the thread code with the latest cygwin GUI debugger (which is almost usable BTW), but still couldn't figure out what the issue was. I also tried with vc6+pthreads-win32 and Borland+pthreads-win32 and both of those check out OK, in the latter case I was able to build both boost.threads and pthreads-win32 with Borlands Codeguard support enabled, and there were no memory related errors, so I think this is something very specific to gcc. BTW I also see a page fault when building with gcc3.01 on Linux - this time the fault goes away if I build in release mode, so I suspect there is an assertion being triggered somewhere, and it's the assertion that's dying. I haven't got any further than that though. - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

3 3

Installing on Windows 95 with Mingw32 1.1
by karsjens+yahoo＠visionary.com 30 Nov '01

30 Nov '01

Since I had quite a bit of trouble getting started with boost, I though i would document my difficulties so the install process can be improved and other users having similar difficulties might benefit from my experience. I have placed my story on the boost wiki in the topic InstallingOnMingw32Windows95 Direct url: http://www.crystalclearsoftware.com/cgi-bin/boost_ wiki/wiki.pl?InstallingOnMingw32Windows95 I hope this is helpful to somebody. -- Brad Karsjens

3 4

regex and tokenizer, something wrong with namspace ?
by John Maddock 30 Nov '01

30 Nov '01

>I am a new user of the boost library (Actually with VC6 SP5 and stlport 4.0). Everything goes well when I use tokenizer and regexp in separated programs. But when I want to use the regex and the tokenizer library together I can not compile. for example, if I take the $(BOOST_ROOT)/libs/tokenizer/examples.cpp from John R. Bandela and just add the include line: #include <boost/regex.hpp> the compiler gives me this error: < regex and tokeniser appear to use different workarounds for the broken VC6 namespace support, and these seem to conflict, IMO regex is using the correct fix - or at least the one we discussed during the early days of boost, but then I would say that :-) - John Maddock http://ourworld.compuserve.com/homepages/john_maddock/

1 0

warning: unknown rule split
by John Merrells 29 Nov '01

29 Nov '01

I just downloaded boost and the jam.exe on the build page. Executing jam -ftools/build/allyoubase.jam -sTOOLS="msvc" on win2k with msvc 6 I get a screenful of 'warning: unknown rule split'. Anyone experienced this? jam version problem? John [Non-text portions of this message have been removed]

3 5

RE: [Boost-Users] graph library
by Jim.Hyslop 29 Nov '01

29 Nov '01

Ihsan Ali Al Darhi [SMTP:iad929@joinnet.com.jo] wrote: > Can someone of you point me to a good book or URL on graph theory? Ineed > this to understand the BGL. Please. I've found Robert Sedgewick's book "Algorithms in C++" to be quite useful. He has several chapters devoted to graph algorithms. He explains some of the basics, then demonstrates how to implement the algorithms. There are a lot of other algorithms covered as well (string processing, searching and sorting algorithms, geometric algorithms, and so on). -- Jim

1 0

problem compiling boost.function w/ g++ 2.95.3
by Darin Buck 29 Nov '01

29 Nov '01

when trying to compile the following code (cut from the boost.function test suite): #include <boost/bind.hpp> #include <boost/function.hpp> #include <iostream> #include <string> #include <functional> struct X { X(int v) : value(v) {} int twice() const { return 2*value; } int plus(int v) { return value + v; } int value; }; int main() { using namespace boost; boost::function<int, X*> f1(&X::twice); X one(1); cout << "f1(one) = " << f1(&one) << endl; return 0; } _____________________________________________ i get the following errors: /usr/local/include/boost/function/function_template.hpp: In function `static int boost::detail::function::function_obj_invoker1<int (X::*) () const,int,X *>::invoke(boost::detail::function::any_pointer, X *)': /usr/local/include/boost/function/function_template.hpp:689: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::assign_to<int (X::*)() const>(int (X::* &)() const, boost::detail::function::function_obj_tag)' /usr/local/include/boost/function/function_template.hpp:618: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::assign_to<int (X::*)() const>(int (X::* &)() const)' /usr/local/include/boost/function/function_template.hpp:463: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::function1<int (X::*)() const>(int (X::* &)() const)' /usr/local/include/boost/function.hpp:459: instantiated from `boost::function<int,X *,boost::detail::function::unusable,boost::detail::function::unusable, boost::detail::function::unusable,boost::detail::function::unusable,bo ost::detail::function::unusable,boost::detail::function::unusable,boos t::detail::function::unusable,boost::detail::function::unusable,boost: :detail::function::unusable>::function<int (X::*)() const>(int (X::* &)() const)' hello.C:21: instantiated from here /usr/local/include/boost/function/function_template.hpp:272: pointer to member function called, but not in class scope /usr/local/include/boost/function/function_template.hpp:272: warning: control reaches end of non-void function `boost::detail::function::function_obj_invoker1<int (X::*)() const,int,X *>::invoke(boost::detail::function::any_pointer, X *)' /usr/local/include/g++-3/stl_alloc.h: At top level: /usr/local/include/g++-3/stl_alloc.h: In instantiation of `allocator<int (X::*)() const>': /usr/local/include/boost/function/function_base.hpp:131: instantiated from `boost::detail::function::functor_manager<int (X::*) () const,allocator<boost::function_base> >' /usr/local/include/boost/function/function_template.hpp:691: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::assign_to<int (X::*)() const>(int (X::* &)() const, boost::detail::function::function_obj_tag)' /usr/local/include/boost/function/function_template.hpp:618: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::assign_to<int (X::*)() const>(int (X::* &)() const)' /usr/local/include/boost/function/function_template.hpp:463: instantiated from `boost::function1<int,X *,boost::empty_function_policy,boost::empty_function_mixin,allocator >::function1<int (X::*)() const>(int (X::* &)() const)' /usr/local/include/boost/function.hpp:459: instantiated from `boost::function<int,X *,boost::detail::function::unusable,boost::detail::function::unusable, boost::detail::function::unusable,boost::detail::function::unusable,bo ost::detail::function::unusable,boost::detail::function::unusable,boos t::detail::function::unusable,boost::detail::function::unusable,boost: :detail::function::unusable>::function<int (X::*)() const>(int (X::* &)() const)' hello.C:21: instantiated from here /usr/local/include/g++-3/stl_alloc.h:750: `allocator<int (X::*)() const>::address(int (X::* &)() const) const' has already been declared in `allocator<int (X::*)() const>' make: *** [hello.o] Error 1 ___________________________________ this code should compile (its just copied from the test code) and my compiler setup should work according to the boost compiler status page. Any ideas what i'm doing wrong? -Darin Buck

2 2

regex and tokenizer, something wrong with namspace ?
by acarsac＠yahoo.fr 28 Nov '01

28 Nov '01

Hi, I am a new user of the boost library (Actually with VC6 SP5 and stlport 4.0). Everything goes well when I use tokenizer and regexp in separated programs. But when I want to use the regex and the tokenizer library together I can not compile. for example, if I take the $(BOOST_ROOT)/libs/tokenizer/examples.cpp from John R. Bandela and just add the include line: #include <boost/regex.hpp> the compiler gives me this error: Compiling... examples.cpp c:\program files\microsoft visual studio\vc98 \include\boost\token_functions.hpp(264) : error C2668: 'ispunct' : ambiguous call to overloaded function c:\program files\microsoft visual studio\vc98 \include\boost\token_functions.hpp(257) : while compiling class- template member function 'bool __thiscall boost::char_delimiters_separator<char,class _STL::char_traits<char> >::is_ret(char) const' Error executing cl.exe. examples.exe - 1 error(s), 0 warning(s) any idees ? Alexandre

3 7

Typelists.
by jamescurran＠mvps.org 28 Nov '01

28 Nov '01

Over on the Boost Developer group, there a lot of talk about how to best implement a typelist. Just so I can follow that discussion, could someone give me the basic thumbnail sketch of what exactly a typelist is, and what they are used for?

3 2

Real-world applications using Boost - results
by Björn Karlsson 27 Nov '01

27 Nov '01

I recently posted a question about "real-world" use of Boost. The (surprisingly few) answers I received can be found at the end of the e-mail. I think it is safe to say that the usage is more widely spread than the answers indicate. [Note: I have excluded the names from the e-mails, although not explicitly asked to do so.] Summary: There were replies from 8 Boosters. It seems that the lightweight utility classes are the most popular, likely due to the fact that their impact on existing systems is easily manageable. Thank you for your answers! Bjorn Karlsson Reply ////////////////////////////////////////////////////////////////////////// Using some small parts of it. Selected because it lets you pick and chose things to use from a large set of (relatively) small components/tools rather than ending up "buying into" some grand scheme of things. Well designed small interfaces rather than including the kitchen sink, making it easier for people to pick up/maintain code later.... Did what I needed to do at the time.... Note that the things I have elected to use so far have been small and intended to reduce the risk of mistakes (eg operators, traits) rather than anything vast. Reply [translated] ////////////////////////////////////////////////////////////////////////// We have just started to use Boost for converting a Python prototype to C++. The experience is still limited, but the results after a few days of work are very good. Reply ////////////////////////////////////////////////////////////////////////// I'm using Boost heavily in FEMTown (www.femtown.org) FEMTown is an open-source finite-element framework in development. We're using Boost because it provides stable and slim functionality that helps us making FEMTown more efficient, flexible and robust. (although our choice of C++ for a scientific application is even kinda controversial) Reply ////////////////////////////////////////////////////////////////////////// At this moment, I'm using the Boost lexical_cast in one of our commercial software products (Pilot - see http://www.leitch.com/custserv/products.nsf/lookup/CCS-PILOT) I needed to convert from integers to text for transmission across the network, then back from text to integer value. I had been using strstream, but the lexical_cast wrapped all the complexity up for me. I chose Boost because it's portable (our software runs on Windows NT and on embedded software using gcc). I knew there is a good chance that lexical_cast will become a standard keyword. As I learn more about the various libraries that are available, I will likely find appropriate places to use them. Reply ////////////////////////////////////////////////////////////////////////// My group is currently using Boost on one project as an experiment. We do cross-platform Macintosh/Windows development and it was valuable to have a tested library that worked on our two main development platforms. We have been phasing different parts of Boost in as come across problems that Boost will solve. As a community I find Boost a source of best practices that I have tried to implement in our workplace. Reply ////////////////////////////////////////////////////////////////////////// We've been using Boost at Zetec for over two years. Initially just for shared_ptr, but since expanding to lexical_cast, iterator_adaptors, tokenizer, and others. If you need any other info, let me know. Reply ////////////////////////////////////////////////////////////////////////// I am starting a new project using boost. It is a financial risk-management engine. I cannot tell you a lot about it yet. We are a team of 8 developers, 4 developing the backend and 4 developing the interfaces. The product will hopefully be a big success in the financial world as it is developed in cooperation with some the best people of the financial industry. It is a 12 months development effort using the XP development process. boost will be used to provide some utility classes (smart pointers, anys, threads ... ). The engine will run on Solaris and Linux. A future version on Windows may exist in the future. Reply ////////////////////////////////////////////////////////////////////////// We've used small parts of Boost in a digital video distribution back-end system; the system was developed by a client of us(us=CMG). If you want names in your summary I'd have to ask for permissions from them.

1 0

(no subject)
by Paul Grenyer 25 Nov '01

25 Nov '01

Paul Grenyer pjgrenyer(a)iee.org

1 0

"referenced symbol not found" when loading modules
by dlrubin＠yahoo.com 25 Nov '01

25 Nov '01

I'm getting a "refernced symbol not found" error when loading modules compiled with Boost. I tried using boost using this example code: #include <stdio.h> #include <string> #include <boost/python/class_builder.hpp> namespace { std::string greet() { return "hello, world"; } int square(int number) { return number * number; } } namespace python = boost::python; BOOST_PYTHON_MODULE_INIT(example) { try { // Create an object representing this extension module. python::module_builder this_module("example"); // Add regular functions to the module. this_module.def(greet, "greet"); } catch(...) { python::handle_exception(); // Deal with the exception for Python } } and when I try importing into python, here's the error I get: Python 2.1.1 (#5, Nov 22 2001, 14:04:45) [GCC 2.95.2 19991024 (release)] on sunos5 Type "copyright", "credits" or "license" for more information. >>> import example Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: ld.so.1: python: fatal: relocation error: file ./example.so: symbol handle_exception__Q25boost6pythonv: referenced symbol not found Any suggestions? thanks, Daniel

1 0

Introducing Me
by Paul Grenyer 24 Nov '01

24 Nov '01

Dear All I don't know if this is the appropriate thing to do here (I'm sure the moderator will filter me out if it isn't), but I failed to introduce myself on other lists and with hindsight I think it would have been better if I had. I've been programming in C++ for about 18 months, since I left university and started working. I was introduced to the C++ standard library and boost libraries a few months ago by a member of the ACCU. I have just started a new job writing distributed software using the C++ standard library and the ATL and I'm making as much use of boost as possible. Previous to that I was writing windows software to control dot markers and laser markers using the MFC. So, I am very new to boost and am not expecting to be able to contribute much for a while and I'll no doubt need the odd nudge in the right direct. Thanks Paul Paul Grenyer pjgrenyer(a)iee.org

1 0

Re: [boost] how to get a *real* copy of a boost-python object that supports virtual function
by Phil Austin 24 Nov '01

24 Nov '01

(I'm posting to both boost and boost-users, but I'm assuming we're supposed to move this kind of discussion to Boost-Users(a)yahoogroups.com?) dkottowk(a)yahoo.com writes: [snip] > my question is, how do i get a copy of PyGenome_Callback, > which also is a copy of the python-side of the object ? I'd also be interested in a pointer to an elegant way to do this, as well as an example of a from_python function that converts PyObject* to PyGenome_Callback. Brute force does work for me -- i.e. if you need the derived class and can't construct the object in Python code, you can call the derived constructor from the C++ side like this: PyObject* theMod=PyImport_ImportModule("mymodule"); PyObject* theDict=PyModule_GetDict(theMod); py::ref theRef(theDict); py::dictionary modDict(theRef); py::ref constructor=bDict.get_item(py::string("theObject").reference()); PyObject* theInstance=PyObject_CallObject(constructor.get(),0); This was ugly enough so that I added a python wrapper around my extension to construct the derived objects I needed in Python and pass them back to C++. Phil

1 0

boost tokenizer
by pjgrenyer＠iee.org 23 Nov '01

23 Nov '01

Dear All I'm using the boost tokenizer to tokenise lines similar to this one: first_initial |23|1| This gives me: first initial 23 1 but what I actually want is: first_initial 23 1 Does anyone know how to get it to ignore the underscore? Thanks Paul

3 2

passing data to a thread
by d33pmind＠yahoo.fr 23 Nov '01

23 Nov '01

How can I pass data to a thread ? Why does the boost::thread's constructor takes a boost::function0<void> as parameter, instead of a boost::function1<void> which would have allowed to pass it a pointer to a thread safe structure ? Julien.

2 1

core dump when invoking jam
by d33pmind＠yahoo.fr 23 Nov '01

23 Nov '01

On a Linux Mandrake 8.1 (i586), I succesfully built jam, but when I invoke it I got no output except a core dump. Has anyone encountered the same problem ? I compiled it with gcc 3.0.1, and modified gcc-tools.jam to use gcc- 3.0.1 and g++-3.0.1 instead of gcc and g++ (which are 2.96). Thanks. Julien.

2 1

What's safe_bool?
by mr_lilirong＠yahoo.com 23 Nov '01

23 Nov '01

Hi, The following code is excerpted from Boost.Function. I just don't unstanding it. Why use "safe_bool"? What's the advantage? Can any one explain it to me? Thanks. // code from <boost/function/function_base.hpp> // ===> private: struct dummy { void nonnull() {}; }; typedef void (dummy::*safe_bool)(); public: operator safe_bool () const { return (this->empty())? 0 : &dummy::nonnull; } safe_bool operator!() const { return (this->empty())? &dummy::nonnull : 0; } // code from <boost/function/function_base.hpp> // <===

2 2

aCC compilator
by lokys1976＠yahoo.com 22 Nov '01

22 Nov '01

Is it possible using aCC A.03.27 to use boost libraries? When I try to compile using boost examples, it dosn't understand "using namespece std" and so on, when I try to use aCC -AA than it can not find some libraries. Any suggestions how must I use aCC with boost libraries is welcomed very much thank you Paulius

2 1

Threads on MSVC 6.0
by brian_todoroff＠yahoo.com 22 Nov '01

22 Nov '01

I've been trying for a few hours now to get the threads lib examples to compile. I built the libraries with jam and all but python built correctly. When I create a new Win32 console application and copy the code ( See end of message from the thread class example and attempt to compile I get: ===================Start Error --------------------Configuration: threadtest - Win32 Debug----------- --------- Compiling... threadtest.cpp c:\projects\boost\threadtest\threadtest.cpp(27) : error C2228: left of '.join' must have class/struct/union type Error executing cl.exe. Creating browse info file... threadtest.exe - 1 error(s), 0 warning(s) ===================End Error Can't figure out what I'm doing wrong. Thanks for any help. Brian Todoroff ========================Start Code (to end) #include <boost/thread/xtime.hpp> #include <boost/thread/thread.hpp> #include <iostream> struct thread_alarm { thread_alarm(int secs) : m_secs(secs) { } void operator()() { boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); xt.sec += m_secs; boost::thread::sleep(xt); std::cout << "alarm sounded..." << std::endl; } int m_secs; }; int main(int argc, char* argv[]) { int secs = 5; std::cout << "setting alarm for 5 seconds..." << std::endl; boost::thread thrd(thread_alarm(secs)); thrd.join(); // Line 27 - Error here return 0; }

2 1

breadth_first_searchable graph, without invalidable vertex descriptors
by cristipp＠ics.uci.edu 21 Nov '01

21 Nov '01

Hello, I am trying to use the BCG as backbone for a ControlFlowGraph in a compiler project. It seems that I cannot use BCG for this task because of the follow contradicting (from BCG point of view) requirements: 1. I want to be able to breadth_first_search through my graph. 2. I want to be able to keep descriptors to vertices 'for ever' so I can refer a specific vertex at any given time (for removal or whatever other reasons). To implement requirement 1 my adjacency_list should have its VertexList of type vecS. To implement requirement 2 my adjacency_list should have its VertexList of type listS. Unfortunately those are mutualy exclusive and it seems that BCG is unsuited for the job. But I can't really think of a decent generic graph library unable to support those requirements. After all, it's all about being able to use basic graph traversals on randomly mutating graphs. STL has the list which has those nice properties, why a graph library should be different?! Perhaps I am missing something and I am asking for help: how should I declare my graph and how can I do a bfs on it? Thanks in advance, Cristi

2 5

RE: [Boost-Users] question about any class ...
by scleary＠jerviswebb.com 10 Nov '01

10 Nov '01

> any is really a powerful class, but sometimes I would also be > able to know directly the type stored into it without 'guessing', for > example to use it in template code. > What I would like to have is something as > > type_info::real_type for the value hidden into any (not legal > C++, maybe > legal C++0x ?), This actually wouldn't help you, still. How would the declaration look? typeof() wouldn't work, either... > or, alternatively, virtual template functions (again not > legal C++) to be > able to write generic > code depending on both hidden value's type and types 'from the outside > world' (sorry cannot explain it better :-( than this) I have run into this same problem. To re-phrase it, Gianni is trying to do an "operation" on a contained value. 'any' supports the "operations" of copying and destruction as-is; manual modification of 'any' could support other "operations" (this is what Gianni means when he talks about "visiting" the any class, below): any { ... void f() { if (content) content->f(); } }; any::placeholder { ... virtual void f() = 0; }; any::holder<...> ... { ... virtual void f() { held.f(); } }; The problem is how to do this generically (i.e., provide a solution for any "operation"). Another way of looking at this is to force 'any' to call a function that is overloaded on the type of the contained value. Strictly speaking, this isn't possible because 'any' makes the compile-time info into run-time info. > I have tried various approaches, but if I 'visit' the any > class adding a > virtual function to reach hidden value I loose generic type > information > (lack of virtual template functions) from the outside while from the > outside of any > I cannot obtain directly the type of the hidden value ... > > is there a way to do the above ? I have not been successful. Again, 'any' changes compile-time information into run-time information, and to go the other way is just not possible in this language. You could take a "nasty-hack" approach, if you *really* wanted to: 1) Add an 'any_base' class with a virtual function 2) Extend 'any' to return an 'any_base *' referring to the held value, using C-cast notation (derived-to-base when possible, reinterpret when not) 3) Derive your held value types from a common base class 'my_base', which was derived from 'any_base'; add the operations you want to perform to 'my_base' 4) Call the 'any' function returning 'any_base *', downcasting it to 'my_base'. This will result in undefined behaviour if the contained value is not actually derived from 'my_base' (because of the reinterpret_cast behaviour in step 2) I *think* that will work (never tried it). Messy, though, and IMO not generic enough to mess with. Alternatively, you could: 1) Visit 'any'/'any::placeholder'/'any::holder' to provide: void any::action(any which) { content->action(which); } virtual void any::holder::action(any which) { any_action(held, which); } 2) Declare a function 'any_action(T, any)', where the any parameter designates which "operation" to perform. Overloading is then possible on T. Also, where T is a user-defined type, Koenig lookup can be used (abused?) to create different (non-overlapping) sets of "operations". Just some thoughts. Again, I've never tried it. -Steve

2 1

question about any class ...
by Gianni Luciani 10 Nov '01

10 Nov '01

Hi, any is really a powerful class, but sometimes I would also be able to know directly the type stored into it without 'guessing', for example to use it in template code. What I would like to have is something as type_info::real_type for the value hidden into any (not legal C++, maybe legal C++0x ?), or, alternatively, virtual template functions (again not legal C++) to be able to write generic code depending on both hidden value's type and types 'from the outside world' (sorry cannot explain it better :-( than this) I have tried various approaches, but if I 'visit' the any class adding a virtual function to reach hidden value I loose generic type information (lack of virtual template functions) from the outside while from the outside of any I cannot obtain directly the type of the hidden value ... is there a way to do the above ? Gianni Luciani

2 2

Re: any question
by Kevlin Henney 09 Nov '01

09 Nov '01

> From: Thomas Matelich <toms-mailing-lists(a)home.com> > >In the docs, it uses a function called any_ptr, but I don't think it >exists. Could someone please explain? Yes, nothing more elaborate than a typo, I'm afraid! Should be any_cast. Kevlin ____________________________________________________________ Kevlin Henney phone: +44 117 942 2990 mailto:kevlin@curbralan.com mobile: +44 7801 073 508 http://www.curbralan.com fax: +44 870 052 2289 Curbralan: Consultancy + Training + Development + Review ____________________________________________________________

2 1

casting shared_ptr while preserving use_count..
by John Liberty 09 Nov '01

09 Nov '01

I'd like to essentially downcast (to derived) from a base class with virtual methods while preserving (and incrementing) the use_count.. for an upcast, I can simply assign a shared_ptr<Child> to shared_ptr<Parent>. But for the downcast, I need to incorporate a dynamic_cast<childType> to get what I want.. With an older compiler that didn't like member templates, the boost conf would leave the internal pointer and use count as public, so I wrote my own casting function.. However, the newer compiler doesn't give this public access, so I may be stuck without modifying the header... any thoughts?

2 1

How to build the latest release?
by Sinan 08 Nov '01

08 Nov '01

No matter what I try, ( I set JAMBASE, specified boost-base.jam etc... I always get the following error kanita% jam -f./tools/build/allyourbase.jam -sTOOLS="suncc" ./tools/build/allyourbase.jam: line 1608: syntax error at keyword ( don't know how to make all ...found 1 target... ...can't find 1 target... kanita% Line 1608 is the one that says: rule remember-binding ( target : bound-path ) { gBINDING($(target)) = $(bound-path) ; } ... How do I make jam understand the extended syntax ? ( Using FTjam 2.3.5 ...) Sinan Karasu ---------- # (C) Copyright David Abrahams 2001. Permission to copy, use, # modify, sell and distribute this software is granted provided this # copyright notice appears in all copies. This software is provided # "as is" without express or implied warranty, and with no claim as # to its suitability for any purpose. # compute directories for invoking WS6U2 WS6U2_BIN_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)bin ; WS6U2_BIN_DIRECTORY ?= "" ; # Don't clobber tool names if WS6U2_ROOT_DIRECTORY not set WS6U2_INCLUDE_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)include ; WS6U2_STDLIB_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)lib ; flags cc LINKFLAGS <runtime-link>static : -Bstatic ; flags cc CFLAGS <debug-symbols>on : -g ; flags cc LINKFLAGS <debug-symbols>on : -g ; flags cc CFLAGS <optimization>off : -xO0 ; flags cc CFLAGS <optimization>speed : -xO4 ; # Other optimizations we might want for WS6U2 # # flags cc CFLAGS <optimization>space : -xO2 ; flags cc CFLAGS <inlining>off : -xinline=no%func ; flags cc CFLAGS <inlining>on : -xinline=%auto ; flags cc CFLAGS <inlining>full : -xinline=%auto ; flags cc CFLAGS <profiling>on : -xpg ; flags cc LINKFLAGS <profiling>on : -xpg ; flags cc DEFINES <define> ; flags cc UNDEFS <undef> ; flags cc HDRS <include> ; flags cc STDHDRS : $(WS6U2_INCLUDE_DIRECTORY) ; flags cc STDLIBPATH : $(WS6U2_STDLIB_DIRECTORY) ; flags cc CFLAGS <shared-linkable>true : -KPIC ; flags cc LINKFLAGS <shared-linkable>true : -KPIC ; flags cc LINKFLAGS <target-type>DLL : -G ; flags cc LIBPATH <library-path> ; flags cc NEEDLIBS <library-file> ; flags cc FINDLIBS <find-library> ; #### Link #### rule Link-action { # This will appear before the import library name when building a DLL, but # will be "multiplied away" otherwise. The --exclude-symbols directive # proved to be neccessary with some versions of Cygwin. ##sik IMPLIB_COMMAND on $(<) = "-Wl,--exclude-symbols,_bss_end__:_bss_start__:_data_end__:_data_start__ -Wl,--out-implib," ; # IMPLIB_COMMAND on $(<) = "-Wl,--out-implib," ; cc-Link-action $(<) : $(>) ; } # for cc, we repeat all libraries so that dependencies are always resolved actions cc-Link-action bind NEEDLIBS { $(WS6U2_BIN_DIRECTORY)CC $(IMPLIB_COMMAND)$(<[2]) $(LINKFLAGS) -o "$(<[1])" -L$(LIBPATH) -L$(STDLIBPATH) "$(>)" "$(NEEDLIBS)" "$(NEEDLIBS)" -l$(FINDLIBS) -znodefs } # older actions # $(WS6U2_BIN_DIRECTORY)dlltool -e $(<[1]:S=:D=:G=) -l "$(<[2])" "$(>)" # $(WS6U2_BIN_DIRECTORY)CC $(LINKFLAGS) -L$(STDLIBPATH) "$(>)" "$(NEEDLIBS)" "$(NEEDLIBS)" -o "$(<[1])" #### Cc ##### rule Cc-action { cc-Cc-action $(<) : $(>) ; } actions cc-Cc-action { $(WS6U2_BIN_DIRECTORY)cc -c -U$(UNDEFS) -D$(DEFINES) $(CFLAGS) -I$(BOOST_ROOT) -I"$(HDRS)" -I"$(STDHDRS)" -o "$(<)" "$(>)" } #### C++ #### rule C++-action { cc-C++-action $(<) : $(>) ; } actions cc-C++-action { $(WS6U2_BIN_DIRECTORY)CC -c -U$(UNDEFS) -D$(DEFINES) $(CFLAGS) $(C++FLAGS) -I$(BOOST_ROOT) -I"$(HDRS)" -I"$(STDHDRS)" -o "$(<)" "$(>)" } #### Archive #### rule Archive-action { cc-Archive-action $(<) : $(>) ; } actions updated together piecemeal cc-Archive-action { ar ru "$(<)" "$(>)" } [Non-text portions of this message have been removed]

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any question
by Thomas Matelich 08 Nov '01

08 Nov '01

In the docs, it uses a function called any_ptr, but I don't think it exists. Could someone please explain? -- Thomas O Matelich Senior Software Designer Zetec, Inc. matelich(a)home.com tmatelich(a)zetec.com

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Boost release 1.25.1 now available
by Beman Dawes 07 Nov '01

07 Nov '01

Boost release 1.25.1 is now available at www.boost.org: * Boost Build System: Continued improvements. * Config Library: Continued refinements. * Graph Library: Final cleanup for upcoming the Boost Graph Library book. * Thread Library: Minor fixes - tests now pass on most Win32 and POSIX systems including Linux and Solaris. Semaphore removed as too error prone. * Function Library: direct support for member function pointers and documentation updates. * Boost-Users mailing list has been created to address topics of interest to users of Boost libraries. * Boost Wiki web added. Provides a place for Boost users to openly discuss and document the use of Boost libraries. It is not officially maintained by Boost developers. This release uses a new ftp program for updating the web site; the program used in the past was prone to get confused about dates, and didn't recover gracefully from network or server errors. Please let me know if you spot any out-of-date web pages on the site. --Beman

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Boost-Users announcement in 1.25.1
by Douglas Gregor 02 Nov '01

02 Nov '01

Hello all, We should announce the existence of the Boost-Users group in the 1.25.1 release of Boost. I've added a bullet to the "Latest News" entry for the release (just check index.htm in the top level of CVS). My two questions are: - Is there a more precise goal statement that should be in the announcement? (i.e., more precise that "address topics of interest to users of Boost libraries", which is intentionally vague) - Should we mention the Wiki? (with the usual not-Boost-moderated disclaimer) Doug

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RE: [Boost-Users] array -v- array_traits
by Jim.Hyslop 25 Oct '01

25 Oct '01

Duane Murphy [SMTP:duanemurphy@mac.com] wrote: > I noticed that array.hpp uses > > #ifndef BOOST_ARRAY_HPP > #define BOOST_ARRAY_HPP > .. > #endif > > and array_traits.hpp uses: > > #if !defined(BOOST_ARRAY_HPP) > #define BOOST_ARRAY_HPP 1 > .. > #endif > > This means that you cant use them both at the same time? The first one wins? > > These are certainly similar classes but they dont seem to collide. > > Is this a subtle bug or intentional? Hi, Duane. I don't know the answer, but I've cc'd this to the Boost developer's list. Someone there should have an answer ;-) -- Jim Hyslop (moderator, Boost-Users group)

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array -v- array_traits
by Duane Murphy 25 Oct '01

25 Oct '01

I noticed that array.hpp uses #ifndef BOOST_ARRAY_HPP #define BOOST_ARRAY_HPP .. #endif and array_traits.hpp uses: #if !defined(BOOST_ARRAY_HPP) #define BOOST_ARRAY_HPP 1 .. #endif This means that you cant use them both at the same time? The first one wins? These are certainly similar classes but they dont seem to collide. Is this a subtle bug or intentional? ..Duane

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FW: [boost] any
by Jim.Hyslop 19 Oct '01

19 Oct '01

rajanikanth jammalamadaka [SMTP:rajanik3@rediffmail.com] wrote: > Hi! Jim, > Could you please tell me why this code is not working: > > #include <iostream> > #include <boost/any.hpp> > using namespace boost; > int main() > { > > any holdsanything ; > holdsanything = 9; > std::cout<<holdsanything<<endl; > holdsanything = std::string("hello"); > std::cout<<holdsanything<<endl; > return 0; > } Hi, Raj You didn't specify what problems you were having. Am I correct in assuming you get a compiler error on the std::cout lines? If so, then the problem is that class 'any' does not have an extraction operator defined. If you change the lines to: std::cout << any_cast<int>(holdsanything)<<std::endl; and std::cout << any_cast<const char *>(holdsanything) << std::endl; it should work properly. -- Jim

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compiling boost on Win2k
by Mike Owens 19 Oct '01

19 Oct '01

I got a this suggestion from Damien Mulligan which worked really well. Use subst to map a drive letter to the path for the MSVC directory then use that drive letter in the VISUALC environment variable. Works like a charm. I should of thought of that. Thanks Damien. Mike > Date: Thu, 18 Oct 2001 08:12:05 -0400 > From: Anthony Kolarik <a.kolarik(a)computer.org> >Subject: RE: Digest Number 11 > >I don't have an answer for your specific JAM/Boost problem but I've seen >similar build problems (using cons)on NT and ended up using temp files to >hold the command line for the linker, rather than try to figure out why the >command lines worked fine on some machines and were too much for others. >You could look into registry settings to extend the buffer size for the >command interpreter but unless you can do it programmatically the temp file >approach would probably be a better. > -- Tony K.

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RE: [Boost-Users] Digest Number 11
by Anthony Kolarik 18 Oct '01

18 Oct '01

I don't have an answer for your specific JAM/Boost problem but I've seen similar build problems (using cons)on NT and ended up using temp files to hold the command line for the linker, rather than try to figure out why the command lines worked fine on some machines and were too much for others. You could look into registry settings to extend the buffer size for the command interpreter but unless you can do it programmatically the temp file approach would probably be a better. -- Tony K. > Date: Wed, 17 Oct 2001 15:47:58 -0700 > From: Mike Owens <mikeo(a)medifor.com> > Subject: Build Problem > > I am trying to build boost on windows 2000 and I get "The > input line is too > long" errors. I have included some sample output from jam. > Please note I > switched to short file names to try and alleviate this > problem. Anyone have > any suggestions on overcoming this problem? > > "C:\Progra~1\micros~2\VC98"\bin\cl /Zm400 -nologo -GX -c > -DNDEBUG > -DBOOST_ > RE_NO_LIB=1 /O2 /GX /GR /MD -I"libs\regex\build" > -I"libs\regex\build\..\..\.. > " -I""C:\Progra~1\micros~2\VC98"\include" > -Fo"libs\regex\build\bin\libboost_re > gex.lib\msvc\release\runtime-link-dynamic\posix_api.obj" > -Tp"libs\regex\build\. > ./src\posix_api.cpp" > > ...failed msvc-C++-action > libs\regex\build\bin\libboost_regex.lib\msvc\release\r > untime-link-dynamic\posix_api.obj ... > msvc-C++-action > libs\regex\build\bin\libboost_regex.lib\msvc\release\runtime-lin > k-dynamic\regex.obj > The input line is too long. >

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Build Problem
by Mike Owens 17 Oct '01

17 Oct '01

I am trying to build boost on windows 2000 and I get "The input line is too long" errors. I have included some sample output from jam. Please note I switched to short file names to try and alleviate this problem. Anyone have any suggestions on overcoming this problem? "C:\Progra~1\micros~2\VC98"\bin\cl /Zm400 -nologo -GX -c -DNDEBUG -DBOOST_ RE_NO_LIB=1 /O2 /GX /GR /MD -I"libs\regex\build" -I"libs\regex\build\..\..\.. " -I""C:\Progra~1\micros~2\VC98"\include" -Fo"libs\regex\build\bin\libboost_re gex.lib\msvc\release\runtime-link-dynamic\posix_api.obj" -Tp"libs\regex\build\. ./src\posix_api.cpp" ...failed msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc\release\r untime-link-dynamic\posix_api.obj ... msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc\release\runtime-lin k-dynamic\regex.obj The input line is too long.

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