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[variant] apply_visitor to rvalue variant
by Marc Mutz 10 Jul '06

10 Jul '06

Hi, My gcc 4.0 doesn't let me call apply_visitor on an rvalue variant. This is due to the Variant argument being a non-const reference, I guess. Is this a deliberate design decision (if so, the rationale should be documented), an oversight (in that case, it should be fixed), or a compiler bug (highly unlikely, since all of gcc 3.2 through 4.1 would then have it). Testcase (== usecase) attached. Thanks, Marc -- Marc Mutz -- marc(a)klaralvdalens-datakonsult.se, mutz(a)kde.org Klarälvdalens Datakonsult AB, Platform-independent software solutions

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Problems trying to use boost book
by Robert Ramey 10 Jul '06

10 Jul '06

I'm interested in setting up quickbook/boostbook/docbook for my windows NT machine. To that end I've religously followed the instructions in http://www.boost.org/regression-logs/cs-win32_metacomm/doc/html/boostbook/g… (Not including installing Java) I get to "Running Boost Book". Following the instructions there I invoke bjam --v2 and get: the following response $ bjam --v2 warning: Python location is not configured warning: the Boost.Python library won't be built Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). warning: no toolsets are configured. warning: you won't be able to build C++ programs. warning: please consult the documentation at warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html I've verified the current directory $ pwd C:/BoostHead/doc and that xsltproc is in my path $ xsltproc Usage: xsltproc [options] stylesheet file [file ...] Options: --version or -V: show the version of libxml and libxslt used --verbose or -v: show logs of what's happening --output file or -o file: save to a given file --timing: display the time used --repeat: run the transformation 20 times --debug: dump the tree of the result instead --dumpextensions: dump the registered extension elements and functions t o stdout --novalid skip the Dtd loading phase --nodtdattr do not default attributes from the DTD --noout: do not dump the result --maxdepth val : increase the maximum depth --maxparserdepth val : increase the maximum parser depth --html: the input document is(are) an HTML file(s) --param name value : pass a (parameter,value) pair value is an UTF8 XPath expression. string values must be quoted like "'string'" or use stringparam to avoid it --stringparam name value : pass a (parameter, UTF8 string value) pair --path 'paths': provide a set of paths for resources --nonet : refuse to fetch DTDs or entities over network --nowrite : refuse to write to any file or resource --nomkdir : refuse to create directories --writesubtree path : allow file write only with the path subtree --catalogs : use SGML catalogs from $SGML_CATALOG_FILES otherwise XML Catalogs starting from file:///etc/xml/catalog are activated by default --xinclude : do XInclude processing on document intput --load-trace : print trace of all external entites loaded --profile or --norman : dump profiling informations Project libxslt home page: http://xmlsoft.org/XSLT/ To report bugs and get help: http://xmlsoft.org/XSLT/bugs.html Same goes for doxygen $ doxygen Doxyfile not found and no input file specified! Doxygen version 1.4.7 Copyright Dimitri van Heesch 1997-2006 You can use doxygen in a number of ways: 1) Use doxygen to generate a template configuration file: doxygen [-s] -g [configName] If - is used for configName doxygen will write to standard output. 2) Use doxygen to update an old configuration file: doxygen [-s] -u [configName] 3) Use doxygen to generate documentation using an existing configuration file: doxygen [configName] If - is used for configName doxygen will read from standard input. 4) Use doxygen to generate a template style sheet file for RTF, HTML or Latex. RTF: doxygen -w rtf styleSheetFile HTML: doxygen -w html headerFile footerFile styleSheetFile [configFile] LaTeX: doxygen -w latex headerFile styleSheetFile [configFile] 5) Use doxygen to generate an rtf extensions file RTF: doxygen -e rtf extensionsFile If -s is specified the comments in the config file will be omitted. If configName is omitted `Doxyfile' will be used as a default. ************ I don't get any .html files created in the html directory. So now I'm stuck. Please help. FYI - a couple of comments on getting/started.html (very strange name!) Its not altogether clear from reading the documentation whether things like DOCBOOK_XSL_DIR should be an exported environmental variable with the value set to the appropriate directory or if the actual directory name should be substitued where DOCBOOK_XSL_DIR appears in the example. I presumed the former. I've double checked this like so: $ ls "$DOCBOOK_XSL_DIR" AUTHORS RELEASE-NOTES.txt javahelp BUGS RELEASE-NOTES.xml lib COPYING TODO manpages ChangeHistory.xml.zip VERSION params ChangeLog.xml catalog.xml profiling INSTALL common slides LOG eclipse template NEWS extensions test.sh NEWS.html fo tools NEWS.xml html uninstall.sh README htmlhelp website RELEASE-NOTES.html images wordml RELEASE-NOTES.pdf install.sh xhtml $ ls "$DOCBOOK_DTD_DIR" ChangeLog catalog.xml dbhierx.mod docbook.cat soextblx.dtd README dbcentx.mod dbnotnx.mod docbookx.dtd calstblx.dtd dbgenent.mod dbpoolx.mod ent $ So what am I missing? Robert Ramey

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trouble with bind+signals
by Brendan Miller 10 Jul '06

10 Jul '06

I'm relatively new to the boost library and I'm having a problem with boost::signals and bind. I've reproduced the problem I'm hitting here. c++: typedef boost::signal <LRESULT (ISigSource &, LPCREATESTRUCT)> SigWMCreate; SigWMCreate sig; LPARAM x; boost::bind(boost::ref(sig), boost::ref(*this), _1)((LPCREATESTRUCT)(x)); The above function application generates the following warning on msvc 8/vs2005: Error 1 error C2664: '__w64 long boost::_bi::bind_t<R,F,L>::operator ()<LPCREATESTRUCT>(A1 &) const' : cannot convert parameter 1 from 'LPCREATESTRUCT' to 'LPCREATESTRUCT &' c:\documents and settings\catphive\my documents\visual studio 2005\projects\game\game\mainfrm.cpp 20 Now, this problem goes away if x is of type LPCREATESTRUCT to start with instead of another type converted to LPCREATESTRUCT within the parentheses of the function application. This seems a bit odd to me. Also, I'd like to avoid changing how the function application is performed and get to the root of the problem since in my *actual* code, the application is performed in a system macro, and I'd like to avoid changing external headers (and having to remember what I changed in case of an update to the headers) if possible. My guess is that performing the cast creates an intermediary result that I'm not allowed to take a reference of. Is this the case? Does this happen on other compilers with analogous types? Is there a way to work around this? Thanks

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[parameter] Interface questions
by Cromwell Enage 09 Jul '06

09 Jul '06

1. Will BOOST_PARAMETER_IMPL(name) expand to the name of the function that actually "owns" the main body of code? 2. Will there be a way to define a Boost.Parameterized member function outside the class definition? Or should we let the compiler decide whether or not to inline such a function? Cromwell D. Enage __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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uint_t<bits>::value where bits is a template parameter fails to compile
by Phil Endecott 07 Jul '06

07 Jul '06

Dear All, I am having trouble using the integer library. The following fails to compile: #include <boost/integer.hpp> template <int bits> void fn(void) { //typedef boost::uint_t<8>::least t; typedef boost::uint_t<bits>::least t; t var; } int main(int argc, char* argv) { fn<8>(); } With g++ 4.0.0 on Linux and Boost 1.32, I get: boost_int_test.cc: In function â€˜void fn()â€™: boost_int_test.cc:7: error: expected initializer before â€˜tâ€™ boost_int_test.cc:8: error: â€˜tâ€™ was not declared in this scope boost_int_test.cc:8: error: expected `;' before â€˜varâ€™ The problem seems to occur when I use a template parameter - "bits" in this case - as the template parameter to uint_t. If I use a constant (as in the commented-out line) it works. Is this a C++ feature, or a bug somewhere? Can anyone suggest a workaround? Thanks, Phil.

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[spirit] working with end_p
by james.jones＠firstinvestors.com 07 Jul '06

07 Jul '06

From: Neil Hunt <boost(a)thehunts.id.au> > Hello all, > > Given a simple spirit grammar (simplified from my real grammer and > untested) such as: > > file = *line; > line = sensible_line >> ending >> *comment; > sensible_line = confix_p( '\"', *c_escape_ch_p, '\"' ); > comment = !( ch_p(';') >> ( anychar_p - eol_p ) ) >> ending; > ending = *blank_p >> ( eol_p | end_p ); > > > Note: any given line can be legitimately terminated by the end of the > file or end of line > > And there can be arbitrary numbers of comment lines between sensible lines. > > However since 'comment' is terminated with 'ending', the parser ends up > in an infinite loop matching the kleene star on end_p because it returns > zero length (doesn't advance the scanner). At least I think this is the > problem. Indeed. You can fix it by adjusting your grammar thus: line = sensible_line >> (ending >> comment)* >> ending; sensible_line ... as before comment = !( ch_p(';') >> ( anychar_p - eol_p ) ); ending ... as before - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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[serialization] Facets for writing and reading infinity and nan to text streams
by Johan Råde 07 Jul '06

07 Jul '06

Following a suggestion of Robert Ramey's, I have put together facets for writing and reading non-finite floating point numbers, such as infinity and nan, to text streams, in a consistent and portable way. This is useful when serializing to text archives, but should have other applications as well. I have attached a zip file. It contains three files: 1. the actual code: non_finite_num_facets.hpp 2. documentation: non_finite_num_facets_doc.txt 3. tests: non_finite_num_facets_test.cpp The code handles char and wchar_t. It handles float, double and long double. The code has been tested with VC++ 7.1 but should work with other compilers as well. Any feedback is wellcome. --Johan Råde (rade(a)maths.lth.se)

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std::find_if, boost::mem_fn and boost::not1
by Pete Hodgson 06 Jul '06

06 Jul '06

Hi All, I'm just getting into using boost and stl algorithms, and I'm getting some indecipherable compiler errors that I'd like some help understanding. Here's some sample code: <------------------------SNIP------------------------> #include <boost/shared_ptr.hpp> #include <boost/functional.hpp> #include <boost/bind.hpp> class CEgg { public: bool IsHatched() const; }; typedef std::vector< boost::shared_ptr<CEgg> > tEggsVector; //this function compiles with no problems bool SomeEggsHaveHatched() { tEggsVector basketOfEggs; tEggsVector::const_iterator it = std::find_if( basketOfEggs.begin(), basketOfEggs.end(), boost::mem_fn( &CEgg::IsHatched ) ); bool bSomeEggsHaveHatched = ( it != basketOfEggs.end() ); return bSomeEggsHaveHatched; } //this function doesn't compile, //presumably because of the boost::not1 usage bool AllEggsHaveHatched() { tEggsVector basketOfEggs; tEggsVector::iterator it = std::find_if( basketOfEggs.begin(), basketOfEggs.end(), boost::not1( boost::mem_fn( &CEgg::IsHatched ) ) ); bool bSomeEggsHaventHatched = ( it != basketOfEggs.end() ); return !bSomeEggsHaventHatched; } <------------------------SNIP------------------------> When I try and compile this in Visual C++ 2003 I get the following compile errors for AllEggsHaveHatched(): c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\algorithm(64) : error C2664: 'bool boost::unary_negate<Predicate>::operator ()(const boost::call_traits<T>::param_type) const' : cannot convert parameter 1 from 'std::allocator<_Ty>::value_type' to 'const boost::call_traits<T>::param_type' with [ Predicate=boost::_mfi::cmf0<bool,CEgg>, T=boost::unary_traits<boost::_mfi::cmf0<bool,CEgg>>::argument_type ] and [ _Ty=boost::shared_ptr<CEgg> ] and [ T=boost::unary_traits<boost::_mfi::cmf0<bool,CEgg>>::argument_type ] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called c:\WORK\4DCapture_Soln\VideoCapture\PixelinkCaptureFacade.h(46) : see reference to function template instantiation '_InIt std::find_if<std::vector<_Ty>::iterator,boost::unary_negate<Predicate>>(_InIt,_InIt,_Pr)' being compiled with [ _InIt=std::vector<boost::shared_ptr<CEgg>>::iterator, _Ty=boost::shared_ptr<CEgg>, Predicate=boost::_mfi::cmf0<bool,CEgg>, _Pr=boost::unary_negate<boost::_mfi::cmf0<bool,CEgg>> ] Any idea why boost::not1 seems to be causing problems? Should I be using std::not1? or boost::mem_fun instead of boost:mem_fn? Cheers and TIA, Pete

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Boost compile fails on Visual C++ 6, warnings on VS8
by Sagnes, Frederic 06 Jul '06

06 Jul '06

Hello, I'm using the Boost libraries for my project (archive, threads, program_options, date_time) and these are really helpful, saved me a lot of time and the great designs make them easy to use. I'm compiling my project with Visual Studio 2005 (8.0) and gcc 4.0.1. Both work quite well, I only have warnings on VS8 because it seems to render integer operation in 64 bit and no cast is being done (a static cast would fix this), some deprecation warning which are normal, and the GCC build works well. But the VC++ 6 compilation is a real pain, here is the command line for BJam: bjam "-sTOOLS=msvc" "-sMSVC_ROOT=C:\Programme\Microsoft Visual Studio\VC98" "-sVISUALC=C:\Programme\Microsoft Visual Studio\VC98" --prefix=D:\ALM\Boost\msvc install I get a lot of compilation errors, including internal compiler errors which are quite alarming. I thought Boost libraries were meant to be portable and compile on VS6. The archive library for instance fails to build. Is there a workaround to build Boost libraries on VS6? Did I miss a switch or setting? Is VS6 that bad that it can't render complex but standard C++ code? Where can I check with which compiler Boost libraries are compatible? Best regards _______________________________________________ Frédéric Sagnes, A&D AS RD DH K3 Siemens AG Karlsruhe

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boost::bind question
by Surya Kiran Gullapalli 06 Jul '06

06 Jul '06

Hi, I've a std::map with the following structure. std::map < int, tuple<std::string, std::string> > mapTuple ; typedef map < int, tuple<string, string> > mapTuple ; Now i've say 10 elements in this container. Now i'd like to iterate thru this container and find a specific element which matches a certain criteria. Right now I'm doing this. MapIntTuple::iterator iter ; for (iter = mymap.begin(); iter != mymap.end(); ++iter) { if (iter->second.get<0>() == current_field) break ; } I'd like to iterate thru the container and find the element whose first string in the tuple matches with my search string. How can i do this using boost::lamdba::bind and std::find_if. May be that will help me in understanding boost::bind better. iter = find_if (mymap.begin(), mymap.end(), ???) ; Thanks in advance, Surya

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