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std::vector< boost::shared_ptr<int> >::pop_back()
by bringiton bringiton 10 Jul '06

10 Jul '06

This question is based on curiosity. How does std::vector::pop_back() call the destructor of the item getting removed? i understood std::vector to be a contigious array of memory, therefore an item's memory does not go out of scope when being popped. ie the item goes out of scope when the entire array goes out of scope. example code: the reference count is decremented when the item is popped from the vector. boost::shared_ptr<int> item1(new int(1)); std::vector< boost::shared_ptr<int> > vect1; vect1.push_back(item1); std::cout << item1.use_count() << std::endl; vect1.pop_back(); std::cout << item1.use_count() << std::endl;

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vc-8_0-stlport target : Building Boost with VS2005 & STLPort 5 ?
by Sagnes, Frederic 10 Jul '06

10 Jul '06

Hello, Now that STLPort works for VS2005, I'd like to know if a BJam target for Visual Studio 2005 and STLPort 5.0.2 is available (as a patch for the 1.33 Boost distribution). Is STLPort 5.0 too young for inclusion, or is this target to be available only in the 1.34 version of the Boost libraries distribution? Regards _______________________________________________ Frédéric Sagnes, A&D AS RD DH K3 Siemens AG Karlsruhe

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[boost.python] use of multi_array in python
by Sebastien Fortier 10 Jul '06

10 Jul '06

I'm having some problems with the use of multi_array's with python. What I'm trying to do is to export some functions that create multi_array's and pass these multi_array's to other functions that will extract other array's from them and display them. Lets say I have this as an example. //ArrayRef2D.h typedef for a 2D multi_array of doubles #ifndef ARRAYREF2D_H_ #define ARRAYREF2D_H_ #include <boost/multi_array.hpp> typedef boost::const_multi_array_ref < double, 2 > const_array_type2D_ref_d_t; typedef boost::multi_array < double, 2 > array_type2D_d_t; #endif /*ARRAYREF2D_H_*/ //Fstd.h 2D multi_array generator #ifndef FSTD_H_ #define FSTD_H_ #include "ArrayRef2D.h" #include <string> using namespace std; class Fstd { public: Fstd(string filename) : filename_(filename){} array_type2D_d_t get2Dfield() { array_type2D_d_t matrix(boost::extents[2][2]); matrix[0][0] = 0; matrix[0][1] = -1; matrix[1][0] = 20; matrix[1][1] = -30; return matrix; } private: string filename_; }; #endif /*FSTD_H_*/ //MatrixAlgorithm2D.h provides methods for displaying and manipulating matrices #ifndef MATRIXALGORITHM2D_H_ #define MATRIXALGORITHM2D_H_ #include "ArrayRef2D.h" #include <cassert> #include <cmath> #include <iostream> using namespace std; class MatrixAlgorithm2D { public: static array_type2D_d_t windChill(const_array_type2D_ref_d_t TT, const_array_type2D_ref_d_t UV) { assert((TT.shape()[0] == UV.shape()[0]) && (TT.shape()[1] == UV.shape()[1])); array_type2D_d_t RE(boost::extents[TT.shape()[0]][TT.shape()[1]]); for (unsigned int x = 0; x < TT.shape()[0]; x++) { for (unsigned int y = 0; y < TT.shape()[1]; y++) { if ((TT[x][y] <= 0.0) && (UV[x][y] >= 5.0)) { RE[x][y] = ( 13.1200 + 0.6215 * (TT[x][y]) + (0.3965 * (TT[x][y]) - 11.3700) * (pow((UV[x][y]),0.16))); } else { RE[x][y] = (TT[x][y]); } } } return RE; } static void display_d(const_array_type2D_ref_d_t a) { for (unsigned int x = 0; x < a.shape()[0]; x++) { for (unsigned int y = 0; y < a.shape()[1]; y++) { cout << a[x][y]; if(y < a.shape()[1] - 1) { cout << ", "; } } cout<<endl; } } }; #endif /*MATRIXALGORITHM2D_H_*/ //matrix.cpp boost.python interface file generated with pyste // Boost Includes ============================================================== #include "boost/python.hpp" #include "boost/cstdint.hpp" // Includes ==================================================================== #include "Fstd.h" #include "MatrixAlgorithm2D.h" // Using ======================================================================= using namespace boost::python; // Module ====================================================================== BOOST_PYTHON_MODULE(matrix) { class_< Fstd >("Fstd", init< const Fstd& >()) .def(init< std::string >()) .def("get2Dfield", &Fstd::get2Dfield) ; class_< MatrixAlgorithm2D >("MatrixAlgorithm2D", init< >()) .def(init< const MatrixAlgorithm2D& >()) .def("windChill", &MatrixAlgorithm2D::windChill) .def("display_d", &MatrixAlgorithm2D::display_d) .staticmethod("windChill") .staticmethod("display_d") ; } I generated my so file with bjam and then Python 2.3.5 (#2, Sep 4 2005, 22:01:42) [GCC 3.3.5 (Debian 1:3.3.5-13)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import matrix >>> dir(matrix) ['Fstd', 'MatrixAlgorithm2D', '__doc__', '__file__', '__name__'] >>> m = matrix.Fstd("HELLO") >>> l = m.get2Dfield() Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: No to_python (by-value) converter found for C++ type: boost::multi_array<double, 2, std::allocator<double> > So you see I can't use my code, what am I doing wrong? I would have liked to declare 2 arrays with get2Dfield() and pass these array to my windChill function to get another 2d matrix which I could then display with my display_d function. -- Sébastien Fortier

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[shmem] Bug I can't workaround
by Berenguer Blasi 10 Jul '06

10 Jul '06

Hi, first of all congratulations to Ion for this great library. I am trying to use shmem for a very large project and I have stumbled several bugs (you can read about them at the sourceforge bugtracker) I have workarounded so far, but there's one I can't workaround. Maybe somebody has found a solution? How to reproduce: 1- Any sample code will do (you can use the sample source at 'Quick Guide for the Impatient' -> 'Using STL containers and mapping the memory at a fixed address') 2- Change to a fixed_named segment, if it isn´t so already in your sample, and increase the segment size to 104857600. I guess it's not a matter of this specific size but something that happens for large segments. 3- Leave process A running in the background, run process B and you get a segmentation fault... 4- You won't have the problem for sizes: 1048576 or 10485760. Has anybody experienced something similar? Thanks in advance. It's driving me crazy! and I am so close to finishing my code. Only this bug pending! Environment: FC 5, gcc4.1.1-1

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[variant].[apply_visitor] Binary visitation: Build related problem.
by Prashant Thakre 10 Jul '06

10 Jul '06

Hi, Compiler instantiates the second Binary visitor instead of the first one even though the template parameters are same. regards, Prashant --------------------------------------------------------------------------- struct add_tuple_visitor: public boost::static_visitor<bool> { // Expected this to be instantiated by the compiler. // 1. template <typename T> bool operator()( T & lhs, const T & rhs) const { lhs += rhs ; return true; } // Compiler considers this as an appropriate fit .. // 2. template <typename T, typename U> bool operator()( T & lhs, const U & rhs) const { lhs += rhs ; return true; } }; struct agg_calc { public: template <typename T> bool operator () ( T & lhs, const T & rhs ) const { for( std::size_t curr_oper = 0; curr_oper < num_operations; ++v ) { switch( agg_operators.at(curr_oper) ) { case '+' : boost::apply_visitor( agg_visitor, lhs.at(curr_oper), //vector of variants rhs.at(curr_oper) //vector of variants ); break; default: break; }; } // for loop return true; } //Store the aggregation operators agg_types agg_operators; std::size_t num_operations; // Create visitor objects for delayed form of apply_visitor add_tuple_visitor agg_visitor; }; ---------------------------------------------------------------------------

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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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