December 2009 - Boost-users - lists.preview.boost.org

Problem building boost on Windows
by Nathan Ridge 09 Dec '09

09 Dec '09

Hello, I'm having some trouble building the Boost libraries on Windows. - My OS is Windows Vista SP2 - My compiler in MinGW g++ 4.4. The folder containing the g++ executable is in my PATH environment variable. This is what I've done: - Downloaded the latest version (1.41) of the Boost libraries from www.boost.org and extracted it to C:\Dev\Libraries\boost (so e.g. C:\Dev\Libraries\boost\libs is a subfolder) - Downloaded the latest version (3.1.17) of Boost Jam from http://sourceforge.net/projects/boost/files/boost-jam and extracted bjam.exe into C:\Dev\Libraries\boost - Opened up a command prompt, cd'd into C:\Dev\Libraries\boost - Ran the command "bjam --with-filesystem variant=release link=static threading=single toolset=gcc" The output, up to the first error, is the following: == START BJAM OUTPUT == WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets Building the Boost C++ Libraries. After the build, the headers will be located at C:\Dev\Libraries\boost The libraries will be located at C:\Dev\Libraries\boost\stage\lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree. ...patience... ...found 441 targets... ...updating 27 targets... common.mkdir stage common.mkdir stage\lib common.mkdir bin.v2 common.mkdir bin.v2\libs common.mkdir bin.v2\libs\system common.mkdir bin.v2\libs\system\build common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0 common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o g++: libs\system\src\error_code.cpp: No such file or directory g++: no input files "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DBOO ST_SYSTEM_STATIC_LINK=1 -DNDEBUG -I"." -c -o "bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link -static\error_code.o" "libs\system\src\error_code.cpp" ...failed gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib(clean) for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o... ...skipped <pstage\lib>libboost_system-mgw44-1_41.lib for lack of <pbin.v2\libs\system\build\gcc-min gw-4.4.0\release\link-static>libboost_system-mgw44-1_41.lib... [more similar errors] == END BJAM OUTPUT == So for some reason, it cannot find libs\system\src\error_code.cpp, which is actually located at C:\Dev\Libraries\boost\libs\system\src\error_code.cpp. Am I supposed to somehow specify the exact path where it should be looking? I tried adding the option --build-dir=C:\Dev\Libraries\boost, but I still get the same error. One suspicious thing that I noticed is that without the --build-dir option, the bin.v2 folder that is created is C:\Dev\bin.v2, as opposed to C:\Dev\Libraries\boost\bin.v2 or something like that. Not sure if this is related to my problem or not. What am I doing wrong? Thanks, Nate. _________________________________________________________________ Windows Live: Keep your friends up to date with what you do online. http://go.microsoft.com/?linkid=9691815

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how to delete references to objects from a container...
by rv_nath 09 Dec '09

09 Dec '09

Hi forum members, I want to use boost's shared_ptr class for the connection pool class that i am writing. However, i have a requirement to delete the connection object (which is going to be the shared-ptr) explicitly based on certain checks like validity and expiry etc. If I store the shared_ptr, I want to know how to delete this explicitly from the stl container. According to my understanding shared_ptrs cannot be 'delete'd. So, how to achieve this...? Thanx in advance and regards, RV -- View this message in context: http://old.nabble.com/how-to-delete-references-to-objects-from-a-container.… Sent from the Boost - Users mailing list archive at Nabble.com.

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How do I copy files and folders using boost and Visual Studio 2005?
by leeand00 09 Dec '09

09 Dec '09

I'm trying to use boost::filesystem to copy files and folders (just like a standard copy a folder and paste it in windows explorer). Although I've been to the boost::filesystem documentation, I still don't really know how to go about doing this. Do you have to recursively go though each directory (creating it) and find each file copying it? Additionally, how do you copy the file in C++/Boost? P.S. I'm using Boost 1.40.0 Update I think I may have ended up creating an answer to this one, only concern being that I don't do any try-catch errors to check for locked files and folders. The following code makes a copy of a directory in the relative path "../example/ecomm" and duplicates it to a non-existing path "../example/dup_ecomm": #include <boost/test/unit_test.hpp> #include <boost/algorithm/string.hpp> #include <boost/filesystem/operations.hpp> #include <boost/regex.hpp> #include <iostream> #include <fstream> #include<string> bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path // the duplicate directory ) { std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; // 1. Ensure that the directory we are trying to copy exists. if (!boost::filesystem::exists( ext_dir_path ) ) return false; bool createdDir = boost::filesystem::create_directory( duplicate_dir_path ); // cout << "createdDir: " << createdDir << endl; copy_dir(ext_dir_path, // the existing directory duplicate_dir_path, // the duplicate directory, ext_dir_path, // the base path for the existing directory duplicate_dir_path, true); std::cout << "END: copy_dir " << endl; } bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path, // the duplicate directory, const boost::filesystem::path & base_ext_dir_path, // the base path for the existing directory const boost::filesystem::path & base_duplicate_dir_path, // the base path for the duplicate of the exisiting directory bool isRootPath) { // Debug input arguments std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; std::cout << "- base_ext_dir_path: " << base_ext_dir_path << endl; std::cout << "- base_duplicate_dir_path: " << base_duplicate_dir_path << endl; std::cout << "- isRootPath: " << isRootPath << endl; boost::filesystem::directory_iterator end_itr; // default construction yields past-the-end cout << "--Beginning itr loop" << endl; for ( boost::filesystem::directory_iterator itr( ext_dir_path ); itr != end_itr; ++itr ) { if ( boost::filesystem::is_directory(itr->status()) ) { cout << "---itr->path(): " << itr->path() << endl; boost::filesystem::path newExtDir(itr->path()); string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); cout << "dup_path: " << dup_path << endl; boost::filesystem::path new_dup_dir(dup_path); bool createdDir = boost::filesystem::create_directory( new_dup_dir ); cout << "creating directory " << dup_path << " created: " << createdDir << endl; boost::filesystem::path newDuplicateDir(duplicate_dir_path); copy_dir(newExtDir, // the existing directory newDuplicateDir, // the duplicate directory, base_ext_dir_path, base_duplicate_dir_path, false); } else { cout << "---isLeaf: " << itr->path() << endl; string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); string src_path = itr->path().string(); cout << "src_path: " << src_path << endl; cout << "dup_path: " << dup_path << endl; boost::filesystem::path s_path(src_path); boost::filesystem::path d_path(dup_path); boost::filesystem::copy_file(s_path, d_path); } } std::cout << "--Ending itr loop" << endl; std::cout << "END: copy_dir " << endl; return false; } test_suite* init_unit_test_suite( int, char* [] ) { boost::filesystem::path ext_dir("..\\example\\ecomm"); boost::filesystem::path dir_dup("..\\example\\dup_ecomm"); copy_dir(ext_dir, dir_dup); // the duplicate directory, // ... unit tests...etc... } My question now is what I'm I forgetting to do in regards to locked files and directories? Additionally this same question has been posted over at http://stackoverflow.com/questions/1853812/how-do-i-copy-files-and-folders-… so that the rest of the programmer community may learn about boost. (You're welcome to answer there if you like). Thank you, Andrew J. Leer ----- Thank you,    Andrew J. Leer - http://leeand00.tiddlyspot.com/ My Blog -- View this message in context: http://old.nabble.com/How-do-I-copy-files-and-folders-using-boost-and-Visua… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Bind] How to create a functor which returns one of its arguments?
by Vadim Guchenko 09 Dec '09

09 Dec '09

Hello, All! Is there a simple way to create a functor that returns one of its arguments _1, _2, ...? Does standard unary functor exist, which simply returns its argument unchanged? I.e.: template<typename T> struct arg: public std::unary_function<T, T> { T operator()(const T &x) const { return x; } }; Then I could write: boost::bind(arg<int>(), _2) to create a functor which returns the value of its second argument, or boost::bind(arg<bool>(), true) to create a functor which always returns true. -- Best regards, Vadim Guchenko [yhw at relost dot net].

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[Regex] Compile error in char_regex_traits.hpp with gcc 3.3.1
by Olexandr Marchenko 09 Dec '09

09 Dec '09

Hi, All I've got a compile error(please see below) while trying to compile my simple program with gcc 3.3.1 and boost 1.41.0. The strange thing is that I was able to compile the program before, but got the error after I had moved the line "include <boost/regex.hpp>" from .cpp file to .h file. At least that's what I think, maybe I've changed something I don't remember about. Anyway, it looks like I have the error even before my code starts compiling. I don't understand the error message at all. Where is this "__attribute__"? I tried to google it but found nothing. I would appreciate any help The error: In file included from d:/pnw/06072009/build/incsys/boost/regex/v4/regex.hpp:55, from d:/pnw/06072009/build/incsys/boost/regex.hpp:31, from d:/pnw/06072009/be/csvrdeng/csvcursor.h:1, from csvcursor.cpp:2: d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:36: error: syntax error before `__attribute__' d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:44: error: `char_regex_traits_i' is not a template d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:47: confused by earlier errors, bailing out char_regex_traits.hpp(with unnecessary defines and comments omitted): namespace boost{ namespace deprecated{ //line 36 template <class charT> class char_regex_traits_i : public regex_traits<charT> {}; template<> class char_regex_traits_i<char> : public regex_traits<char> // line 44 { public: typedef char char_type; //line 47 typedef unsigned char uchar_type; typedef unsigned int size_type; typedef regex_traits<char> base_type; }; } // namespace deprecated } // namespace boost -- Regards, Alexandr

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[Serialization] How to serialize third party library function
by elizabeta petreska 09 Dec '09

09 Dec '09

Hello First all, sorry for my long post, and I hope I will be clear with the question. In my project I have a lot of classes, which I plan to serialize with boost serialization library. Most of my classes have as members third party library classes. The thing is that the third party library classes are very complex and I can't serialize them directly in the standard way i.e I can't say this : template<class Arhive,class MyThirdPartyClass> void serialize(Archive& ar, MyThirdPartyClass& t, const unsigned int version) { ar & t.meber1; ar & t.member2; .... } MyThirdparty library classes all provide their own method for serialization ( storing in custom archive and reading from the archive), so I was thinking to do this : namespace boost { namespace serialization { template<class Archive> inline void save(Archive & ar, const CustomClass& t, const unsigned int version) { /// save t to the custom archive here . } template<class Archive> inline void load(Archive & ar, CustomClass& t, const unsigned int version) { ////// read data from archive and assign to t } } } Now when I do the following : // save data CustomClass* cc=new CustomClass(.....); outarchive & cc; /// later on read CustomClass * rcc=0; inarchive & rcc; delete rcc; /// (*) crash here. delete is operator implemented in my CustomClass I notice that the crash maybe has to do something with that, that my CustomClass implements its own new and delete operators. I know that the default implementation of load_construct data uses operator placement ::new ( global new operator ) to allocate object when loading through pointer, and I am deleting the object above ( * ) with its specific class delete operator. To avoid the mismatch I did this : template<class Archive> inline void load_construct_data(Archive & ar, CustomClass * t, const unsigned int file_version) { new (t) CustomClass; // notice that this is the custom class operator , not :: new } In my suprise (*) is still crashing. Why ? Also I notice that if in load_construct data I am using the global new operator, and when deleting the global ::delete ( i.e :: delete rcc) operator there is no problem at all. But this is not solution, cause I want my CustomClass to use their own specific operators new and delete.

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[multi_index and flyweight]
by Samuel Charron 09 Dec '09

09 Dec '09

Hi, I'm currently facing some limitations from flyweight and multi_index. Let's begin with multi_index: I'd want to have a multi_index storing containers, and have one index based on all the contained elements. For example: two vectors [1 2 3] and [3 4] would be indexed as 1 -> [1 2 3] 2 -> [1 2 3] 3 -> [1 2 3] [3 4] 4 -> [3 4] How would you do that ? Flyweight: I'd like to have a scoped flyweight, without tracking, i.e.: { ... // create some elements } // All elements are deleted when leaving the scope. However, currently I didn't see a method to clear the internal container. One way I could do that would be copying - pasting the hashed_factory and adding a clear method. It would be easier to extend the class, just having the private container be protected. Would that be possible to do one a future release ? Or is there another easy way to do so ? Regards, Samuel

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Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

I have some more results regarding Windows platform to report. I tried with GCC-4.4.0 that's shipped with QT4.6 SDK on the same Win XP sp3 and received some different errors/warnings as pasted below: gcc.compile.c++ bin.v2\libs\chrono\build\gcc-mingw-4.4.0\debug\link-static\runtime-link- static\threading-multi\chrono.o In file included from ./boost/chrono/chrono.hpp:73, from libs\chrono\src\chrono.cpp:13: ./boost/ratio.hpp:66: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:67: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:68: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:79: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:80: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:81: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: template argument 1 is invalid ./boost/ratio.hpp:66: error: template argument 2 is invalid ./boost/ratio.hpp:66: error: invalid type in declaration before ';' token ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: template argument 1 is invalid ./boost/ratio.hpp:67: error: template argument 2 is invalid ./boost/ratio.hpp:67: error: invalid type in declaration before ';' token ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: template argument 1 is invalid ./boost/ratio.hpp:68: error: template argument 2 is invalid ./boost/ratio.hpp:68: error: invalid type in declaration before ';' token ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: template argument 1 is invalid ./boost/ratio.hpp:69: error: template argument 2 is invalid ./boost/ratio.hpp:69: error: invalid type in declaration before ';' token ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: template argument 1 is invalid ./boost/ratio.hpp:70: error: template argument 2 is invalid ./boost/ratio.hpp:70: error: invalid type in declaration before ';' token ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: template argument 1 is invalid ./boost/ratio.hpp:71: error: template argument 2 is invalid ./boost/ratio.hpp:71: error: invalid type in declaration before ';' token ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: template argument 1 is invalid ./boost/ratio.hpp:72: error: template argument 2 is invalid ./boost/ratio.hpp:72: error: invalid type in declaration before ';' token ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: template argument 1 is invalid ./boost/ratio.hpp:73: error: template argument 2 is invalid ./boost/ratio.hpp:73: error: invalid type in declaration before ';' token ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: template argument 1 is invalid ./boost/ratio.hpp:74: error: template argument 2 is invalid ./boost/ratio.hpp:74: error: invalid type in declaration before ';' token ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: template argument 1 is invalid ./boost/ratio.hpp:75: error: template argument 2 is invalid ./boost/ratio.hpp:75: error: invalid type in declaration before ';' token ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: template argument 1 is invalid ./boost/ratio.hpp:76: error: template argument 2 is invalid ./boost/ratio.hpp:76: error: invalid type in declaration before ';' token ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: template argument 1 is invalid ./boost/ratio.hpp:77: error: template argument 2 is invalid ./boost/ratio.hpp:77: error: invalid type in declaration before ';' token ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: template argument 1 is invalid ./boost/ratio.hpp:78: error: template argument 2 is invalid ./boost/ratio.hpp:78: error: invalid type in declaration before ';' token ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: template argument 1 is invalid ./boost/ratio.hpp:79: error: template argument 2 is invalid ./boost/ratio.hpp:79: error: invalid type in declaration before ';' token ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: template argument 1 is invalid ./boost/ratio.hpp:80: error: template argument 2 is invalid ./boost/ratio.hpp:80: error: invalid type in declaration before ';' token ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: template argument 1 is invalid ./boost/ratio.hpp:81: error: template argument 2 is invalid ./boost/ratio.hpp:81: error: invalid type in declaration before ';' token ./boost/ratio.hpp:131: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:132: error: 'boost::detail::ll_add<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:151: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:152: error: 'boost::detail::ll_add<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:167: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:168: error: 'boost::detail::ll_sub<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:187: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:188: error: 'boost::detail::ll_sub<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:200: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:201: error: 'boost::detail::ll_mul<X, Y>::min' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:202: error: 'boost::detail::ll_mul<X, Y>::max' cannot be initialized by a non-constant expression when being declared In file included from libs\chrono\src\chrono.cpp:13: ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: template argument 1 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:946: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:946: error: expected ';' before 'rep' ./boost/chrono/chrono.hpp:947: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:947: error: expected ';' before 'period' In file included from libs\chrono\src\chrono.cpp:27: libs\chrono\src\/win/chrono.cpp:34: error: 'monotonic_clock' has not been declared libs\chrono\src\/win/chrono.cpp:34: error: expected constructor, destructor, or type conversion before 'monotonic_clock' libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:26: warning: '<unnamed>::nanosecs_per_tic' defined but not used ./boost/system/error_code.hpp:208: warning: 'boost::system::system_category' defined but not used ./boost/system/error_code.hpp:209: warning: 'boost::system::generic_category' defined but not used ./boost/system/error_code.hpp:214: warning: 'boost::system::posix_category' defined but not used ./boost/system/error_code.hpp:215: warning: 'boost::system::errno_ecat' defined but not used ./boost/system/error_code.hpp:216: warning: 'boost::system::native_ecat' defined but not used -----Original Message----- From: Tan, Tom (Shanghai) Sent: 2009-12-09 13:41 To: 'boost-users(a)lists.boost.org' Cc: 'vicente.botet(a)wanadoo.fr' Subject: RE: [chrono] New Features + Bug fixes + Updated + documentation >Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

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Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

>Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> >Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

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[thread] variables in thread examples require 'volatile'?
by Gabriel Redner 09 Dec '09

09 Dec '09

Dear Boosters, I'm involved in a bit of a dispute in which a colleague is claiming that 'volatile' is necessary to make certain synchronization patterns correct. As part of my response I pointed out that the boost.thread examples don't use it, but he maintains his position - saying that the examples are flawed. I'm frankly somewhat out of my element here, and I'd like to get input from people who have presumably thought about this stuff a good deal. The example in question is here, under "synopsis": http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#t… The claim is that 'volatile' is needed on the boolean, otherwise the compiler might cache the boolean in a register, and the loop would never exit. He cites for support two articles: http://www.ddj.com/cpp/184403766 https://www.securecoding.cert.org/confluence/display/seccode/DCL17-C.+Bewar… Who's right? Thanks, -Gabe

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