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

[asio]Winsock.h
by Robert Jones 13 Jul '09

13 Jul '09

What's the deal with Winsock.h & Asio? I can see there's been chatter on this topic before, but not what the result is. Thanks, Rob.

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[Pool] Overhead in using singleton_pool?
by Julius Ziegler 13 Jul '09

13 Jul '09

Hello list, I would like to know if there is any overhead in using singleton_pool instead of a simple pool object. Especially, I guess there could be some overhead due to synchronisation, as the singleton interface is guaranteed to be thread safe. I currently have some trouble with deallocation order of statics at program exit (I am using a static pool object), but everything works fine when I use singleton_pool instead. Are there any disadvantages (runtime) when using singleton_pool? Thanks! Julius

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Re: [Boost-users] [Program Options] Difficulty compiling for static runtime library
by Lindley M French 13 Jul '09

13 Jul '09

> Lindley M French wrote: > > I have a large project that I'd like to use Boost.Program > Options with. Most of the other Visual Studio 2005 projects are > set to link against "Multithreaded" or "Multithreaded Debug" > rather than the DLL variants of same; so of course, I need to > build Program Options accordingly. > > > > I tried this: > > bjam.exe" release --runtime-link=static program_options > > > > But that did not produce the library that VS wants, which is: > > > > libboost_program_options-vc80-mt-s-1_39.lib > > > > Try > bjam release runtime-link=static --with-program_options > > In Christ, > Steven Watanabe I tried that, it produced the following output: bjam.exe release --runtime-link=static --with-program_options 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 warning: No toolsets are configured. warning: Configuring default toolset "msvc". warning: If the default is wrong, your build may not work correctly. warning: Use the "toolset=xxxxx" option to override our guess. warning: For more configuration options, please consult warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html Building C++ Boost. After the build, the headers will be located at C:\Documents and Settings\lfrench\Desktop\MADCAT\atg-madcat-dev\im_nav\projects\madcat\third-party-software\boost_1_39_0 The libraries will be located at C:\Documents and Settings\lfrench\Desktop\MADCAT\atg-madcat-dev\im_nav\projects\madcat\third-party-software\boost_1_39_0\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 523 targets... ...updating 15 targets... common.mkdir bin.v2\libs\program_options\build\msvc-8.0\release\link-static common.mkdir bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\cmdline.obj cmdline.cpp libs\program_options\src\cmdline.cpp(272) : warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning) compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\config_file.obj config_file.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\options_description.obj options_description.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\parsers.obj parsers.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\variables_map.obj variables_map.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\value_semantic.obj value_semantic.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\positional_options.obj positional_options.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\utf8_codecvt_facet.obj utf8_codecvt_facet.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\convert.obj convert.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\winmain.obj winmain.cpp msvc.archive bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\libboost_program_options-vc80-mt-1_39.lib common.copy stage\lib\libboost_program_options-vc80-mt-1_39.lib bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\libboost_program_options-vc80-mt-1_39.lib 1 file(s) copied. ln-NT stage\lib\libboost_program_options-vc80-mt.lib "NT symlinks not supported yet, making copy" 1 file(s) copied. ...updated 15 targets... It doesn't appear to be using the correct filename.

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boost autolinkig issue - library names on vc9?
by Maróy Ákos 13 Jul '09

13 Jul '09

Hi, I'm having an issue with boost autolinking on Visual Studio 9 (2008), with the boost-pything library. the boost build process generates libraries of the name: libboost_XXX-vc90-mt-gd-1_39.lib and the like, but interestingly autolinkig fails with the following message: 1>LINK : fatal error LNK1104: cannot open file 'boost_python-vc90-mt-gd-1_39.lib' am I doing something wrong? Akos

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Linking to release libs in debug build
by John Krajewski 13 Jul '09

13 Jul '09

I've noticed my boost libs are slowing my game down incredibly in my debug builds. I'd like to link to release boost libs even in Debug, is that possible and will it cause any problems? Secondly, I'm not sure how to do this. Boost is somehow auto-linking to the correct lib for my build (I've downloaded the libs precompiled for visual studio). Does anyone know how this auto-linking process works and how I can override it to link to release libs instead of debug? Thanks! -John

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how to link libraries in Jamroot?
by Arne Kalaghan 13 Jul '09

13 Jul '09

Hello, I am not very experienced with boost. I try to learn how to use the boost.thread library. After early bjam compilation errors (undefined references, because the boost_thread library was not linked), I found that this Jamroot creates my executable successfully: exe threadtest : threadtest.cpp : <library>/usr/lib/libboost_thread-gcc42-mt-1_34_1.so.1.34.1 ; Is it possible to simplify the <library> parameter to something like "boost_thread"? The reason is that I am developing on different systems with different boost versions, so that I don't want to hardcode the library version in the Jamroot. I thought that the boost.build system should be smart enough that it finds the appropriate library file if you only tell it "use the thread library please". How can I make the Jamroot independent from the boost installation and, more importantly, from the operation system? Best wishes, A. Kalaghan

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[array] GCC 4.2 warnings with array initialization
by Allen Cronce 13 Jul '09

13 Jul '09

Hi all, When building with boost 1.36 and GCC 4.2 under Xcode, the following code produces a warning: boost::array<int, 2> warningArray = { 1, 2 }; warning: missing braces around initializer for 'int [2]' We see no warnings with GCG 4.0. We have a zero warning tolerance. All warnings are counted as errors. The boost::array documentation indicates that the single brace approach should work for conforming compilers, according to 8.5.1 (11) of the Standard. So does that mean that GCC 4.2 is non-conforming? Sure enough, when I change the code to include a second set of braces, the warning is gone: boost::array<int, 2> noWarningArray = { { 1, 2 } }; But this is a problem as we move to GCC 4.2 because a) we use initialized arrays all over the place, so this means a lot of little changes, and b) requiring an extra set of braces is counter intuitive and irritating at best. I don't like the idea of making the above code changes, and I don't want to globally disable the warning because it might be useful for other code. Does anyone have a better solution? Thanks in advance for any suggestions. Best, -- Allen Cronce

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Why can I not put a break in this part of asio sample code?
by Ozgur Ozturk 13 Jul '09

13 Jul '09

Hi, I am using the async_tcp_echo_server.cpp<http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/example/echo/async…>sample code to understand asio. when I am tracing code in visual studio, it doeasn't let me put a breakpoint inside start() function in session class. Will it be run in another thread? is that the reason for not being able to put a breakpoint? Though it seems I can put breakpints for other codes that run in other threads... Why can I not put here? I tried to break at the point calling this function and step into from there. it jumps to async_receive(...) function in win_iocp_socket_service.hpp file. Could someone help me understand what is going on, or give me some pointers about how to trace such code? TIA, Ozgur PS: here is the related code: class session { //... //this is the part I can not put breakpoint. void start() { socket_.async_read_some(boost::asio::buffer(data_, max_length), boost::bind(&session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } Best regards, Ozgur (Oscar) Ozturk www.DrOzgur.com +1 (614) 805-4370

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[thread] thread specific variable instead of thread specific pointer?
by Frédéric Bron 13 Jul '09

13 Jul '09

I would like to have a variable specific to each thread. This means I would like to use the same variable name and that this name corresponds to different instances in different threads. For example, I would like to build a log stream that writes in different files in different threads. For example I would like to have a variable "flog" that behaves like a std::ostream: flog << "hello world!" ; I have found the two following solutions based on the use of boost::thread_specific_ptr but I am not fully satisfied with them: boost::thread_specific_ptr<std::ofstream> flogs ; // first solution using a function std::ostream &flog() { return *flogs.get() ; } // but I then have to add () after flog: flog() << "hello world!" ; // second solution using a macro #define flog flog() // but macros are not very recommended in C++. Any other idea that would allow me to write flog << "hello world!" like with std::cout? Note that I also tried to write a class derived from ostream with only one instance flog. This class had a special stream buffer using a thread specific pointer. However, the flog instance stores some informations like the precision of real numbers (flog << setprecision(10) for example) and the output of one thread can then interfere with the output of other threads... Regards, Frédéric

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Some of Boost Regex++ not recognized
by lsimons 13 Jul '09

13 Jul '09

<hoping this isn't a double post. Had some trouble with connection first time> I really appreciate the work done on the Boost libraries. I've used them in other projects and it's always been a welcome relief. For my current project, I'm trying to use the Boost Regex++ library in MSVC++ 6.0 (under Vista) to do some basic regex. I've installed the libraries as per the tutorial and added the Boost path to my compiler and linker includes. A lost of the basic functionality works fine, but I'm having trouble with autocompletion. The bigger issue is that certain parts of the library seem to throw the compiler. Ex that comiples fine: #include "stdafx.h" #include <boost/regex.hpp> #include <string.h> using namespace std; using namespace boost; int main(int argc, char* argv[]) { regex expr("^&[a-zA-Z0-9_ ]+,\\s+[a-zA-Z0-9_ ]+,\\s+[0-9].+"); string text = "&AirSpeed_Error, tla_error, 2 \\test stuff"; bool result; result = regex_match(text,expr); if (result == true) cout << "Match" << endl; else cout << "No Match" << endl; return 0; } If I add the line "match_flag_type flags = match_default;" I receive three errors: C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'match_flag_type' : undeclared identifier C:\Users\me\Documents\test\test.cpp(30) : error C2146: syntax error : missing ';' before identifier 'flags' C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'flags' : undeclared identifier Error executing cl.exe. I think I might simply have something misconfigured in MSVC6, and I would appreciate any comments or suggestions towards resolving the issue. Please let me know if there's any additional info I can provide. Thanks, Louis -- View this message in context: http://www.nabble.com/Some-of-Boost-Regex%2B%2B-not-recognized-tp24219036p2… Sent from the Boost - Users mailing list archive at Nabble.com.

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