March 2017 - Boost-users - lists.boost.org

Compare boost::system::error_category
by Christopher Pisz 27 Mar '17

27 Mar '17

The following comparison fails for an error whom outputs "asio.misc" for errorCode.category().name() and "end of file" for errorCode.message() If it claims to be in category asio.misc, then why does the if condition of (errorCode.category() == boost::asio::error::misc_category ) evaluate to false? Googling says that a boost::system::error_code can have the same value in more than one category, so I assume that in order to get the proper message and meaning we must compare boost::system::error_category as well as boost::system::error_code::value. How do we properly compare the category if this fails to work? Code in question: //-------------------------------------------------------------------------------------------------- std::string ClientSocketASIO::ErrorCodeToString(const boost::system::error_code & errorCode) { std::ostringstream debugMsg; debugMsg << " Error Category: " << errorCode.category().name() << ". " << " Error Message: " << errorCode.message() << ". "; if( errorCode.category() == boost::asio::error::misc_category ) { switch (errorCode.value()) { case boost::asio::error::eof: debugMsg << ". Server has disconnected."; break; case boost::asio::error::connection_refused: debugMsg << ". Connection Refused"; break; default: debugMsg << ". Unknown Error."; break; } } else { debugMsg << ". Unknown Error category."; } return debugMsg.str(); } -- View this message in context: http://boost.2283326.n4.nabble.com/Compare-boost-system-error-category-tp46… Sent from the Boost - Users mailing list archive at Nabble.com.

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Compile error with low_bits_mask_t
by Michael Kaes 27 Mar '17

27 Mar '17

Hi, I discovered a compile issue when using boosts integer_mask. The following simple program compiles fine with clang but fails with gcc. #include <iostream> #include <boost/integer.hpp> #include <boost/integer/integer_mask.hpp> int main() { typedef boost::low_bits_mask_t<2> mask_type_t; std::cout << mask_type_t::sig_bits << std::endl; return 0; } I took both clang and gcc from the svn trunk and boost in version 1.63. I did not have the time yet to dig through the boost implementation but I could not find anything in the issue tracker. So is this a compiler error of gcc or is this a bug in boost. I was able to find a stackoverflow question: http://stackoverflow.com/questions/40291949/boostinteger-mask-gcc-compiler-… And the answer sounds reasonable to me that this is a bug in boost. Can anyone confirm this? And why does clang accept this? Thanks, Michael

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Re: [Boost-users] Going insane trying to build boost for android
by Robert Dailey 26 Mar '17

26 Mar '17

On Thu, Mar 23, 2017 at 9:14 PM, Robert Dailey <rcdailey.lists(a)gmail.com> wrote: > How many months has it been of lost google searching, trying to beat > b2 into submission. I have no idea at this point how to build boost > for Android. Really hoping I get some help here... > > So to start, here are the versions I'm using: > > - Android NDK r14b > - Boost 1.63.0 > > I'm doing all of this on Windows 10, through command prompt. > > I want to use clang and libc++ to build boost for API 15. I figure the > easiest way is to generate a standalone toolchain using the NDK, so I > did that first: > >> %ANDROID_NDK%\build\tools\make_standalone_toolchain.py --arch arm --api 15 --stl libc++ "C:\android\_toolchains\arm-api-15" > > This generated the appropriate toolchain (I think). > > I then temporarily added this location to PATH: > >> set PATH=C:\android\_toolchains\arm-api-15\bin;%PATH% > > Then I ran bootstrap: > >> bootstrap.bat --with-toolset=clang > > Then I tried to build boost itself: > >> b2 --toolset=clang cxxflags="-stdlib=libc++ -std=c++14" threadapi=pthread --prefix=..\boost_android_arm --builddir=./ target-os=linux define=BOOST_FILESYSTEM_VERSION=3 --without-python link=static runtime-link=shared threading=multi variant=release install -j8 > > However I get failures when it tries to run the clang command: > > 'C:\code\_third_party\boost_1_63_0\\clang38++.exe' is not recognized > as an internal or external command > > I'm not sure why it's appending that absolute path (that's where my > current directory is set to, and where boost source is). It should > just be trying to use "clang++" but doesn't look like it is. > > From the output, it looks like it's trying to use clang correctly I think: > > "clang++" -c -x c++ -stdlib=libc++ -std=c++14 -O3 -Wno-inline -Wall > -pthread -stdlib=libc++ -std=c++14 -DBOOST_ALL_NO_LIB=1 > -DBOOST_FILESYSTEM_VERSION=3 -DBOOST_THREAD_USE_LIB=1 -DNDEBUG -I"." > -o "bin.v2\libs\wave\build\clang-linux-android\release\link-static\target-os-linux\threadapi-pthread\threading-multi\cpplexer\re2clex\aq.o" > "libs\wave\src\cpplexer\re2clex\aq.cpp" > > Am I going about this all wrong? How in the heck can I build boost for > android using the settings I specified above? So I beat on this a bit more and I'm past the clang path issue (it was some %~dp0/clang38++.exe stuff the batch file was doing which didn't resolve the right base path) What are the actual include directories I need to use for clang? I think that's the difficulty I'm running into now... errors like: clang-linux.compile.c++.without-pth bin.v2\libs\atomic\build\clang-linux-android\release\link-static\target-os-android\threadapi-pthread\threading-multi\lockpool.o In file included from libs\atomic\src\lockpool.cpp:16: In file included from .\boost/config.hpp:57: In file included from .\boost/config/platform/linux.hpp:15: C:/android/ndk/sources/cxx-stl/llvm-libc++/include\cstdlib:108:9: error: no member named 'strtold' in the global namespace using ::strtold; ~~^ My config jam: import common ; import configure ; import build-system ; import generate ; import modules ; import option ; import os ; import package ; import path ; import project ; import regex ; import set ; import targets ; import feature ; import property ; local androidNDKRoot = C:/android/ndk ; # put the relevant path using clang : android : $(androidNDKRoot)/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++ : <compileflags>-std=c++14 <compileflags>-stdlib=libc++ <compileflags>--sysroot=$(androidNDKRoot)/platforms/android-15/arch-arm <compileflags>-I$(androidNDKRoot)/sources/android/support/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++abi/include <compileflags>-I$(androidNDKRoot)/sources/cxx-stl/llvm-libc++/include <compileflags>-fno-strict-aliasing <compileflags>-D__GLIBC__ <compileflags>-DANDROID <compileflags>-D__ANDROID__ <compileflags>-D_GLIBCXX__PTHREADS <compileflags>-D__arm__ <compileflags>-D_REENTRANT <compileflags>-O2 <compileflags>-DNDEBUG ; And I'm running this command: b2 ^ --user-config=clang-android.jam ^ target-os=android ^ toolset=clang-android ^ threadapi=pthread ^ link=static ^ runtime-link=shared ^ threading=multi ^ variant=release ^ --prefix=..\boost_android_arm ^ --builddir=./ ^ --without-python ^ -j1 ^ install

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[release] Boost 1.64.0 Beta 1
by Rene Rivera 26 Mar '17

26 Mar '17

Boost release 1.64.0 beta 1 is now available at: <https://dl.bintray.com/boostorg/beta/1.64.0.beta.1/source/> The SHA256 checksums are as follows: 8f0ba6b73fad15115049f9b3e7e27eae43be10a94b51a57142f3a27e55ef4beb boost_1_64_0_b1.7z b5c5abf127a3f723dafcc7cf55876c1bda9f014fb1b117f6a7f769e3cc407c4f boost_1_64_0_b1.tar.bz2 a7fe98a9a9f615f6fa68d8ea09ce725d19e3a4fe4719c21c9db29dff88b3b6e3 boost_1_64_0_b1.tar.gz 593005661af8dfe132b2b16bc2cd41339e6acd58456913f353d765090d7868f7 boost_1_64_0_b1.zip For details of what's in the release, see < http://www.boost.org/users/history/version_1_64_0.html>. Note that the links to files on this web page are for the final release - use the link above to get the beta files. There are also pre-built libraries provided by Tom Kent here: <https://dl.bintray.com/boostorg/beta/1.64.0.beta.1/binaries/> Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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License questions
by Julian D. 25 Mar '17

25 Mar '17

I am making a confidential commercial closed-source program, and Boost's libraries seem useful for me. I can't tell if the Boost license allows me to include it in closed-source. Would anybody know?

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Re: [Boost-users] License questions
by Julian D. 24 Mar '17

24 Mar '17

That appears to be the definition of what license they wanted, not the actual license. The license body makes it unclear if I can use this in a closed-source commercial environment On Thu, Mar 23, 2017 at 3:51 PM, <boost-users-request(a)lists.boost.org> wrote: > > Message: 5 > Date: Thu, 23 Mar 2017 17:54:04 +0100 > From: Mateusz Loskot <mateusz(a)loskot.net> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] License questions > Message-ID: > <CABUeae_a-cNCdw00fYN4Gyb_a7Gk_QOo7cARXNo3Lh8eXAAVtQ@ > mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On 23 March 2017 at 17:38, Julian D. via Boost-users > <boost-users(a)lists.boost.org> wrote: > > I am making a confidential commercial closed-source program, and Boost's > > libraries seem useful for me. I can't tell if the Boost license allows > me to > > include it in closed-source. Would anybody know? > > http://www.boost.org/users/license.html#requirements > > 2nd bullet > > Best regards, > -- > Mateusz Loskot, http://mateusz.loskot.net

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[format] warning...warning...warning
by Arnaud RICHARD 24 Mar '17

24 Mar '17

Hello, I'm a complete Boost newbie. I've been told very often that boost is the way to go for serious C++ coding, and I was not surprised to see such emphasis on the home page: "We aim to establish "existing practice" and provide reference implementations so that Boost libraries are suitable for eventual standardization" So when I used the format library on my existing (non-trivial) project and first compiled... I was very very surprised to get my neat compilation console flooded with hundreds of warnings ! I acknowledge I activate many many warnings: CXXFLAGS+=-Wall -Wextra -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization \ -Wformat=2 -Winit-self -Wlogical-op -Wmissing-include-dirs \ -Wnoexcept -Woverloaded-virtual -Wredundant-decls -Wshadow \ -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 \ -Wswitch-default -Wundef -Wunused The warnings were as trivial as (for example): ../ext/boost/boost/type_traits/is_default_constructible.hpp:16:22: warning: "BOOST_GCC_VERSION_WORKAROUND_GUARD" is not defined [-Wundef] #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700) ../ext/boost/boost/format/parsing.hpp:435:67: warning: conversion to 'std::vector<boost::io::detail::format_item<char, std::char_traits<char>, std::allocator<char> >, std::allocator<boost::io::detail::format_item<char, std::char_traits<char>, std::allocator<char> > > >::size_type {aka unsigned int}' from 'int' may change the sign of the result [-Wsign-conversion] string_type & piece = (cur_item==0) ? prefix_ : items_[cur_item-1].appendix_; I understand they are only warning and the code is functionally correct and standard-wise correct. Personally when I face such false warnings in my code, I change the code to remove the warning so that if a warning does make sense, I can notice it. I thought a reference implementation would be written with such policy. There's no way I'm gonna read each of the hundreds of messages to understand if it is a mistake in my source code or a "shortcut" in boost library. So this is my first user experience. Not impressed at all. Boost will not be my reference.

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boost asio client socket connection to servers behind a public IP address
by jupiter 24 Mar '17

24 Mar '17

Hi, I need to run boost asio client socket connections to remote servers via a remote proxy server, the remote proxy server has a public IP address, but none of remote servers have public IP addresses. Appreciate any clues or samples. Thank you.

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[TypeErasure] efficiency problem
by Mikhail Strelnikov 24 Mar '17

24 Mar '17

Hello! In following code TypeErasure creates two copies of s, while Boost.Any creates no copies at all. any x{ s{} }; any y{ std::move(x) }; any z; z = std::move(y); There is move constructor for type_erasure::any, but it does allocate memory and calls copy constructor for s. Why? And why there is no move assignment operator in type_erasure::any? Thanks. Full source: https://wandbox.org/permlink/iHs5a0bjzXsBtpwC

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Re: [Boost-users] [boost] [release] Boost 1.64.0 Beta 1
by Rene Rivera 23 Mar '17

23 Mar '17

On Thu, Mar 23, 2017 at 11:04 AM, Olaf van der Spek <ml(a)vdspek.org> wrote: > VS2015 / W10: > > boost_1_64_0>bootstrap.bat > > Building Boost.Build engine > HRESULT was unexpected at this time. > Could you try building b2.exe directly: === cd tools\build\src\engine built.bat === And posting the output? -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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