February 2016 - Boost-users

Boost and v8
by Daniel Burchardt 06 Feb '16

06 Feb '16

Hi, I try create v8 module to python used boost and i have problem: #include <iostream> using namespace std; #include <stdio.h> #include <stdlib.h> #include <string.h> #include "include/libplatform/libplatform.h" #include "include/v8.h" using namespace v8; const char* say_hello(const char* name) { return name; } #include <boost/python/module.hpp> #include <boost/python/def.hpp> #include <boost/python/class.hpp> using namespace boost::python; BOOST_PYTHON_MODULE(hello) { class_<V8, boost::noncopyable>("V8", no_init) .def("Initialize", &V8::Initialize).staticmethod("Initialize"); def("say_hello", say_hello); } compile process is ok but when i try import hello in python i see error: /hello.so: undefined symbol: _ZN2v82V810InitializeEv Thanks for help

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[MSM][MPL] Can't compile FSM with > 20 transitions (solved)
by Carlos Santos 05 Feb '16

05 Feb '16

Hi there, I am using boost v1.59 and I am having trouble in compiling a MSM state machine with more than 20 transitions. I followed the Q&A and added the following lines BEFORE any boost include: #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS #define BOOST_MPL_LIMIT_VECTOR_SIZE 30 // or whatever you need #define BOOST_MPL_LIMIT_MAP_SIZE 30 // or whatever you need but now instead of getting the previous error: error: wrong number of template arguments (21, should be 20) I get this one: /usr/local/include/boost/multi_index/tag.hpp:75:67: error: wrong number of template arguments (30, should be 20) mpl::vector<BOOST_PP_ENUM_PARAMS(BOOST_MULTI_INDEX_TAG_SIZE,T)>, I was just finishing this email when I found a solution. Adding only the following header #include "boost/mpl/vector/vector30.hpp" and explicitly declaring the transition table as a numbered mpl::vector (yep you have to count the rows...) struct transition_table : mpl::vector21< ... > solves the problem. Can you suggest me a better solution for this? Thanks! *Carlos Santos *

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[Test] BOOST_CHECK_EQUAL can't compare scoped enumerations
by Merrill Cornish 05 Feb '16

05 Feb '16

I'm running Windows 10, 64-bit, MinGW64 with GCC 5.3 64-bit, and BOOST_1_60_0 64-bit. Here is the stripped down version of what's failing: enum class UsedFor { NOTIFY_INPUT, CONST_INPUT, VAR_INPUT, NOTIFY_RESULT, VAR_RESULT}; UsedFor mUse = UsedFor::NOTIFY_INPUT; BOOST_CHECK(mUse == Operand::UsedFor::NOTIFY_INPUT); // BOOST_CHECK_EQUAL(mUse, Operand::UsedFor::NOTIFY_INPUT); If BOOST_CHECK_EQUAL() is commented out, BOOST_CHECK() complies and executes without error. However, // BOOST_CHECK(mUse == Operand::UsedFor::NOTIFY_INPUT); BOOST_CHECK_EQUAL(mUse, Operand::UsedFor::NOTIFY_INPUT); If BOOST_CHECK() is comment out, BOOST_CHECK_EQUAL() gets a template barf with the general comment, " template argument deduction/substitution failed:". Here are some of the complaints: D:\Boost_1_60_0/boost/test/tools/detail/print_helper.hpp:50:14: note: cannot convert 't' (type 'const DiGSE::Operand_Class_Test_Suite::Operand_Default_Constructor_Test::test_method()::UsedFor') to type 'std::_Setw' ostr << t; ^ D:/Program Files/mingw-w64/x86_64-5.3.0-posix-seh-rt_v4-rev0/mingw64/x86_64-w64-mingw32/include/c++/iomanip:208:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setprecision) operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f) D:\Boost_1_60_0/boost/test/tools/detail/print_helper.hpp:50:14: note: cannot convert 't' (type 'const DiGSE::Operand_Class_Test_Suite::Operand_Default_Constructor_Test::test_method()::UsedFor') to type 'std::_Setprecision' ostr << t; ^ At this point, it seems to be complaining about every io manipulator in existence. D:\Boost_1_60_0/boost/test/tools/detail/print_helper.hpp:50:14: note: mismatched types 'const std::piecewise_linear_distribution<_RealType>' and 'const DiGSE::Operand_Class_Test_Suite::Operand_Default_Constructor_Test::test_method()::UsedFor' ostr << t; Then it gets to the point of, apparently, dragging out all of the error messages it doesn't get to use very often: mismatched types*'const std::chi_squared_distribution<_RealType>' *and 'const DiGSE::Operand_Class_Test_Suite::Operand_Default_Constructor_Test::test_method()::UsedFor' ostr << t; ^ For the time being, I can simply use the explicit == check, but it looks like there's a problem here. Merrill Cornish

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[ANN] build2 - C++ build toolchain
by Boris Kolpackov 03 Feb '16

03 Feb '16

Hi, build2 is an open source, cross-platform toolchain for building and packaging C++ code. It includes a build system, package manager, and repository web interface. We've also started cppget.org, a public repository of open source C++ packages. This is the first alpha release and currently it is more of a technology preview rather than anything that is ready for production. We have tested this version on various Linux'es, Mac OS, and FreeBSD. There is no Windows support yet (but cross-compilation is supported). The project's page is: https://build2.org For those who need to see examples right away, here is the introduction: https://build2.org/build2-toolchain/doc/build2-toolchain-intro.xhtml Enjoy, Boris

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BOOST_LOG_TRIVIAL destination change
by Marc Paschover 02 Feb '16

02 Feb '16

I am working on a native Excel add-in (using XLW+), and I have been using Boost.Logging to output some diagnostic information, using BOOST_LOG_TRIVIAL. I would like to see this information in the Output window of Visual Studio. It seems like I somehow need to change the destination to boost::logging::destination::dbg_window, but I haven't been able to figure out a way to do this globally. Is there a way to do this? Thanks, Marc.

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Boost 1.60: boost::archive::iterators bug?
by Ernest Zaslavsky 02 Feb '16

02 Feb '16

Hi, Recently I've noticed that Base64 encoded data produced by implementation I use and implementation used by chromium project sometimes are not the same. It happened only once but it was enough for me to start worrying. The implementation is quite simple, and I guess borrowed it from somewhere, like SO or something. The code as following: using it_base64_t = bai::base64_from_binary<bai::transform_width<std::string::const_iterator, 6, 8>>; namespace bai = boost::archive::iterators; auto writePaddChars = (3 - input.length() % 3) % 3; std::string base64(it_base64_t(input.begin()), it_base64_t(input.end())); base64.append(writePaddChars, '='); simple and elegant. However, today I wrote a short test which takes a chapter from 'Alice's Adventures in Wonderland' and encodes it. As well, I used two different online encoder to encode the same text, both online encoders produce the same data. However above code produced the same code until character 1029 and then it is different from what it should be. Then later, it gets back to the same output as produced by online encoders. So my question is, any chance it is a bug in archive::iterators or it is something in the above code? Coliru is down, so, full code is here http://pastebin.com/JxMsMeV2 [Read More]<http://feeds.feedburner.com/~r/sizmek-blog/~6/1> [http://www.sizmek.com/Sizmek.png]<http://www.sizmek.com/>

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Building Boost 1.60 with VS2015 - 32 bit compiler is always selected
by Tiago Gehring 01 Feb '16

01 Feb '16

Hi, I'm trying to build Boost 1.60 with Visual Studio 2015 Update 1 in 64-bit mode but it seems to be ignoring the address-model=64 parameter and always builds a 32-bit version (I called b2 from the VS2015 Native tools for x64 command prompt): -- C:\Users\Tiago\code\boost_1_60_0>*b2 --toolset=msvc-14.0 variant=release link=static threading=multi address-model=64 architecture=x86* Performing configuration checks *- 32-bit : yes* - arm : no - mips1 : no - power : no - sparc : no - x86 : yes .... C:\Users\Tiago\code\boost_1_60_0>*cl* Microsoft (R) C/C++ Optimizing Compiler *Version 19.00.23506 for x64* Copyright (C) Microsoft Corporation. All rights reserved. usage: cl [ option... ] filename... [ /link linkoption... ] --- I saw in some ond discussion mentions to explicitly select the compiler version (I also have VS2010 and VS2012 installed) and environment variables batch file (in the project-config.jam file) but this didn't help either. Any help is really appreciated. Best regards, Tiago Gehring

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Re: [Boost-users] asio: implementing sock->receive like behavior eith async_read_some
by Bjorn Reese 01 Feb '16

01 Feb '16

On 01/28/2016 01:56 PM, Lloyd wrote: > I am using asio to read some data from SSL socket. asio tcp socket > implements a "receive" function, but ssl socket doesn't have an > implementation for "receive". In the code sample given below I wish to > implement this kind of behavior. > > eg > > { > ... > sock.async_read_some(...); > //continue the execution only after the above call finishes. > } Why are you using an asynchronous operation instead of simply calling ssl::stream::read_some()?

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