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Re: [boost] expected/result/etc
by Emil Dotchevski 13 Feb '16

13 Feb '16

On Wed, Jan 27, 2016 at 10:49 PM, Michael Marcin <mike.marcin(a)gmail.com> wrote: > So looking a few of these libraries/proposals I have a few things I'm > interested in. > > - Is it at least as good as a simple hand-rolled solution? > - Can you transport error codes through layers without knowing specifics > of an error? > > For the second Niall's outcome/result handles very well I think. > std::error_code and std::exception_ptr transport is good enough for almost > any reasonable type agnostic error transport. > Have you considered using Boost Exception? It lets you add arbitrary data to exception objects, even after they have been thrown, regardless of their type -- see http://www.boost.org/doc/libs/release/libs/exception/doc/error_info.html. The general idea is to adopt a strategy where the exception objects are augmented with any, even platform-specific relevant data, which then the catch site can analyze to choose the correct handling. Cheers, Emil

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[type_traits] ICE with msvc-12.0
by Steven Watanabe 13 Feb '16

13 Feb '16

AMDG I'm getting boost\type_traits\common_type.hpp(43): fatal error C1001: An internal error has occurred in the compiler. (compiler file 'msc1.cpp', line 1325) To work around this problem, try simplifying or changing the program near the locations listed above. which makes this toolset basically unusable. Oddly enough, I don't see this error in the regression matrix. Does anyone know what's up with this? > cl Microsoft (R) C/C++ Optimizing Compiler Version 17.00.50727.1 for x86 Copyright (C) Microsoft Corporation. All rights reserved. scratch.cpp: #include <boost/type_traits/common_type.hpp> int main() { boost::type_traits::common_type<int, char, long>::type x = 0; } > cd libs/type_traits > git log commit 1f3a3a1553dc316ed002354dce3ba3f081b2e102 Author: jzmaddock Date: Wed Jan 13 10:50:22 2016 +0000 Fixes for older GCC versions, see issue 11904. ... > dir boost ... 02/25/2015 08:26 PM <JUNCTION> type_traits [...\libs\type_traits\include\boost\type_traits] ... In Christ, Steven Watanabe

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[regression] Winapi submodule tests missing
by Andrey Semashev 13 Feb '16

13 Feb '16

Hi, The winapi submodule tests are missing from the test matrix, although the status/Jamfile.v2 lists it. This is both on develop and master. Is there something I should do to make the tests appear?

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Re: [boost] expected/result/etc
by Giovanni Piero Deretta 13 Feb '16

13 Feb '16

On 12 Feb 2016 11:20 a.m., "Niall Douglas" <s_sourceforge(a)nedprod.com> wrote: [...]. > > LLVM, for the record, has implemented a very similar "universal" > exception handling mechanism which allows exception throws to > traverse language boundaries within LLVM, and my great hope is that > once LLVM becomes universal on POSIX platforms someone will go ahead > and replace signals with structured exception handling. As far as I know LLVM simply implements unwinding as mandates by the Itanium ABI, which is already the de facto standard on many unices. Is this what you are referring to? This is completely orthogonal with handling OS/machine exceptions (segfaults, division by zero, etc..). And with right compiler and flag there are ways to convert (synchronous) signals to exceptions. This actually required to support the semantics of languages other than the C family, like Java and Ada. Notably, it doesn't actually work with LLVM, but it does with gcc. -- gpd

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[filesystem] temp_directory_path and Android devices (repost)
by doodad-js Admin 12 Feb '16

12 Feb '16

(sorry for the repost, but someone told me that I should include "filesystem" in the subject) Hi, I have read the specs (http://www.boost.org/doc/libs/1_60_0/libs/filesystem/doc/reference.html#tem p_directory_path) and found the following issues with Android devices: - It should first try to get the application's cache directory from the API level 1 "getCacheDir" so that temporary files created by the application can be easily and automatically removed. - The function fails back to the hard coded value "/data/local/tmp". But I think it should use the environment variable "ANDROID_DATA" when available and append "/local/tmp" to it. - The "/data/local/tmp" folder is denied access on my Android device. I don't have any other suggestion than the application's cache folder like I first mentioned. I'm not a core developer and the information provided on this email maybe erroneous or incomplete. My apologies if I'm entirely wrong. Thanks, Claude Petit

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Contribution to Boost as Developer
by aman kumar singh 11 Feb '16

11 Feb '16

Developers, I am Aman Kumar Singh,Senior Year,NIT Mizoram,India(Computer Science and Engineering).I am new to open source development. I like coding especially in C++.I have 6 years of working experience in C++.I am very much interested in contributing to open source development especially in Boost.I want to apply for Google Summer of Code 2016 in future.Can somebody help me out.I am ready to dedicate my full time to it once I get aware of the system fixing bugs and further contributing to big projects. I am left with very less time for GSoC and this time I want to be part of it.Please help me out. Thanking you, Aman Kumar Singh, NIT Mizoram, India

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problem with ASIO
by Juan Dent 10 Feb '16

10 Feb '16

Thank you so much Bjorn Reese!! you solved my problem with ASIO. My instincts were correct in that the stream was destroying the std::cout. ::dup() solves this. Best regards, Juan

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Re: [boost] Problem with ASIO
by Bjorn Reese 10 Feb '16

10 Feb '16

On 02/10/2016 02:27 AM, Juan Dent wrote: > posix::stream_descriptor stream{ioservice, STDOUT_FILENO}; Here you take over ownership of stdout, so it will be closed by the stream destructor. A quick fix is to pass a copy of the file descriptor with ::dup(STDOUT_FILENO) as shown in the posix_chat_client.cpp example.

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temp_directory_path and Android devices
by doodad-js Admin 10 Feb '16

10 Feb '16

Hi, I have read the specs (http://www.boost.org/doc/libs/1_60_0/libs/filesystem/doc/reference.html#tem p_directory_path) and found the following issues with Android devices: - It should first try to get the application's cache directory from the API level 1 "getCacheDir" so that temporary files created by the application can be easily and automatically removed. - The function fails back to the hard coded value "/data/local/tmp". But I think it should use the environment variable "ANDROID_DATA" when available and append "/local/tmp" to it. - The "/data/local/tmp" folder is denied access on my Android device. I don't have any other suggestion than the application's cache folder like I first mentioned. I'm not a core developer and the information provided on this email maybe erroneous or incomplete. My apologies if I'm entirely wrong. Thanks, Claude Petit

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[ANN] build2 - C++ build toolchain
by Boris Kolpackov 10 Feb '16

10 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 (where we hope to see Boost one day). 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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