October 2011 - Boost - lists.preview.boost.org

[test] Still having issues
by John Maddock 16 Oct '11

16 Oct '11

I'm still having a lot of issues with the latest Boost.Test not building: On Win32 with Intel's 11.1 and 12.1 compilers I see: ..\..\..\boost/test/impl/execution_monitor.ipp(104): error: invalid redeclaration of type name "_invalid_parameter_handler" (declared at line 228 of "C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\stdlib.h") typedef void* _invalid_parameter_handler; And on Ubuntu Linux with gcc I see: gcc.compile.c++ /home/john/bin/boost/bin.v2/libs/test/build/gcc-4.4.3/debug/link-static/unit_test_main.o In file included from ../../../libs/test/src/unit_test_main.cpp:16: ../../../boost/test/impl/unit_test_main.ipp: In function 'int boost::unit_test::unit_test_main(boost::unit_test::test_suite* (*)(int, char**), int, char**)': ../../../boost/test/impl/unit_test_main.ipp:97: error: 'getchar' is not a member of 'std' "/usr/local/gcc/4.4.3/bin/g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -pedantic -g -DBOOST_ALL_NO_LIB=1 -I"../../.." -c -o "/home/john/bin/boost/bin.v2/libs/test/build/gcc-4.4.3/debug/link-static/unit_test_main.o" "../../../libs/test/src/unit_test_main.cpp" Probably a missing <cstdio> include? John.

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[1.48] Reminder: merge fixes by Monday!
by Eric Niebler 14 Oct '11

14 Oct '11

Just a reminder that as of Monday, the release branch will be closed except for permission by a release manager. If you have fixes to merge to the release branch, please try to get them in over the weekend. Here's the schedule: October 10: The release branch was closed for major code changes. It is still open for serious problem fixes and docs changes. October 17: branches/release closed for all library changes except when specific permission given by release manager(s). October 24: Beta target date. Further betas and/or release candidates as feedback dictates. November 7: Release target date View Boost calendar: http://tinyurl.com/4xacpyj Thanks, -- Eric Niebler BoostPro Computing http://www.boostpro.com

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Is Boost interested in the Boost-based Base64 library
by Denis Shevchenko 14 Oct '11

14 Oct '11

Hi all! Not so long ago I was looking for a solution to Base64 encoding/decoding. In this page - http://www.boost.org/doc/libs/1_46_1/libs/serialization/doc/dataflow.html - I found example of such solution, with 'base64_from_binary' and 'transform_width' iteartors. But it is just a "blank", not ready-to-use solution. I created solution. But I definitely know many developers looking for a simple, ready-to-use, header-only and 'real C++' solution for Base64. So I want to offer you such solution. Some examples: int main() { std::string my_text = "My text for encoding!"; std::string encoded_text = boost::base64().encode( my_text ); std::string my_text_again = boost::base64().decode< std::string >( encoded ); } For binary data: int main() { typedef std::vector< unsigned char > binary_string; binary_string my_bin = list_of( 0xFF )( 0xAA )( 0x01 ); std::string encoded_bin = boost::base64().encode( my_bin ); binary_string my_bin_again = boost::base64().decode< binary_string >( encoded ); } For streams: int main() { boost::filesystem::ifstream my_jpeg( "/some/path/to/my/image" ); // fstream checking omitted... std::string encoded_jpeg = boost::base64().encode( my_jpeg ); boost::filesystem::ofstream my_jpeg_again( "/some/path/to/decoded/image" ); // fstream checking omitted... boost::base64().decode( encoded_jpeg, my_jpeg_again ); } This is first variant. IMHO such solution will be useful for Boost users. What you think about it? - Denis

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[date_time] performance tests
by Greg Rubino 13 Oct '11

13 Oct '11

Hi all, Does anyone know of/have an open source suite of performance tests for Boost.Date_Time? If not, I'll post back with whatever I come up with. Thanks, Greg

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Checking interest in to_string functions
by Antony Polukhin 13 Oct '11

13 Oct '11

As was mentioned in `[boost] to_string(v)` 1) Functions to_string and to_wstring are part of the upcoming C++0x standard. However, there are no functions for char16_t and char32_t conversions. 2) Some users can't use C++11 in some projects for quite some time, but can use boost. 3) "to_string(5)" is a lot shorter than "lexical_cast<std::string>(5)". Some users would like to use a shorter form. Is there interest in stoi, stoll, stof, to_string, to_wstring, to_u16string, stod and other functions for char, wchar_t, char16_t and char32_t conversions? Shall I add them to lexical_cast library, or as a separate conversion library? Best regards, Antony Polukhin

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[ASIO] tcp::socket::async_connect() connections count
by Jim Xochellis 13 Oct '11

13 Oct '11

Hi list, I am testing a slightly modified version of the chat_client/chat_server ASIO examples and I have noticed that, immediately after the tcp::socket::async_connect() call from inside the chat_client constructor, the client is creating and establishing not one, but three TCP connections, only one of which is targeting to the server-port. Furthermore, calling repeatedly the async_connect() seems to constantly create three connections per call. I have also noticed that other programs in my system, which also communicate via TCP (ie the hyper-terminal), only open one connection at the client side. Is this async_connect() behavior, which I have mentioned above, the expected/natural behavior, or maybe I am doing something wrong? If this behavior is expected, is there a reason for it? Do I have a choice to change it? Please note that there is a near-4000 outbound concurrent connections default limit in many Windows-XP installations, hence this question has a practical meaning. Configuration informations: OS: Windows XP Pro SP3 Boost version: 1.46.1 IDE: MVS 2005 Thank you in advance, Jim Xochellis ----- Homepage: https://sites.google.com/site/xochellis/ -- View this message in context: http://boost.2283326.n4.nabble.com/ASIO-tcp-socket-async-connect-connection… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[filesystem] scoped_file feature request?
by Beman Dawes 13 Oct '11

13 Oct '11

There is a long outstanding feature request, #1090 from Marcus Lindblom, requesting the following be added to Boost.Filesystem: class scoped_file { public: explicit scoped_file(const boost::filesystem::path& file) : m_path(file) {} ~scoped_file() { boost::filesystem::remove(m_path); } private: boost::filesystem::path m_path; }; My weakly held opinion is that this request should be rejected. Rationale: Easy enough for users to do themselves, so it doesn't justify the additional surface area it would add to of the library. Does anyone have a killer argument for adding it? --Beman

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Dennis Ritchie passed away
by Nevin Liber 13 Oct '11

13 Oct '11

<https://plus.google.com/101960720994009339267/posts/ENuEDDYfvKP> via Rob Pike - 8:02 PM - Public I just heard that, after a long illness, Dennis Ritchie (dmr) died at home this weekend. I have no more information. I trust there are people here who will appreciate the reach of his contributions and mourn his passing appropriately. He was a quiet and mostly private man, but he was also my friend, colleague, and collaborator, and the world has lost a truly great mind. -- Nevin Liber <mailto:nevin@eviloverlord.com> (847) 691-1404

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BGL: labelled edge graph
by Shaun Jackman 12 Oct '11

12 Oct '11

Hi, I have a directed acyclic word graph (DAWG) [1] for which the fundamentally efficient operation takes a vertex descriptor and an edge label and returns an edge descriptor (if that edge exists). An out_edge_iterator can be used to iterate over the edges to find the edge with the specified label, but it's not very efficient. I plan to extend the BGL API to add the needed functionality. I wanted to check first that this function doesn't already exist, and if it doesn't, ask for suggested names. I was thinking of... pair<edge_descriptor, bool> out_edge( vertex_descriptor u, edge_label i, Graph g); The type of edge_label would depend on the graph. For me, it's a char. This sort of labelled edge navigation also applies to a de Bruijn graph [2]. Cheers, Shaun [1] http://en.wikipedia.org/wiki/Directed_acyclic_word_graph [2] http://en.wikipedia.org/wiki/De_Bruijn_graph

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[numeric][interval] clang support patch
by Jürgen Hunold 12 Oct '11

12 Oct '11

Hi, I've been running into the (in-)famous clang bug http://llvm.org/bugs/show_bug.cgi?id=6907 which prevents detail/c99sub_rounding_control.hpp from working. Boost contains workaround code in <boost/detail/fenv.hpp> which is used by the patch attached. Ok to commit? Yours, Jürgen -- Dipl.-Math. Jürgen Hunold | IVE mbH Software-Entwickler | Lützerodestraße 10 Tel: +49 511 897668 33 | 30161 Hannover, Germany Fax: +49 511 897668 29 | http://www.ivembh.de juergen.hunold(a)ivembh.de | | Geschäftsführer: Sitz des Unternehmens: Hannover | Univ.-Prof. Dr.-Ing. Thomas Siefer Amtsgericht Hannover, HRB 56965 | PD Dr.-Ing. Alfons Radtke

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