August 2010 - Boost - lists.boost.org

[shared_ptr] Detect shared_ptr argument at compile time
by Ralf Globisch 13 Aug '10

13 Aug '10

Hi, I'm not sure if this is the correct mailing list for this question: Is there a way to determine if a template parameters is of type boost::shared_ptr at compile time? I would like to do something like: template<class A> void doSomething( const A& a) { // if "a" is of type boost::shared_ptr<SomeType> a->someMethod(); // else a.someMethod(); } Is this possible at all? Regards, Ralf

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Re: [boost] Problem with program_options on FreeBSD 8 (gcc 4.2)
by elekktretterr＠exemail.com.au 13 Aug '10

13 Aug '10

> Hi Petr, > > My mistake, I, somehow, thought to read that you wanted the static > libraries. Looking at your cmake-code, I would say it appears correct > for finding the static libraries. Did you check whether you really > have those static libraries? Second, are you on windows and could the > auto-linking be in the way? Third, you may need to specify > BOOST_ALL_DYN_LINK as a compile-definition. > Thanks Andre, Im using FBSD 8. -r--r--r-- 1 root wheel 964726 Jul 23 10:22 /usr/local/lib/libboost_program_options.a lrwxr-xr-x 1 root wheel 29 Jul 23 10:23 /usr/local/lib/libboost_program_options.so -> libboost_program_options.so.4 -r--r--r-- 1 root wheel 472959 Jul 23 10:23 /usr/local/lib/libboost_program_options.so.4 I suppose this means that I have both static and dynamic versions of boost. I'll try BOOST_ALL_DYN_LINK next. Petr

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SVN Trac - can't login :-(
by Paul A. Bristow 13 Aug '10

13 Aug '10

Oops. Trac detected an internal error: OperationalError: database is locked There was an internal error in Trac. It is recommended that you notify your local Trac administrator with the information needed to reproduce the issue. To that end, you could ==== How to Reproduce ==== While doing a GET operation on `/login`, Trac issued an internal error. ''(please provide additional details here)'' Request parameters: {{{ {} }}} User agent: `Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 ( .NET CLR 3.5.30729; .NET4.0C)` ==== System Information ==== ''System information not available'' ==== Enabled Plugins ==== ''Plugin information not available'' ==== Python Traceback ==== {{{ Traceback (most recent call last): File "build/bdist.linux-i686/egg/trac/web/main.py", line 513, in _dispatch_request dispatcher.dispatch(req) File "build/bdist.linux-i686/egg/trac/web/main.py", line 235, in dispatch resp = chosen_handler.process_request(req) File "build/bdist.linux-i686/egg/trac/web/auth.py", line 115, in process_request self._do_login(req) File "build/bdist.linux-i686/egg/trac/web/auth.py", line 153, in _do_login @self.env.with_transaction() File "build/bdist.linux-i686/egg/trac/db/api.py", line 77, in transaction_wrapper fn(ldb) File "build/bdist.linux-i686/egg/trac/web/auth.py", line 159, in store_session_cookie int(time.time()))) File "build/bdist.linux-i686/egg/trac/db/util.py", line 65, in execute return self.cursor.execute(sql_escape_percent(sql), args) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 78, in execute result = PyFormatCursor.execute(self, *args) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 56, in execute args or []) File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 48, in _rollback_on_error return function(self, *args, **kwargs) OperationalError: database is locked The action that triggered the error was: GET: /login (Got same error yesterday.) (But can view tickets OK) --- Paul A. Bristow Prizet Farmhouse Kendal, UK LA8 8AB +44 1539 561830, mobile +44 7714330204 pbristow(a)hetp.u-net.com

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Re: [boost] Problem with program_options on FreeBSD 8 (gcc 4.2)
by elekktretterr＠exemail.com.au 13 Aug '10

13 Aug '10

> Petr, > > Specify that you want to "find" the static boost libs in your > cmakelists.txt, just before calling find_package( Boost ) > > set( Boost_USE_STATIC_LIBS On ) > find_package( Boost REQUIRED COMPONENTS program_options ) > Hi Andre, Thanks, but that is exactly my problem. I want dynamic linking, but it keeps getting linked statically. Ive got this: find_package( Boost 1.43.0 COMPONENTS program_options) set(Boost_USE_STATIC_LIBS OFF) set(Boost_USE_MULTITHREADED ON) if(Boost_FOUND) include_directories(${Boost_INCLUDE_DIRS}) add_executable(...) target_link_libraries(tbone ${Boost_LIBRARIES}) endif()

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[concept] forward declarations and `BOOST_CONCEPT_REQUIRES()`
by Lorenzo Caminiti 13 Aug '10

13 Aug '10

Hello all, Can I forward declare a function template that checks concepts using `BOOST_CONCEPT_REQUIRES()`? In the following example, MSVC gives me an ambiguous call error when I try to do that... (I have not yet tried other compilers). Example "c00.cpp": #include <boost/concept/requires.hpp> #include <boost/concept_check.hpp> #include <vector> // (1) Forward declaration with concepts. template<class Iter, class T> BOOST_CONCEPT_REQUIRES( ((boost::ForwardIterator<Iter>)) ((boost::EqualityComparable<T>)) , (bool) ) all_equals(Iter first, Iter last, const T& val); // (2) Actual definition. template<class Iter, class T> BOOST_CONCEPT_REQUIRES( ((boost::ForwardIterator<Iter>)) ((boost::EqualityComparable<T>)) , (bool) ) all_equals(Iter first, Iter last, const T& val) { for (Iter i = first; i < last; ++i) { if (*i != val) return false; } return true; } int main() { std::vector<double> v; // MSVC error: Cannot resolved ambiguous call between (1) and (2). all_equals(v.begin(), v.end(), double()); return 0; } MSVC error: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. c00.cpp c00.cpp(28) : error C2668: 'all_equals' : ambiguous call to overloaded function c00.cpp(18): could be 'bool all_equals<std::_Vector_iterator<_Ty,_Alloc>,double>(Iter,Iter,const T &)' with [ _Ty=double, _Alloc=std::allocator<double>, Iter=std::_Vector_iterator<double,std::allocator<double>>, T=double ] c00.cpp(11): or 'bool all_equals<std::_Vector_iterator<_Ty,_Alloc>,double>(Iter,Iter,const T &)' with [ _Ty=double, _Alloc=std::allocator<double>, Iter=std::_Vector_iterator<double,std::allocator<double>>, T=double ] while trying to match the argument list '(std::_Vector_iterator<_Ty,_Alloc>, std::_Vector_iterator<_Ty,_Alloc>, double)' with [ _Ty=double, _Alloc=std::allocator<double> ] Thank you very much. -- Lorenzo

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Re: [boost] Problem with program_options on FreeBSD 8 (gcc 4.2)
by elekktretterr＠exemail.com.au 13 Aug '10

13 Aug '10

Oh, I see. My problem was actually not specifing -lboost_program_options on the command line which gave linker error. I'm using cmake now, and it seems that program_options get statically linked. How can I get it to dynamic link instead? I know this is more of a cmake question, so sorry. Thanks, Petr

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[fusion] Variadic template support
by Ravi 12 Aug '10

12 Aug '10

Hi, What is the plan for merging variadic template support from the GSOC project into the release branch? It is already immensely useful. Regards, Ravi

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Problem with program_options on FreeBSD 8 (gcc 4.2)
by elekktretterr＠exemail.com.au 12 Aug '10

12 Aug '10

Hi, I'm new to Boost and I've decided to use it in my C++ project. My first attempt is to use boost::program_options. However, Im hitting a slag and I can't figure out whats the problem. ive got this: #include "boost/program_options.hpp" int main() { return 0; } then I run: g++ -I/usr/local/include -L/usr/local/lib test.cpp but I get this error that doesn't make any sense to me: In file included from /usr/local/include/boost/program_options/value_semantic.hpp:14, from /usr/local/include/boost/program_options/options_description.hpp:13, from /usr/local/include/boost/program_options.hpp:15, from test.cpp:1: /usr/local/include/boost/type_traits/is_unsigned.hpp: In instantiation of 'boost::detail::is_ununsigned_helper<short int>': /usr/local/include/boost/type_traits/is_unsigned.hpp:73: instantiated from 'boost::detail::is_unsigned_imp<short int>' /usr/local/include/boost/type_traits/is_unsigned.hpp:123: instantiated from 'boost::is_unsigned<short int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:110: instantiated from 'boost::detail::make_unsigned_imp<short int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:130: instantiated from 'boost::make_unsigned<short int>' /usr/local/include/boost/lexical_cast.hpp:846: instantiated from here /usr/local/include/boost/type_traits/is_unsigned.hpp:40: warning: comparison between 'enum boost::detail::is_unsigned_values<short int>::<anonymous>' and 'enum boost::detail::is_unsigned_values<short int>::<anonymous>' /usr/local/include/boost/type_traits/is_unsigned.hpp: In instantiation of 'boost::detail::is_ununsigned_helper<int>': /usr/local/include/boost/type_traits/is_unsigned.hpp:73: instantiated from 'boost::detail::is_unsigned_imp<int>' /usr/local/include/boost/type_traits/is_unsigned.hpp:123: instantiated from 'boost::is_unsigned<int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:110: instantiated from 'boost::detail::make_unsigned_imp<int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:130: instantiated from 'boost::make_unsigned<int>' /usr/local/include/boost/lexical_cast.hpp:860: instantiated from here /usr/local/include/boost/type_traits/is_unsigned.hpp:40: warning: comparison between 'enum boost::detail::is_unsigned_values<int>::<anonymous>' and 'enum boost::detail::is_unsigned_values<int>::<anonymous>' /usr/local/include/boost/type_traits/is_unsigned.hpp: In instantiation of 'boost::detail::is_ununsigned_helper<long int>': /usr/local/include/boost/type_traits/is_unsigned.hpp:73: instantiated from 'boost::detail::is_unsigned_imp<long int>' /usr/local/include/boost/type_traits/is_unsigned.hpp:123: instantiated from 'boost::is_unsigned<long int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:110: instantiated from 'boost::detail::make_unsigned_imp<long int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:130: instantiated from 'boost::make_unsigned<long int>' /usr/local/include/boost/lexical_cast.hpp:874: instantiated from here /usr/local/include/boost/type_traits/is_unsigned.hpp:40: warning: comparison between 'enum boost::detail::is_unsigned_values<long int>::<anonymous>' and 'enum boost::detail::is_unsigned_values<long int>::<anonymous>' /usr/local/include/boost/type_traits/is_unsigned.hpp: In instantiation of 'boost::detail::is_ununsigned_helper<long long int>': /usr/local/include/boost/type_traits/is_unsigned.hpp:73: instantiated from 'boost::detail::is_unsigned_imp<long long int>' /usr/local/include/boost/type_traits/is_unsigned.hpp:123: instantiated from 'boost::is_unsigned<long long int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:110: instantiated from 'boost::detail::make_unsigned_imp<long long int>' /usr/local/include/boost/type_traits/make_unsigned.hpp:130: instantiated from 'boost::make_unsigned<long long int>' /usr/local/include/boost/lexical_cast.hpp:889: instantiated from here /usr/local/include/boost/type_traits/is_unsigned.hpp:40: warning: comparison between 'enum boost::detail::is_unsigned_values<long long int>::<anonymous>' and 'enum boost::detail::is_unsigned_values<long long int>::<anonymous>' I tried including other libraries like foreach and thread and they compile & link fine. Can someone please help me? Thanks, Petr

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[1.44] Beta 1 available
by Beman Dawes 12 Aug '10

12 Aug '10

Boost release 1.43.0 beta 1 is now available from SourceForge See http://sourceforge.net/projects/boost/files/ There are two new libraries (Meta State Machine and Polygon) in this release, and lots of fixes and improvements to existing libraries. For details of what's in the release, see http://beta.boost.org/users/news/version_1_44_0. Note that the links to files on this web page are for the final release - use the SourceForge link above to get the beta files. Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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[boostcon] Where is the viterbi library from boostcon 2009?
by Ravi 11 Aug '10

11 Aug '10

Hello, Does anyone have a copy of the Viterbi (dynamic programming) library from boostcon 2009? My google-fu is insufficient to locate it. An email to the author's email address from the boostcon presentation failed to elicit any response. In case anyone is wondering which talk from boostcon prompted my request, here is a link: http://www.mefeedia.com/watch/32045638 Ravi

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