February 2010 - Boost-users

Property tree custom_data_type.cpp fails to compile in boost 1.42.
by Mauricio Gomes 17 Feb '10

17 Feb '10

The example C:\boost_1_42_0\libs\property_tree\examples\custom_data_type.cpp fails to compile for me. I am using Code::Blocks 8.02 with mingw gcc 4.4.0. I am getting the following error message: ||=== test, Debug ===| C:\projects\test\main2.cpp||In function 'int main()':| C:\projects\test\main2.cpp|59|error: wrong number of template arguments (5, should be 3)| C:\boost_1_42_0\boost\property_tree\ptree_fwd.hpp|29|error: provided for 'template<class Key, class Data, class KeyCompare> class boost::property_tree::basic_ptree'| C:\projects\test\main2.cpp|59|error: invalid type in declaration before ';' token| C:\projects\test\main2.cpp|63|error: request for member 'put' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|64|error: request for member 'get' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|64|error: expected primary-expression before 'int'| C:\projects\test\main2.cpp|64|error: expected ',' or ';' before 'int'| C:\projects\test\main2.cpp|68|error: request for member 'put' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|68|error: expected primary-expression before '>' token| C:\projects\test\main2.cpp|68|warning: left-hand operand of comma has no effect| C:\projects\test\main2.cpp|69|error: request for member 'get' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|69|error: expected primary-expression before '>' token| C:\projects\test\main2.cpp|74|error: request for member 'put' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|74|error: expected primary-expression before '>' token| C:\projects\test\main2.cpp|74|warning: left-hand operand of comma has no effect| C:\projects\test\main2.cpp|75|error: request for member 'get' in 'pt', which is of non-class type 'my_ptree'| C:\projects\test\main2.cpp|75|error: expected primary-expression before '>' token| ||=== Build finished: 15 errors, 2 warnings ===| The problem seems to be the number of template parameters in line 59: // Property_tree with boost::any as data type // Key comparison: std::less<std::string> // Key type: std::string // Path type: path // Data type: boost::any // Translator type: my_translator typedef basic_ptree<std::less<std::string>, std::string, path, boost::any, my_translator> my_ptree; my_ptree pt; Am I missing something ? Thanks for your attention, -- Mauricio Gomes Pensar Digital 55-11-9698-1683 (Brazil - mobile)

2 1

[Boost.Build]: Suppress compiler version in build path
by Roland Bock 17 Feb '10

17 Feb '10

Hi, using the current version of boost.build, compilation results are generated in paths like this: /example/gcc-4.2.4/debug/threading-multi Earlier versions (e.g. at a customer's site) ignore the compiler version, thus /example/gcc/debug/threading-multi Can I tell the current bjam to omit the compiler version in the path? Thanks and regards, Roland

1 0

info about connect method of boost::asio::ip::tcp::iostream
by Conoscenza Silente 17 Feb '10

17 Feb '10

Hi All Right now I started using boost::asio::ip::tcp::iostream class. If I use the constructor of this class with 2 strings stating IP and PORT everything is fine and I can connect to my server. boost::asio::ip::tcp::iostream sockStream("1.2.3.4","5000"); Instead if I use the connect method using the port as int, connection doesn't happen. boost::asio::ip::tcp::iostream sockStream; sockStream.connect ("1.2.3.4", 5000 ); if( sockStream.fail() ){ std::cout << "I am not connected" << std::endl; } What am I doing wrong? It is something allowed to do or should I use other classes like resolver::query + resolver::iterator? Thanks CS

2 2

Re: [Boost-users] [program_options][1.35] validating string value
by michele.caini＠gmail.com 17 Feb '10

17 Feb '10

If you have problem using boost.regex or another regex framework, don't worry about ask for help, please. :) ----- Reply message ----- Da: "Soumen" <soumen78(a)gmail.com> Data: mer, feb 17, 2010 12:21 Oggetto: [Boost-users] [program_options][1.35] validating string value A: <boost-users(a)lists.boost.org> Thanks Andre and Michele - got the way to accomplish it. -- View this message in context: http://old.nabble.com/-program_options--1.35--validating-string-value-tp276… Sent from the Boost - Users mailing list archive at Nabble.com. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

Re: [Boost-users] [program_options][1.35] validating string value
by michele.caini＠gmail.com 17 Feb '10

17 Feb '10

Using regex can help you, maybe? ----- Reply message ----- Da: "Soumen" <soumen78(a)gmail.com> Data: mer, feb 17, 2010 11:40 Oggetto: [Boost-users] [program_options][1.35] validating string value A: <boost-users(a)lists.boost.org> Hi, My option (say, "opt1") can take any of only few possible string type values (say, "value1", "value2", "value3" and "value4"). Is there anyway to specify this such that if any other value, say - "valueXX", is passed to "opt1", it throws an error? If yes, can someone point me to documentation or sample code snippet to show how to do this? Or, explicitly, checking against these possible values is my only option? Regards, ~ Soumen -- View this message in context: http://old.nabble.com/-program_options--1.35--validating-string-value-tp276… Sent from the Boost - Users mailing list archive at Nabble.com. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

3 3

Re: [Boost-users] [program_options][1.35] validating string value
by michele.caini＠gmail.com 17 Feb '10

17 Feb '10

Something like [on¦off¦error] is enough, for that simple case. ;) ----- Reply message ----- Da: "Soumen" <soumen78(a)gmail.com> Data: mer, feb 17, 2010 11:58 Oggetto: [Boost-users] [program_options][1.35] validating string value A: <boost-users(a)lists.boost.org> Using regex can help you, maybe? Say, my switch name is "semantic_check" and possible values are "on" (turns on the checker, issues warning when something fails), "off" and "error" (changes severity of warning to error). Could you cite an example code snippet me how regex may help? Regards, ~ Soumen -- View this message in context: http://old.nabble.com/-program_options--1.35--validating-string-value-tp276… Sent from the Boost - Users mailing list archive at Nabble.com. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

[1.35.0][OSX][iostreams] Exception thrown with utf8 filename
by Christophe Radondy 17 Feb '10

17 Feb '10

Hi, I try to do a cross-platform source code and I have this code. I compiled boost 1.35 in universal binaries on Mac OS 10.5.4 with intel platform (IMAC core 2 duo 3Ghz) The same code works on linux (Ubuntu 8.0.4 and debian) and windows platforms but on Mac OS 10.5 I have an exception in boost's libraries. We compile on universal binaries with -fexceptions options of g++ 4.0.1 (Apple). This is my code: <code> boost::filesystem::wpath unicode(L"abcdef\u0110"); boost::filesystem::ofstream file(unicode.string()); // throws Invalid Argument on Mac file << "abcdef" << endl; file.close(); <endcode/> If I do this, it works: <code> boost::filesystem::path utf8("abcdef\xC4\x90"); // \xC4\x90 == \u0110 boost::filesystem::ofstream file(utf8.string()); // works ok file << "abcdef" << endl; file.close(); <endcode/> When the ofstream is created, this function is executed and crashes when I use Unicode parameters : <code> unicode.external_file_string(); // throws uncaught exception of type boost::filesystem::basic_filesystem_error<boost::filesystem::basic_path<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, boost::filesystem::wpath_traits> > - boost::filesystem::wpath::to_external conversion error: Invalid argument <endcode/> Do you have any idea? Is this a known bug? Did I miss a setting? Thanks for your help. Regards, Christophe.

2 2

error importing hello_ext
by hitesh dhiman 17 Feb '10

17 Feb '10

Hi all, I'm trying to get the boost.python tutorial working. The hello.py example builds successfully. The problem is, when i run my python file, there is an error: Evaluating hello.py Traceback (most recent call last): File "<string>", line 6, in <fragment> ImportError: No module named hello_ext Now, the tutorial directory has the python and c++ file, and a bin directory. the bin directory is as follows : tutorial\bin\msvc-9.0\debug\threading-multi the hello_ext.pyd file is located inside here. Can anyone help? Its a path problem i believe, but i'm not able to pin point whats wrong. -- Regards, Hitesh Dhiman Electrical Engineering National University of Singapore

3 4

Object pools?
by Ryan McConnehey 17 Feb '10

17 Feb '10

I recently had to create a class that managed a pool of objects for the user. Instead of the user creating the object themselves they would ask the class for an object. The class would hand the user a boost::shared_ptr of the object. When the boost::shared_ptr needed to destroy the object it handed it back to the class to reuse. The class is designed for those areas that need a lot of the same object but not all at the same time. This class has been useful for the boost::asio library where the async_receive and async_write need the buffer to be valid until the callback occurs. Other people at my work have shown interest and I'm looking at needing to improve the class to make it more general. Instead of spending time doing the improvements I would like to know if the boost libraries have anything like what I described. I'll looked through the descriptions but haven't seen anything that comes close. Ryan

3 4

Embedding boost in a given project
by joel falcou 17 Feb '10

17 Feb '10

In order to satisfy various users request and to limit potential whining about implicit dependencies on boost, I've started lookign at how to embed boost components into my own tools. What are the usual way to do that ? I pondered working with a given version (say 1.42) in which I could add w/e patches and fixed from the trunk along with my own custom patches. I then use BCP to extract sub boost compoennt to my release package. Now, the final funny thing is that, for various reason, we don't use bjam atm for our own product build. I guess adding a makefile fuel like dependency: bjam --with-xxxx is enough for example ? Any experience to be shared on that topic ? -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

6 6