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POWhat is the Preferred Cross-platform 'main' Definition Using boost::program_options?
 

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  1. POWhat is the Preferred Cross-platform 'main' Definition Using boost::program_options?
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    <p>I'm trying to develop a cross-platform application using C++ with boost. </p> <p>I typically program in a *nix environment, where I've always defined 'main' as follows:</p> <pre><code>int main( const int argc, const char* argv[] ) { ... } </code></pre> <p>For this application, I'm starting in the Windows environment, using Visual Studio 2003.</p> <p>When I try to use boost::program_options with this definition, I get compile errors from program_options::store:</p> <pre><code>po::options_description desc("Supported options"); desc.add_options()...; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); </code></pre> <p>Error:</p> <pre><code>main.cpp(46) : error C2665: 'boost::program_options::store' : none of the 2 overloads can convert parameter 1 from type 'boost::program_options::basic_parsed_options&lt;charT&gt;' with [ charT=const char ] c:\boost_1_38_0\boost\program_options\variables_map.hpp(34): could be 'void boost::program_options::store(const boost::program_options::basic_parsed_options&lt;charT&gt; &amp;,boost::program_options::variables_map &amp;,bool)' with [ charT=char ] c:\boost_1_38_0\boost\program_options\variables_map.hpp(43): or 'void boost::program_options::store(const boost::program_options::basic_parsed_options&lt;wchar_t&gt; &amp;,boost::program_options::variables_map &amp;)' while trying to match the argument list '(boost::program_options::basic_parsed_options&lt;charT&gt;, boost::program_options::variables_map)' with [ charT=const char ] </code></pre> <p>I tried to force the wchar_t function by defining main as follows:</p> <pre><code>int main( const int argc, wchar_t* argv[]){ ... } </code></pre> <p>Then it compiles, but I get link errors:</p> <pre><code>main.obj : error LNK2019: unresolved external symbol "void __cdecl boost::program_options::store(class boost::program_options::basic_parsed_options&lt;unsigned short&gt; const &amp;,class boost::program_options::variables_map &amp;)" referenced in function _main main.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::program_options::basic_parsed_options&lt;unsigned short&gt;::basic_parsed_options&lt;unsigned short&gt;(class boost::program_options::basic_parsed_options&lt;char&gt; const &amp;)" referenced in function "public: class boost::program_options::basic_parsed_options&lt;unsigned short&gt; __thiscall boost::program_options::basic_command_line_parser&lt;unsigned short&gt;::run(void)" main.obj : error LNK2019: unresolved external symbol "class std::basic_string&lt;char,struct std::char_traits&lt;char&gt;,class std::allocator&lt;char&gt; &gt; __cdecl boost::program_options::to_internal(class std::basic_string&lt;unsigned short,struct std::char_traits&lt;unsigned short&gt;,class std::allocator&lt;unsigned short&gt; &gt; const &amp;)" referenced in function "class std::vector&lt;class std::basic_string&lt;char,struct std::char_traits&lt;char&gt;,class std::allocator&lt;char&gt; &gt;,class std::allocator&lt;class std::basic_string&lt;char,struct std::char_traits&lt;char&gt;,class std::allocator&lt;char&gt; &gt; &gt; &gt; __cdecl boost::program_options::to_internal&lt;class std::basic_string&lt;unsigned short,struct std::char_traits&lt;unsigned short&gt;,class std::allocator&lt;unsigned short&gt; &gt; &gt;(class std::vector&lt;class std::basic_string&lt;unsigned short,struct std::char_traits&lt;unsigned short&gt;,class std::allocator&lt;unsigned short&gt; &gt;,class std::allocator&lt;class std::basic_string&lt;unsigned short,struct std::char_traits&lt;unsigned short&gt;,class std::allocator&lt;unsigned short&gt; &gt; &gt; &gt; const &amp;)" </code></pre> <p>Finally, if I fall back to the default main definition setup by Visual Studio, it compiles and links:</p> <pre><code>int main( const int argc, _TCHAR* argv[]){ ... } </code></pre> <p>So, that's good for Windows, but will this work when I try to take it to *nix? Do those systems typically define a _TCHAR type? I haven't come across it personally.</p> <p>What is the proper way to define main to work on Windows and *nix, plus work with the boost::program_options library?</p>
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