On Wed, Apr 23, 2008 at 05:06:58AM +0000, Ryan Gallagher wrote:
Jeffery Cavallaro
writes: [...] For example, if I wanted to a program to spit out all of its options to standard out, there doesn't seem to be any hooks to extract an Any value in a generic way (e.g., as a string).
Okay, this isn't exactly generic and only addresses this specific case for the issue that you brought up, but for program_options where you normally just have a limited number of types I've used:
I've done something similar as well. If you have a lot of types, and you want support for vectors of those types, you may want to look at the boost preprocessor macro library: ... #define TYPE_LIST ( unsigned char, ( unsigned short, ( unsigned int, ( unsigned long, ( signed char, ( signed short, ( signed int, ( signed long, ( bool, ( char, ( std::string, BOOST_PP_NIL))))))))))) #define MAKE_VECTOR_LIST( d, data, elem ) std::vector<elem> #define VECTOR_LIST BOOST_PP_LIST_TRANSFORM( MAKE_VECTOR_LIST, _, TYPE_LIST ) #define CAST_SIMPLE( r, data, elem ) if ( ti == typeid( elem ) ) { elem e = anyValue->as<elem>(); return boost::lexical_cast<string>( e ); } #define CAST_VECTOR( r, data, elem ) if ( ti == typeid( elem ) ) { /* iterate through the vector... */ } BOOST_PP_LIST_FOR_EACH(CAST_SIMPLE, _, TYPE_LIST); BOOST_PP_LIST_FOR_EACH(CAST_VECTOR, _, VECTOR_LIST); ... Andrew.