extract_optional_type.hpp File Reference

#include <boost/config.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/mpl/has_xxx.hpp>

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Macros
#define	BOOST_RANGE_EXTRACT_OPTIONAL_TYPE(a_typedef)

Macro Definition Documentation

#define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE

(

a_typedef

)

Value:

BOOST_MPL_HAS_XXX_TRAIT_DEF(a_typedef)                                      \
    template< typename  C, bool B = BOOST_PP_CAT(has_, a_typedef)<C>::value >   \
    struct BOOST_PP_CAT(extract_, a_typedef)                                    \
    {};                                                                         \
    template< typename C >                                                      \
    struct BOOST_PP_CAT(extract_, a_typedef)< C, true >                         \
    {                                                                           \
        typedef BOOST_DEDUCED_TYPENAME C::a_typedef type;                       \
    };

Definition at line 26 of file extract_optional_type.hpp.