mirror/meta_prog/if.hpp

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#ifndef MIRROR_META_PROG_IF_1011291729_HPP
#define MIRROR_META_PROG_IF_1011291729_HPP


#include <mirror/meta_prog/forward_decl.hpp>

MIRROR_NAMESPACE_BEGIN
namespace mp {

template <class IfTrue, class IfFalse>
struct if_<std::true_type, IfTrue, IfFalse>
{
    typedef IfTrue type;
};

template <class IfTrue, class IfFalse>
struct if_<std::false_type, IfTrue, IfFalse>
{
    typedef IfFalse type;
};

#ifdef MIRROR_DOCUMENTATION_ONLY


template <class BooleanConstant, class IfTrue, class IfFalse>
struct if_
{
    typedef unspecified type;
};
#else
template <typename X, class IfTrue, class IfFalse>
struct if_ : public if_<
    std::integral_constant<bool, X::type::value>,
    IfTrue,
    IfFalse
>
{ };
#endif

#ifdef MIRROR_DOCUMENTATION_ONLY


template <bool BooleanConstant, class IfTrue, class IfFalse>
struct if_c
{
    typedef unspecified type;
};
#else
template <bool Value, class IfTrue, class IfFalse>
struct if_c : public if_<
    std::integral_constant<bool, Value>,
    IfTrue,
    IfFalse
>
{ };
#endif


} // namespace mp
MIRROR_NAMESPACE_END

#endif //include guard