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#ifndef TYPEASVALUE_SRC_FUNCTION_APPLY_H_
#define TYPEASVALUE_SRC_FUNCTION_APPLY_H_
#include <type_traits>
namespace tav {
namespace detail {
struct placeholder_tag { };
template <typename Type>
using is_placeholder = tav::Boolean<
std::is_base_of<placeholder_tag, Type>::value
>;
template <int Index>
struct placeholder : placeholder_tag { };
template <
typename Partials,
typename Argument
>
struct resolve_placeholder {
typedef Argument type;
};
template <
typename Partials,
int Index
>
struct resolve_placeholder<Partials, placeholder<Index>> {
typedef typename Nth<Size<Index>, Partials>::type type;
};
}
typedef detail::placeholder<0> _0;
typedef detail::placeholder<1> _1;
typedef detail::placeholder<2> _2;
typedef detail::placeholder<3> _3;
template <
template<typename...> class Function,
typename... Arguments
>
struct Apply {
typedef typename tav::List<Arguments...>::type argument_list;
template <typename... Partials>
using type = Function<
typename detail::resolve_placeholder<
typename tav::List<Partials...>::type,
Arguments
>::type...
>;
template <typename Partials>
using single_type = type<Partials>;
};
}
#endif // TYPEASVALUE_SRC_FUNCTION_APPLY_H_
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