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#ifndef TYPEASVALUE_SRC_FUNCTION_DETAIL_APPLY_H_
#define TYPEASVALUE_SRC_FUNCTION_DETAIL_APPLY_H_
#include <type_traits>
#include "list/list.h"
#include "list/operation/nth.h"
#include "list/operation/higher/query.h"
namespace tav {
namespace detail {
struct placeholder_tag { };
template <typename Type>
using is_placeholder = 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 tav::Nth<Size<Index>, Partials> type;
};
template <typename... Arguments>
using count_placeholders = Count<
is_placeholder,
tav::List<Arguments...>
>;
template <
template<typename...> class Function,
typename... Arguments
>
struct apply_none {
using function = Function<Arguments...>;
};
template <
template<typename...> class Function,
typename... Arguments
>
struct apply_variadic {
template <typename... Partials>
using function = Function<
Eval<resolve_placeholder<
tav::List<Partials...>,
Arguments
>>...
>;
};
template <
template<typename...> class Function,
typename... Arguments
>
struct apply_single : apply_variadic<Function, Arguments...> {
template <typename Partial0>
using function = typename apply_variadic<
Function,
Arguments...
>::template function<Partial0>;
};
template <
template<typename...> class Function,
typename... Arguments
>
struct apply_pair : apply_variadic<Function, Arguments...> {
template <typename Partial0, typename Partial1>
using function = typename apply_variadic<
Function,
Arguments...
>::template function<Partial0, Partial1>;
};
}
}
#endif // TYPEASVALUE_SRC_FUNCTION_DETAIL_APPLY_H_
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