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#ifndef TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_H_
#define TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_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 <int Index>
struct placeholder : placeholder_tag { };
template <typename Type>
using is_placeholder = Eval<std::is_base_of<placeholder_tag, Type>>;
template <typename... Arguments>
using count_placeholders = Count<is_placeholder, List<Arguments...>>;
template <typename, typename Argument>
struct resolve_placeholder {
typedef Argument type;
};
template <
typename Partials,
int Index
>
struct resolve_placeholder<Partials, placeholder<Index>> {
typedef Nth<Size<Index>, Partials> type;
};
}
}
#endif // TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_H_
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