TConditional.hpp

// stl의 conditional, conditional_type을 현재 사용중인 컨벤션에 맞춰 이름만 수정한 버전임.
#pragma once

// Struct template conditional
// - type is
// - 1. Type_1 for Expression
// - 2. Type_2 for assumed !Expression
template<bool Expression, class Type_1, class Type_2>
struct TConditional
{
	using type = Type_2;
};

// Struct template conditional
// - type is
// - 1. Type_1 for Expression
// - 2. Type_2 for assumed !Expression
template<class Type_1, class Type_2>
struct TConditional<true, Type_1, Type_2>
{
	using type = Type_1;
};

template<bool Expression, class Type_1, class Type_2>
using TConditionalType = typename TConditional<Expression, Type_1, Type_2>::type;