const_container/include/CompileOptional.h

//
// Created by Patrick Maschek on 22.01.2024.
//

#ifndef CONST_CONTAINER_COMPILEOPTIONAL_H_
#define CONST_CONTAINER_COMPILEOPTIONAL_H_

#include <type_traits>
#include <initializer_list>

namespace cc {
	template<typename T, bool Cond = false>
	class CompileOptional {};
	
	template<typename T>
	class CompileOptional<T, false> {
		public:
			using defined = std::false_type;
			using value_type = T;
			
			constexpr CompileOptional() = default;
			constexpr CompileOptional(const value_type& value) {}
			template<typename ...Args>
			constexpr CompileOptional(Args... args) {}
	};

	template<typename T>
	class CompileOptional<T, true> {
		public:
			using defined = std::true_type;
			using value_type = T;
			
			constexpr CompileOptional() = default;
			constexpr CompileOptional(const value_type& value) : _value(value) {}
			constexpr CompileOptional(value_type&& value) : _value(value) {}
			template<typename ...Args>
			constexpr CompileOptional(Args... args) : _value( { std::forward<Args>(args)... } ) {}
			 
			constexpr operator T&() { return _value; }
		private:
			T _value;
	};
	
}

#endif //CONST_CONTAINER_COMPILEOPTIONAL_H_