元编程学习: integral_constant

用于定义整型常数变量的类，在<type_traits>中广泛应用，最直接的使用是定义了true_type和false_type, 其为对bool类型的特化

#include <iostream>
#include <type_traits>

using namespace std;

int main()
{
    std::cout << "This Demo is that type_traits: integral_constant" << std::endl;

    std::integral_constant<int, 10> int10;
    std::cout << "The Const Value: " << int10.value << std::endl;

    std::integral_constant<unsigned short int, 20> shortInt20;
    std::cout << "The Const Value: " << shortInt20.value << std::endl;

    std::cout << "Bool Integral_constent " << std::endl;
    std::cout << "true : " << true_type::value << std::endl;
    std::cout << "false: " << false_type::value << std::endl;

    return 0;
}

标签：std,constant,cout,编程,integral,include,type,定义
来源： https://blog.csdn.net/hit1524468/article/details/122520382