元编程学习: integral_constant

用于定义整型常数变量的类，在中广泛应用，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 
#include using namespace std;int main()
{std::cout << "This Demo is that type_traits: integral_constant" << std::endl;std::integral_constant int10;std::cout << "The Const Value: " << int10.value << std::endl;std::integral_constant 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;
}