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std::is_integral

STD：：是[医]积分

Defined in header ​​
template< class T > struct is_integral;​(since C++11)

检查是否T是一个整体类型。提供成员常量。value等于true，如果T类型bool，，，char，，，char16_t，，，char32_t，，，wchar_t，，，short，，，int，，，long，，，long long，或任何实现定义的扩展整数类型，包括任何有符号、无符号和cv限定的变体。否则，value等于false...

模板参数

T-a type to check

辅助变量模板

template< class T > inline constexpr bool is_integral_v = is_integral::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is an integral type , false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

例

二次

#include <iostream>
#include <type_traits>
 
class A {};
 
template <class T>
T f(T i)
{
    static_assert(std::is_integral<T>::value, "Integer required."
    return i;
}
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_integral<A>::value << '\n';
    std::cout << std::is_integral<float>::value << '\n';
    std::cout << std::is_integral<int>::value << '\n';
    std::cout << f(123) << '\n';
}

二次

产出：

二次

false
false
true
123

二次

另见

is_integer staticidentifies integer types (public static member constant of std::numeric_limits)
is_floating_point (C++11)checks if a type is floating-point type (class template)
is_arithmetic (C++11)checks if a type is arithmetic type (class template)

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