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std::is_floating_point

STD：：是[医]浮[医]点

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

检查是否T是浮点类型。提供成员常量。value等于true，如果T类型float，，，double，，，long double，包括任何符合cv条件的变体。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_floating_point_v = is_floating_point::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a floating-point 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>

可能的实施

模板<class T>结构是[医]浮[医]要点：STD：：整数[医]常数<bool，std：：is[医]同<Float，type Name std：：Remove[医]CV<T>*类型>：：价值STD：：是[医]同<Double，type Name std：：Remove[医]CV<T>*类型>：：价值STD：：是[医]同<Long Double，type Name STD：：Remove[医]CV<T>*类型>：：Value>{}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_floating_point<A>::value << '\n';
    std::cout << std::is_floating_point<float>::value << '\n';
    std::cout << std::is_floating_point<int>::value << '\n';
}

二次

产出：

二次

false
true
false

二次

另见

is_iec559 staticidentifies the IEC 559/IEEE 754 floating-point types (public static member constant of std::numeric_limits)
is_integral (C++11)checks if a type is integral type (class template)
is_arithmetic (C++11)checks if a type is arithmetic type (class template)

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