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Yii 2.0

std::is_member_pointer

STD：：是[医]成员[医]指针

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

如果T是指向非静态成员对象的指针，还是指向非静态成员函数的指针，则提供成员常量。value平等true.对于任何其他类型，value是false...

模板参数

T-a type to check

辅助变量模板

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

继承自STD：积分[医]常量

成员常数

value statictrue if T is a member pointer 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]成员[医]指针[医]助手：std：：false[医]类型{}；模板<类T，类U>结构是[医]成员[医]指针[医]助手<T U：：%2A>：STD：：真[医]类型{}；模板<class T>结构是[医]成员[医]指针：是[医]成员[医]指针[医]助手<type Name STD：：Remove[医]CV<T>*类型>{}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
int main() {
    class cls {};
    std::cout << (std::is_member_pointer<int(cls::*)>::value
                     ? "T is member pointer"
                     : "T is not a member pointer") << '\n';
    std::cout << (std::is_member_pointer<int>::value
                     ? "T is member pointer"
                     : "T is not a member pointer") << '\n';
}

二次

产出：

二次

T is member pointer
T is not a member pointer

二次

另见

is_pointer (C++11)checks if a type is a pointer type (class template)
is_member_object_pointer (C++11)checks if a type is a pointer to a non-static member object (class template)
is_member_function_pointer (C++11)checks if a type is a pointer to a non-static member function (class template)

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