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std::is_member_object_pointer

STD：：是[医]成员[医]对象[医]指针

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

检查是否T是非静态成员对象。提供成员常量。value等于true，如果T是非静态成员对象类型。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_member_object_pointer_v = is_member_object_pointer::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a pointer to member object , 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]对象[医]指针：std：：整数[医]常数<bool，std：：is[医]成员[医]指针<T>*价值&%21 std：：is[医]成员[医]功能[医]指针<T>*价值>{}；

*。

例

二次

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

二次

产出：

二次

T is member object pointer
T is not a member object pointer

二次

另见

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