std::is_member_pointer
Defined in header <type_traits> | | |
|---|---|---|
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<T>::value; | | (since C++17) |
|---|
继承自STD：积分[医]常量
成员常数
value static | true if T is a member pointer type , false otherwise (public static member constant) |
|---|
成员函数
operator bool | converts the object to bool, returns value (public member function) |
|---|---|
operator() (C++14) | returns value (public member function) |
成员类型
Type | Definition |
|---|---|
value_type | bool |
type | std::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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