std::is_member_function_pointer

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Defined in header <type_traits>
template< class T >
struct is_member_function_pointer;
 （C++11 起）
T是指向非静态成员函数的指针，为会员提供恒定的value等于true。对于任何其他类型，value是false.
Original:
If T is pointer to non-static member function, provides the member constant value equal true. For any other type, value is false.
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目录

Inherited from std::integral_constant

Member constants

value
[静态的] </ SPAN></div></div>
true如果 T is a member function pointer type ，false其他方式
Original:
true if T is a member function pointer type , false otherwise
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（公共静态成员常量）

Member functions

operator bool
转换的对象bool，返回value
Original:
converts the object to bool, returns value
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（公共成员函数）

Member types

类型
Original:
Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

</div>

[编辑] 可能的实现

template< class T >
struct is_member_function_pointer_helper : std::false_type {};
 
template< class T, class U>
struct is_member_function_pointer_helper<T U::*> : std::is_function<T> {};
 
template< class T >
struct is_member_function_pointer : is_member_function_pointer_helper<
                                        typename std::remove_cv<T>::type
                                    > {};

[编辑] 为例

#include <type_traits>
 
class A {
    void member_function() { }
};
 
// fails at compile time if A does not contain member_function as a function.
 
static_assert<std::is_member_function_pointer<decltype(&A::member_function)>::value,
                      "Class does not contain member.");


[编辑] 另请参阅

（C++11）
检查如果一个类型是一个指针类型
Original:
checks if a type is a pointer type
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（类模板） [edit]
（C++11）
检查如果一个类型是一个指针，指向一个非静态成员对象
Original:
checks if a type is a pointer to a non-static member object
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（类模板） [edit]
（C++11）
 checks if a type is a pointer to a non-static member function or object
（类模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/types/is_member_function_pointer&oldid=27412”