std::is_member_object_pointer 用法是std::is_member_object_pointer<T>::value 或者 std::is_member_object_pointer_v<T> 。其中 T 是一个类型。T 是“指向成员对象指针”时上面的表达式值为 true ，否则为 false 。下面的 int A::* 就是一个“指向成员对象指针”。它的值指
is_member_object_pointer<T>::value能提取出来如果是函数指针那就是falseis_member_object_pointer - ...
} else if constexpr (std::is_member_object_pointer_v<std::remove_reference_t<F>>) { if constexpr (std::is_base_of_v<std::remove_reference_t<F>, std::remove_reference_t<T>>) { return std::forward<T>(t).*f; } else { return (*std::forward<T>(t)).*f; } } else { r...
If T is pointer to non-static member object or a pointer to non-static member function, provides the member constant value equal true. For any other type, value is false. If the program adds specializations for std::is_member_pointer or std::is_member_pointer_v, the behavior is undefin...
std::is_literal_type std::is_lvalue_reference std::is_member_function_pointer std::is_member_object_pointer std::is_member_pointer std::is_move_assignable std::is_move_constructible std::is_nothrow_assignable std::is_nothrow_constructible std::is_nothrow_copy_assignable std::is_nothrow_copy...
std::is_fundamental std::is_integral std::is_invocable std::is_invocable_r std::is_literal_type std::is_lvalue_reference std::is_member_function_pointer std::is_member_object_pointer std::is_member_pointer std::is_move_assignable std::is_move_constructible std::is_nothrow_assignable std...
以下是在C++中演示std::is_member_function_pointer的程序: 程序1: // C ++程序说明// std::is_member_function_pointer#include<bits/stdc++.h>#include<type_traits>usingnamespacestd;//声明一个结构体classGFG{public:intgfg;};classA{};//主要代码intmain(){//对象分类GFGintGFG::*pt=&GFG::gfg;...
Member constants value [static] true if T is a member function pointer type, false otherwise (public static member constant) Member functions operator bool converts the object to bool, returns value (public member function) operator() (C++14) returns value (public member function) Mem...
std::is_literal_type std::is_lvalue_reference std::is_member_function_pointer std::is_member_object_pointer std::is_member_pointer std::is_move_assignable std::is_move_constructible std::is_nothrow_assignable std::is_nothrow_constructible std::is_nothrow_copy_assignable std::is_nothrow_copy...
std::is_pointer 定义于头文件<type_traits> template<classT> structis_pointer; (C++11 起) 检查T是否为指向对象指针或指向函数指针(但不是指向成员/成员函数指针)。若T是对象/函数指针类型,则提供等于true的成员常量value。否则,value等于false。 添加is_pointer或is_pointer_v(C++17 起)的特化的程序行为未...