template<class Ty> struct is_member_object_pointer; 参数 Ty 查询的类型。 备注 该类型特性的实例适合,如果类型 Ty 是指向成员的指针对象或 cv-qualified 指向成员的指针的对象,否则它包含错误。 请注意 is_member_object_pointer 保存错误,如果 Ty 是指向成员函数。 示例 复制 // std_tr1__type_traits_...
template<classTy>structis_member_object_pointer; 参数 Ty 要查询的类型。 注解 如果类型 Ty是指向成员对象的指针或指向成员对象的cv-qualified指针,则类型谓词的实例为 true,否则为 false。 请注意,如果 Ty是指向成员函数的指针,则is_member_object_pointer为 false。
is_member_pointer<trivial *> == false is_member_pointer<int trivial::*> == true is_member_pointer<int (functional::*)()> == true 需求 標頭:<type_traits> 命名空間:std 另請參閱 <type_traits> is_member_function_pointer 類別 is_member_object_pointer 類別 ...
std::is_member_object_pointer<T>::value 或者 std::is_member_object_pointer_v<T> 。其中 T ...
structRecord{inta;intb;};intRecord::*pa=&Record::a;// movQWORD PTR -8[rbp], 0intRecord:...
+ (BOOL)isMemberOfClass:(Class)cls { return self->ISA() == cls; } - (BOOL)isMemberOfClass:(Class)cls { return [self class] == cls; } 同样是类方法和实例方法,类方法返回元类是否等于传入类,实例方法返回当前对象的类是否等于传入类。再来套用题目: re5 = [[NSObject class] isMemberOf...
An instance of the type predicate holds true if the type Ty is a pointer to void, a pointer to an object, or a pointer to a function, or a cv-qualified form of one of them, otherwise it holds false. Note that is_pointer holds false if Ty is a pointer to member or a pointer ...
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_pointer (C++11) checks if a type is a pointer to a non-static member function...
std::is_member_pointer is a UnaryTypeTrait. 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 ...
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) is_array (C++11) checks if a type is an array type (cla...