std::is_member_object_pointer - cppreference.com

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Elemento definito nell'header `<type_traits>`

`template< class T > struct is_member_object_pointer;`		(dal C++11)

Se T è puntatore a non statico oggetto membro, fornisce l'elemento costante value true uguali. Per qualsiasi altro tipo, è value false.

Original:

If T is pointer to non-static member object, provides the member constant value equal true. For any other type, value is false.

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Inherited from std::integral_constant

Member constants


	`true` se `T` is a pointer to member object , `false` altrimenti Original: `true` if `T` is a pointer to member object , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (pubblico membro statico costante)

Member functions


	converte l'oggetto in `bool`, restituisce `value` Original: converts the object to `bool`, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)

Member types


Tipo Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`bool`

`type`	`std::integral_constant<bool, value>`

Possibile implementazione

template<class T>
struct is_member_object_pointer : std::integral_constant<
                                      bool,
                                      std::is_member_pointer<T>::value &&
                                      !std::is_member_function_pointer<T>::value
                                  > {};

Esempio

#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';
}

Output:

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

Vedi anche


is_pointer (C++11)	Verifica se un tipo è un tipo di puntatore Original: checks if a type is a pointer type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) [modifica]

is_member_pointer (C++11)	checks if a type is a pointer to a non-static member function or object (classe template) [modifica]

is_member_function_pointer (C++11)	Verifica se un tipo è un puntatore ad una funzione non statica membro Original: checks if a type is a pointer to a non-static member function The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) [modifica]

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