std::is_void - cppreference.com

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Definido no cabeçalho `<type_traits>`

`template< class T > struct is_void;`		(desde C++11)

Se T é o tipo void, const void, volatile void, const volatile void ou, fornece o membro constante value true igual. Para qualquer outro tipo, é value false.

Original:

If T is the type void, const void, volatile void, or const volatile void, provides the member constant value equal true. For any other type, value is false.

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Herdado de std::integral_constant

Member constants


	`true` se `T` is the type `void` (possibly cv-qualified) , `false` contrário Original: `true` if `T` is the type `void` (possibly cv-qualified) , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante)

Member functions


	converte o objeto em `bool`, retorna `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. (função pública membro)

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>`

Possível implementação

template< class T >
struct is_void : std::integral_constant<
                     bool,
                     std::is_same<void, typename std::remove_cv<T>::type>::value
                  > {};

Exemplo

#include <iostream>
#include <type_traits>

int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_void<void>::value << '\n';
    std::cout << std::is_void<int>::value << '\n';
}

Saída:

Veja também


is_array (C++11)	verifica se o tipo é um tipo de matriz Original: checks if a type is an array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_pointer (C++11)	verifica se um tipo é um tipo de ponteiro 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. (modelo de classe) [edit]

is_enum (C++11)	verifica se o tipo é um tipo de enumeração Original: checks if a type is an enumeration type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_union (C++11)	verifica se o tipo é um tipo de união Original: checks if a type is an union type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_class (C++11)	checks if a type is a class type (but not union type) (modelo de classe) [edit]

is_function (C++11)	verifica se um tipo é um tipo de função Original: checks if a type is a function type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_object (C++11)	verifica se um tipo é tipo de objeto Original: checks if a type is object type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]