Espaços nominais
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Acções

std::is_enum

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C++
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
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Utilidades do programa
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(C++11)
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Os operadores relacionais
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
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Swap, forward and move
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Apoio a tipos
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Tipos fundamentais
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Numeric limits
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C numérico limita interface
Informações de tipo de tempo de execução
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Runtime type information
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Características de tipo
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Type traits
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Principais categorias de tipo
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Primary type categories
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(C++11)
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is_enum
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
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Propriedades de tipo
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Type properties
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Operações apoiadas
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Supported operations
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Relacionamentos e consultas de propriedade
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Relationships and property queries
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Tipo modificações
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Transformações tipo
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Type transformations
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Digite constantes traço
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Type trait constants
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Definido no cabeçalho <type_traits>
template< class T >
struct is_enum;
 (desde C++11)
Se T é um tipo de enumeração, fornece o membro constante value true igual. Para qualquer outro tipo, é value false.
Original:
If T is an enumeration type, provides the member constant value equal true. For any other type, value is false.
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Índice

Herdado de std::integral_constant

Member constants

value
[estática]
true se T is an enumeration type , false contrário
Original:
true if T is an enumeration type , false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
Original:
converts the object to bool, returns value
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(função pública membro)

Member types

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

[editar] Exemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
enum E {};
 
enum class Ec : int {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_enum<A>::value << '\n';
    std::cout << std::is_enum<E>::value << '\n';
    std::cout << std::is_enum<Ec>::value << '\n';
    std::cout << std::is_enum<int>::value << '\n';
}

Saída: 

false
true
true
false

[editar] Veja também

(C++11)
verifica se um tipo é void
Original:
checks if a type is void
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(modelo de classe) [edit]
(C++11)
verifica se um tipo é um tipo de ponteiro
Original:
checks if a type is a pointer type
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(modelo de classe) [edit]
(C++11)
verifica se um tipo é o tipo de aritmética
Original:
checks if a type is arithmetic type
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(modelo de classe) [edit]
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