std::is_same
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <type_traits>
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template< class T, class U > struct is_same; |
(desde C++11) | |
Se
T e nome U mesmo tipo, com as mesmas qualificações const voláteis, fornece o membro constante value igual a true. Caso contrário value é false.Original:
If
T and U name the same type with the same const-volatile qualifications, provides the member constant value equal to true. Otherwise value is false.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Herdado de std::integral_constant
Member constants
value [estática] |
true se T and U is the same type , false contrário Original: true if T and U is the same type , 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
operator bool |
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
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bool
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type
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std::integral_constant<bool, value>
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Possível implementação
template<class T, class U>
struct is_same : std::false_type {};
template<class T>
struct is_same<T, T> : std::true_type {};
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Exemplo
#include <iostream>
#include <type_traits>
#include <cstdint>
int main()
{
std::cout << std::boolalpha;
std::cout << std::is_same<int, int32_t>::value << '\n';
std::cout << std::is_same<int, int64_t>::value << '\n';
std::cout << std::is_same<float, int32_t>::value << '\n';
}
Saída:
true
false
false