std::is_bind_expression
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| Definido no cabeçalho <functional>
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| template< class T > struct is_bind_expression; |
(desde C++11) | |
Se
T é o tipo produzido por uma chamada para std::bind, este modelo fornece o membro constante value true igual. Para qualquer outro tipo, é value false.Original:
If
T is the type produced by a call to std::bind, this template provides the member constant value equal true. For any other type, value is false.The text has been machine-translated via Google Translate.
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Este modelo pode ser especializado para um tipo definido pelo usuário, que deve ser tratada por std::bind como se fosse o tipo de uma subexpressão dilema: quando um objeto função de ligação gerado é chamado, um argumento limite deste tipo será chamado como uma função objeto e será dado todos os argumentos não ligados passados para o objeto de ligação gerado.
Original:
This template may be specialized for a user-defined type which should be treated by std::bind as if it was the type of a bind subexpression: when a bind-generated function object is invoked, a bound argument of this type will be invoked as a function object and will be given all the unbound arguments passed to the bind-generated object.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Índice |
Herdado de std::integral_constant
Member constants
| value [estática] |
true se T is a function object generated by std::bind, false contrário Original: true if T is a function object generated by std::bind, 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> |
[editar] Exemplo
#include <iostream> #include <type_traits> #include <functional> struct MyBind { typedef int result_type; int operator()(int a, int b) const { return a + b; } }; namespace std { template<> struct is_bind_expression<MyBind> : public true_type {}; } int f(int n1, int n2) { return n1+n2; } int main() { // as if bind(f, bind(MyBind::operator(), _1, _2), 2) auto b = std::bind(f, MyBind(), 2); std::cout << "Adding 2 to the sum of 10 and 11 gives " << b(10, 11) << '\n'; }
Saída:
Adding 2 to the sum of 10 and 11 gives 23
[editar] Veja também
| (C++11) |
se liga um ou mais argumentos para um objeto de função Original: binds one or more arguments to a function object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) |
