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std::is_bind_expression

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Ligar
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Bind
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bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
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Negators
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Obsoleta ligantes e adaptadores
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Deprecated binders and adaptors
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Defined in header <functional>
template< class T >
struct is_bind_expression;
(a partir do 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.
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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.
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Índice

Inherited from 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
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(membro estático público constante)

Member functions

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

Member types

Tipo
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Type
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Definition
value_type bool
type 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';
}

Output:

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
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(modelo de função) [edit]