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std::is_bind_expression

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Defined in header <functional>
template< class T >
struct is_bind_expression;
(seit C++11)
Wenn T die Art durch einen Aufruf std::bind produziert wird, bietet diese Vorlage das Mitglied konstanten value gleich true. Für jede andere Art, value ist 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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Diese Vorlage kann für einen benutzerdefinierten Typ, der durch std::bind behandelt werden, als ob es die Art eines bind Teilausdruck war spezialisiert werden: wenn ein bind-generierten Funktions-Objekt aufgerufen wird, ein gebundenes Argument dieser Art wird als Funktion aufgerufen werden Objekt und werden alle ungebundenen übergebenen Argumente der bind-generierte Objekt gegeben werden .
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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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
true wenn T is a function object generated by std::bind, false anders
Original:
true if T is a function object generated by std::bind, false otherwise
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(public static Mitglied konstanten)

Member functions

operator bool
wandelt das Objekt bool, gibt value
Original:
converts the object to bool, returns value
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(öffentliche Elementfunktion)

Member types

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

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

(C++11)
bindet ein oder mehrere Argumente an eine Funktion Objekt
Original:
binds one or more arguments to a function object
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(Funktions-Template) [edit]