Namespace
Varianti

std::is_bind_expression

Da cppreference.com.
< cpp‎ | utility‎ | functional

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Funzione oggetti
Funzione wrapper
Original:
Function wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Associare
Original:
Bind
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Wrapper di riferimento
Original:
Reference wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
reference_wrapper(C++11)
ref
cref
(C++11)
(C++11)
Operatore wrapper
Original:
Operator wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Negatori
Original:
Negators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Sconsigliata a leganti e adattatori
Original:
Deprecated binders and adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unary_function(deprecato)
binary_function(deprecato)
ptr_fun(deprecato)
pointer_to_unary_function(deprecato)
pointer_to_binary_function(deprecato)
mem_fun(deprecato)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t
(deprecato)
(deprecato)
(deprecato)
(deprecato)
mem_fun_ref(deprecato)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t
(deprecato)
(deprecato)
(deprecato)
(deprecato)
binder1st
binder2nd
(deprecato)
(deprecato)
bind1st
bind2nd
(deprecato)
(deprecato)
 
Elemento definito nell'header <functional>
template< class T >
struct is_bind_expression;
(dal C++11)
Se T è il tipo di prodotto da una chiamata a std::bind, questo modello offre il membro costante value true uguali. Per qualsiasi altro tipo, è 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.
You can help to correct and verify the translation. Click here for instructions.
Questo modello può essere specializzata per un tipo definito dall'utente, che deve essere trattato da std::bind come se fosse il tipo di una sottoespressione bind: quando un bind generato oggetto funzione viene richiamata, un argomento legato di questo tipo verrà richiamato come una funzione oggetto e sarà data tutti gli argomenti non legati passati al bind generato oggetto.
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.

Indice

Inherited from std::integral_constant

Member constants

value
[statico]
true se T is a function object generated by std::bind, false altrimenti
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.

(pubblico membro statico costante)

Member functions

operator bool
converte l'oggetto in bool, restituisce 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.

(metodo pubblico)

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 bool
type std::integral_constant<bool, value>

[modifica] Esempio

#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

[modifica] Vedi anche

(C++11)
lega uno o più argomenti a un oggetto funzione
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.

(funzione di modello) [modifica]