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std::function

De cppreference.com
< cpp‎ | utility‎ | functional


 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Objetos Function


Envoltorios de función
Original:
Function wrappers
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function
(C++11)
(C++11)
Enlazar
Original:
Bind
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(C++11)
Envolturas de referencia
Original:
Reference wrappers
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(C++11)(C++11)
Envoltorios Operador
Original:
Operator wrappers
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Negadores
Original:
Negators
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Desaprobado aglutinantes y adaptadores
Original:
Deprecated binders and adaptors
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(obsoleto)
(obsoleto)
(obsoleto)
(obsoleto)
(obsoleto)(obsoleto)(obsoleto)(obsoleto)
(obsoleto)
(obsoleto)(obsoleto)
(obsoleto)(obsoleto)
 
std::function
Las funciones miembro
Original:
Member functions
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Terceros funciones
Original:
Non-member functions
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Clases de ayuda
Original:
Helper classes
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Definido en la cabecera <functional>
template< class >
class function; /* undefined */
(desde C++11)
template< class R, class... Args >
class function<R(Args...)>
(desde C++11)
std::function clase de plantilla es un contenedor de uso general función polimórfica. Los casos de std::function puede almacenar, copiar, e invocar cualquier exigible objetivo - funciones, expresiones lambda, expresiones de vinculación u otros objetos de función .
Original:
Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any callable target -- functions, expresiones lambda, expresiones de vinculación, or other function objects.
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Contenido

[editar] Tipos de miembros

Tipo
Original:
Type
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Definition
result_type R
argument_type
T si sizeof...(Args)==1 y T es el primer tipo y sólo en Args...
Original:
T if sizeof...(Args)==1 and T is the first and only type in Args...
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first_argument_type
T1 si sizeof...(Args)==2 T1 y es el primero de los dos tipos en Args...
Original:
T1 if sizeof...(Args)==2 and T1 is the first of the two types in Args...
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second_argument_type
T2 si sizeof...(Args)==2 y T2 es el segundo de los dos tipos en Args...
Original:
T2 if sizeof...(Args)==2 and T2 is the second of the two types in Args...
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[editar] Las funciones miembro

construye una instancia std::function nuevo
Original:
constructs a new std::function instance
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(función miembro público) [editar]
destruye una instancia std::function
Original:
destroys a std::function instance
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(función miembro público) [editar]
asigna el contenido
Original:
assigns the contents
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(función miembro público) [editar]
intercambia los contenidos
Original:
swaps the contents
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(función miembro público) [editar]
asigna un nuevo objetivo
Original:
assigns a new target
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(función miembro público) [editar]
Comprueba si un objetivo válido está contenido
Original:
checks if a valid target is contained
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(función miembro público) [editar]
invoca al destino
Original:
invokes the target
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(función miembro público) [editar]
Objetivo de acceso
Original:
Target access
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obtiene el typeid del objetivo almacenado de un std::function
Original:
obtains the typeid of the stored target of a std::function
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(función miembro público) [editar]
obtiene un puntero a la de destino almacenada de una std::function
Original:
obtains a pointer to the stored target of a std::function
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(función miembro público) [editar]

[editar] Terceros funciones

el algoritmo se especializa std::swap
Original:
specializes the std::swap algorithm
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(plantilla de función) [editar]
compara con una std::function std::nullptr
Original:
compares an std::function with std::nullptr
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(plantilla de función)

[editar] Clases de ayuda

se especializa el rasgo tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(especialización de plantilla de clase) [editar]

[editar] Ejemplo

#include <functional>
#include <iostream>
 
struct Foo {
    Foo(int num) : num_(num) {}
    void print_add(int i) const { std::cout << num_+i << '\n'; }
    int num_;
};
 
void print_num(int i)
{
    std::cout << i << '\n';
}
 
int main()
{
    // store a free function
    std::function<void(int)> f_display = print_num;
    f_display(-9);
 
    // store a lambda
    std::function<void()> f_display_42 = []() { print_num(42); };
    f_display_42();
 
    // store the result of a call to std::bind
    std::function<void()> f_display_31337 = std::bind(print_num, 31337);
    f_display_31337();
 
    // store a call to a member function
    std::function<void(const Foo&, int)> f_add_display = &Foo::print_add;
    Foo foo(314159);
    f_add_display(foo, 1);
}

Salida:

-9
42
31337
314160

[editar] Ver también

la excepción que se produce cuando se invoca una std::function vacía
Original:
the exception thrown when invoking an empty std::function
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(clase) [editar]
(C++11)
crea un objeto de función de un puntero a un miembro
Original:
creates a function object out of a pointer to a member
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(plantilla de función) [editar]