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std::function::operator()

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< cpp‎ | utility‎ | functional‎ | function

 
 
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
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares y tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Objetos Function
Envoltorios de función
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Function wrappers
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function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Enlazar
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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)
Envolturas de referencia
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Reference wrappers
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reference_wrapper(C++11)
ref
cref
(C++11)
(C++11)
Envoltorios Operador
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Operator wrappers
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Negadores
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Negators
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Desaprobado aglutinantes y adaptadores
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Deprecated binders and adaptors
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unary_function(obsoleto)
binary_function(obsoleto)
ptr_fun(obsoleto)
pointer_to_unary_function(obsoleto)
pointer_to_binary_function(obsoleto)
mem_fun(obsoleto)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t
(obsoleto)
(obsoleto)
(obsoleto)
(obsoleto)
mem_fun_ref(obsoleto)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t
(obsoleto)
(obsoleto)
(obsoleto)
(obsoleto)
binder1st
binder2nd
(obsoleto)
(obsoleto)
bind1st
bind2nd
(obsoleto)
(obsoleto)
 
std::function
Las funciones miembro
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Member functions
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function::function
function::~function
function::operator=
function::swap
function::assign
function::operator bool
function::operator()
function::target_type
function::target
Terceros funciones
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Non-member functions
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operator==
operator!=
std::swap(std::function)
Clases de ayuda
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Helper classes
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std::uses_allocator<std::function>
 
R operator()( ArgTypes... args ) const;
(desde C++11)

Calls the stored callable function target with the parameters args.

Contenido

[editar] Parámetros

args - parameters to pass to the stored callable function target

[editar] Valor de retorno

None if R is void. Otherwise the return value of the invocation of the stored callable object.

[editar] Excepciones

[editar] Ejemplo

The following example shows how std::function can passed to other functions by value. Also, it shown how std::function can store lambdas.

#include <iostream>
#include <functional>
 
void call(std::function<int()> f)  // can be passed by value
{ 
    std::cout << f() << '\n';
}
 
int normal_function() 
{
    return 42;
}
 
int main()
{
    int n = 1;
    std::function<int()> f = [&n](){ return n; };
    call(f);
 
    n = 2;
    call(f); 
 
    f = normal_function; 
    call(f);
}

Output:

1
2
42

[editar] Ver también