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std::ptr_fun

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
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
Original:
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)
 
template< class Arg, class Result >

std::pointer_to_unary_function<Arg,Result>

    ptr_fun( Result (*f)(Arg) );
(1) (obsoleto)
template< class Arg1, class Arg2, class Result >

std::pointer_to_binary_function<Arg1,Arg2,Result>

    ptr_fun( Result (*f)(Arg1, Arg2) );
(2) (obsoleto)

Creates a function wrapper object (either std::pointer_to_unary_function or std::pointer_to_binary_function), deducing the target type from the template arguments.

1)
Efectivamente llama std::pointer_to_unary_function<Arg,Result>(f) .
Original:
Effectively calls std::pointer_to_unary_function<Arg,Result>(f).
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2)
Efectivamente llama std::pointer_to_binary_function<Arg1,Arg2,Result>(f) .
Original:
Effectively calls std::pointer_to_binary_function<Arg1,Arg2,Result>(f).
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This function and the related types are deprecated as of C++11 in favor of the more general std::function and std::ref, both of which create callable adapter-compatible function objects from plain functions.

Contenido

[editar] Parámetros

f - pointer to a function to create a wrapper for

[editar] Valor de retorno

A function object wrapping f.

[editar] Excepciones

(Ninguno)
Original:
(none)
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[editar] Ejemplo

#include <string>
#include <iostream>
#include <algorithm>
#include <functional>
bool isvowel(char c)
{
    return std::string("aeoiuAEIOU").find(c) != std::string::npos;
}
int main()
{
    std::string s = "Hello, world!";
    std::copy_if(s.begin(), s.end(), std::ostreambuf_iterator<char>(std::cout),
                 std::not1(std::ptr_fun(isvowel)));
// C++11 alternatives: 
//               std::not1(std::ref(isvowel)));
//               std::not1(std::function<bool(char)>(isvowel)));
 
}

Output:

Hll, wrld!