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std::ptr_fun

De cppreference.com
< cpp‎ | utility‎ | functional
 
 
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template< class Arg, class Result >

std::pointer_to_unary_function<Arg,Result>

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

std::pointer_to_binary_function<Arg1,Arg2,Result>

    ptr_fun( Result (*f)(Arg1, Arg2) );
(2) (en desuso)

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).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
2)
Efectivamente llama std::pointer_to_binary_function<Arg1,Arg2,Result>(f) .
Original:
Effectively calls std::pointer_to_binary_function<Arg1,Arg2,Result>(f).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[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)));
 
}

Salida:

Hll, wrld!