std::ptr_fun – cppreference.com

std::ptr_fun

Aus cppreference.com

<metanoindex/>

 
C++
 
Utilities-Bibliothek
 
Function-Objekte
Funktionswrapper
function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Bindung
bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Referenzwrapper
reference_wrapper(C++11)
ref
cref		(C++11)
(C++11)
Operatorwrapper
Verneinung
Veraltete Binder und Adapter
unary_function(veraltet)
binary_function(veraltet)
ptr_fun(veraltet)
pointer_to_unary_function(veraltet)
pointer_to_binary_function(veraltet)
mem_fun(veraltet)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t		(veraltet)
(veraltet)
(veraltet)
(veraltet)
mem_fun_ref(veraltet)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t		(veraltet)
(veraltet)
(veraltet)
(veraltet)
binder1st
binder2nd		(veraltet)
(veraltet)
bind1st
bind2nd		(veraltet)
(veraltet)
 
<tbody> </tbody>
template< class Arg, class Result > std::pointer_to_unary_function<Arg,Result> ptr_fun( Result (*f)(Arg) );
 (1) (veraltet)
template< class Arg1, class Arg2, class Result > std::pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun( Result (*f)(Arg1, Arg2) );
 (2) (veraltet)

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)

Effektiv nennt 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)

Effektiv nennt 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.

Parameter

Rückgabewert

A function object wrapping f.

Ausnahmen

(None)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Beispiel

#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!