std::ptr_fun
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<tbody> </tbody> template< class Arg, class Result > std::pointer_to_unary_function<Arg,Result> ptr_fun( Result (*f)(Arg) ); |
(1) | (deprecato) |
template< class Arg1, class Arg2, class Result > std::pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun( Result (*f)(Arg1, Arg2) ); |
(2) | (deprecato) |
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)
std::pointer_to_unary_function<Arg,Result>(f).std::pointer_to_unary_function<Arg,Result>(f).You can help to correct and verify the translation. Click here for instructions.
2)
std::pointer_to_binary_function<Arg1,Arg2,Result>(f).std::pointer_to_binary_function<Arg1,Arg2,Result>(f).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.
Parametri
| f | - | pointer to a function to create a wrapper for |
Valore di ritorno
A function object wrapping f.
Eccezioni
You can help to correct and verify the translation. Click here for instructions.
Esempio
#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!