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std::ptr_fun

性病：PTR[医]乐趣

Defined in header ​​
template< class Arg, class Result > std::pointer_to_unary_function<Arg,Result> ptr_fun( Result (*f)(Arg) (1)(until C++17)(deprecated since C++11)
template< class Arg1, class Arg2, class Result > std::pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun( Result (*f)(Arg1, Arg2) (2)(until C++17)(deprecated since C++11)

创建函数包装对象%28std::pointer_to_unary_function或std::pointer_to_binary_function%29，从模板参数推断目标类型。

1%29有效呼叫std::pointer_to_unary_function<Arg,Result>(f)...

2%29有效呼叫std::pointer_to_binary_function<Arg1,Arg2,Result>(f)...

这个函数和相关类型在C++11中被取消，而更倾向于更一般的std::function和std::ref，它们都从普通函数创建可调用适配器兼容的函数对象。

参数

f-pointer to a function to create a wrapper for

返回值

函数对象包装f...

例外

%280%29

例

二次

#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::cref(isvowel))
//               std::not1(std::function<bool(char)>(isvowel))
 
}

二次

产出：

二次

Hll, wrld!

二次

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/实用程序/FunctionalPTR[医]乐趣

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