| Defined in header <functional> | ||||
|---|---|---|---|---|
| (1) | (until C++17) (deprecated since C++11) | ||
| (2) | (until C++17) (deprecated since C++11) |
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) Effectively calls std::pointer_to_unary_function<Arg,Result>(f).
2) Effectively calls std::pointer_to_binary_function<Arg1,Arg2,Result>(f).
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.
Parameters
| f | - | pointer to a function to create a wrapper for |
Return value
A function object wrapping f.
Exceptions
(none).
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #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))); } |
Output:
1 | Hll, wrld! |
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