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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.     struct foo
  5.     {
  6.     	std::string &str;
  7.     	foo(std::string &other) : str(other) {}
  8.  
  9.     	void operator()(std::string &some) const
  10.     	{
  11.     		str += some;
  12.     	}
  13.     };
  14.  
  15.     int main()
  16.     {
  17.     	std::string ext("Hello");
  18.     	foo a{ ext };
  19.  
  20.         std::string more(" world!");
  21.     	a(more);
  22.  
  23.         cout << a.str;
  24.     	return 0;
  25.     }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Hello world!
https://ideone.com/eyLe9A
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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