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  1. #include <iostream>
  2. #include <string>
  3. int main() {
  4. 	struct
  5.     {
  6.       bool first = true;
  7.       [[nodiscard]] auto to_string() -> std::string
  8.       {
  9.         if (first)
  10.         {
  11.           first = false;
  12.           return "";
  13.         }
  14.         else
  15.         {
  16.           return ", ";
  17.         }
  18.       }
  19.     } separator;
  20. 	std::cout << separator.to_string() + "a" + separator.to_string() + "b" + separator.to_string() + "c" << '\n';
  21. }
Success #stdin #stdout 0s 4704KB
comments (?)
stdin
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Standard input is empty
stdout
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, a, bc
https://ideone.com/z8nPKF
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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