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  1. #include <iostream>
  2. #include <locale>
  3.  
  4. template <typename T>
  5. struct comma_separator : std::numpunct<T>
  6. {
  7.     typename std::numpunct<T>::char_type do_decimal_point() const
  8.     {
  9.         return ',';
  10.     }
  11. };
  12.  
  13. template <typename T>
  14. std::basic_ostream<T>& comma_sep(std::basic_ostream<T>& os)
  15. {
  16.     os.imbue(std::locale(std::locale(""), new comma_separator<T>));
  17.     return os;
  18. }
  19.  
  20. int main()
  21. {
  22.     std::cout << comma_sep << 3.14; // 3,14
  23. }
Success #stdin #stdout 0s 4560KB
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stdin
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Standard input is empty
stdout
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3,14
https://ideone.com/DzQCzD
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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