Replace multiple pair of characters in string

Question

I want to replace all occurrence of \'a\' with \'b\', and \'c\' with \'d\'.

My current solution is:

std::replace(str.begin(), str.end(), \'a\', \'b\'         


        

Answer 1

If you do not like two passes, you can do it once:

 std::transform(std::begin(s), std::end(s), std::begin(s), [](auto ch) {
    switch (ch) {
    case 'a':
      return 'b';
    case 'c':
      return 'd';
    }
    return ch;
  });