Function toLowerInPlace

Bcore/src/main/cpp/Dobby/tests/catch.hpp:9517–9519

  return static_cast<char>(std::tolower(c));
}
void toLowerInPlace(std::string &s) {
  std::transform(s.begin(), s.end(), s.begin(), toLowerCh);
}
std::string toLower(std::string const &s) {
  std::string lc = s;
  toLowerInPlace(lc);