Method toLower

visage_utils/string_utils.cpp:92–97

  }

  String String::toLower() const {
    std::u32string result = string_;
    auto to_lower = [](char32_t c) { return (c >= U'A' && c <= U'Z') ? c + 32 : c; };
    std::transform(result.begin(), result.end(), result.begin(), to_lower);
    return result;
  }

  String String::toUpper() const {
    std::u32string result = string_;