Types.md

To string

template<typename Char = char>
auto to_string();                           //1

template<typename Char = char, typename Arg>
auto to_string(Arg&& arg);                  //2

template<typename Char = char, typename Arg, typename... Args>
auto to_string(Arg&& arg, Args&& ...args);  //3

• 2-3 Convert arguments to std::basic_string<Char> and concatenate them (if multiple arguments are supplied), if
  • if arg has an overload of std::to_string()
  • otherwise, call std::basic_ostream<Char>& operator<<, where the left-hand side is std::basic_stringstream. Then return the string recorded in the string stream.

To number

template<typename NumberType>
auto to_num(const char* str);                                       //1

template<typename NumberType>
auto to_num(const char* str, char** str_end, int base = 10);        //2

template<typename NumberType>
auto to_num(const wchar_t* str, wchar_t** str_end, int base = 10);  //3

template<typename NumberType, typename Char = char, typename = std::enable_if_t<std::is_same_v<Char, char> || std::is_same_v<Char, wchar_t>>>
auto to_num(const std::basic_string<Char>& str, std::size_t* pos = nullptr, int base = 10);//4

• 1 According to NumberType, the function calls
  • std::atoi
  • std::atol
  • std::atoll
• 2 According to NumberType, the function calls
  • std::strtol
  • std::strtoll
  • std::strtoul
  • std::strtoull
  • std::strtof
  • std::strtod
  • std::strtold
• 3 Same as 2, but calls the corresponding wide-string versions
• 4 According to NumberType, the function calls
  • std::stoi
  • std::stol
  • std::stoll
  • std::stoul
  • std::stoull
  • std::stof
  • std::stod
  • std::stold