constexpr char_type to_upper(char_type const c) noexcept
Converts 'a'-'z' to 'A'-'Z' respectively; other characters are returned as is.
Definition: transform.hpp:97
constexpr char_type to_lower(char_type const c) noexcept
Converts 'A'-'Z' to 'a'-'z' respectively; other characters are returned as is.
Definition: transform.hpp:81