Function has_hex_prefix

test-app/runtime/src/main/cpp/ada/ada.h:1028–1030

}

constexpr bool has_hex_prefix(std::string_view input) {
  return input.size() >= 2 && has_hex_prefix_unsafe(input);
}

constexpr bool is_digit(char x) noexcept { return (x >= '0') & (x <= '9'); }