diff options
Diffstat (limited to 'to_string.hpp')
| -rw-r--r-- | to_string.hpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/to_string.hpp b/to_string.hpp index eb363f0..2ea6a60 100644 --- a/to_string.hpp +++ b/to_string.hpp @@ -9,6 +9,11 @@ #include <type_traits> +namespace constexpr_to_string { + +constexpr char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; +constexpr auto digit_count = sizeof(digits) / sizeof(digits[0]); + /** * @struct to_string_t * @brief Provides the ability to convert any integral to a string at compile-time. @@ -17,7 +22,7 @@ */ template<auto N, int base, typename char_type, std::enable_if_t<std::is_integral_v<decltype(N)>, int> = 0, - std::enable_if_t<(base > 1 && base < 37), int> = 0> + std::enable_if_t<(base > 1 && base < digit_count), int> = 0> class to_string_t { // The lambda calculates what the string length of N will be, so that `buf` // fits to the number perfectly. @@ -36,7 +41,7 @@ class to_string_t { *--ptr = '\0'; if (N != 0) { for (auto n = N; n; n /= base) - *--ptr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[(N < 0 ? -1 : 1) * (n % base)]; + *--ptr = digits[(N < 0 ? -1 : 1) * (n % base)]; if (N < 0) *--ptr = '-'; } else { @@ -65,10 +70,12 @@ class to_string_t { constexpr const auto end() const noexcept { return buf + size(); } }; +} // namespace constexpr_to_string + /** * Simplifies use of `to_string_t` from `to_string_t<N>()` to `to_string<N>`. */ template<auto N, int base = 10, typename char_type = char> -constexpr to_string_t<N, base, char_type> to_string; +constexpr constexpr_to_string::to_string_t<N, base, char_type> to_string; #endif // TCSULLIVAN_TO_STRING_HPP_ |