diff options
| -rw-r--r-- | README.md | 4 | ||||
| -rw-r--r-- | to_string.hpp | 7 |
2 files changed, 8 insertions, 3 deletions
@@ -48,11 +48,13 @@ The integer/string conversion is done using a simple method I learned over the y (*Note: The below examples of code are not up-to-date, though they still give a general idea of how `to_string` works.*) ```cpp +constexpr char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + constexpr to_string_t() { auto ptr = buf + sizeof(buf) / sizeof(buf[0]); *--ptr = '\0'; for (auto n = N < 0 ? -N : N; n; n /= base) - *--ptr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[n % base]; + *--ptr = digits[n % base]; if (N < 0) *--ptr = '-'; } diff --git a/to_string.hpp b/to_string.hpp index 1d88b1a..2d18589 100644 --- a/to_string.hpp +++ b/to_string.hpp @@ -9,6 +9,9 @@ #include <type_traits> +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 +20,7 @@ */ template<auto N, unsigned 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> struct to_string_t { // The lambda calculates what the string length of N will be, so that `buf` // fits to the number perfectly. @@ -35,7 +38,7 @@ struct to_string_t { auto ptr = buf + sizeof(buf) / sizeof(buf[0]); *--ptr = '\0'; for (auto n = N < 0 ? -N : N; n; n /= base) - *--ptr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[n % base]; + *--ptr = digits[n % base]; if (N < 0) *--ptr = '-'; } else { |