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constexpr-to-string
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Initialize buf for C++17 GCC; make to_string constexpr

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https://www.reddit.com/r/cpp/comments/hgcaih/compiletime_integertostring_conversion_c17/fw3d2fm/
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Clyne 4 years ago committed by GitHub
parent 2be778931d
commit 37b7cd1715
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1 changed files with 3 additions and 3 deletions
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6
to_string.hpp
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@ -25,12 +25,12 @@ struct to_string_t {
unsigned int len = N >= 0 ? 1 : 2; unsigned int len = N >= 0 ? 1 : 2;
for (auto n = N < 0 ? -N : N; n; len++, n /= base); for (auto n = N < 0 ? -N : N; n; len++, n /= base);
return len; return len;
}())]; }())] = {};
/** /**
* Constructs the object, filling `buf` with the string representation of N. * Constructs the object, filling `buf` with the string representation of N.
*/ */
constexpr to_string_t() { constexpr to_string_t() noexcept {
auto ptr = buf + sizeof(buf) / sizeof(buf[0]); auto ptr = buf + sizeof(buf) / sizeof(buf[0]);
*--ptr = '\0'; *--ptr = '\0';
for (auto n = N < 0 ? -N : N; n; n /= base) for (auto n = N < 0 ? -N : N; n; n /= base)
@ -58,6 +58,6 @@ struct to_string_t {
* Simplifies use of `to_string_t` from `to_string_t<N>()` to `to_string<N>`. * Simplifies use of `to_string_t` from `to_string_t<N>()` to `to_string<N>`.
*/ */
template<auto N, unsigned int base = 10> template<auto N, unsigned int base = 10>
to_string_t<N, base> to_string; constexpr to_string_t<N, base> to_string;
#endif // TCSULLIVAN_TO_STRING_HPP_ #endif // TCSULLIVAN_TO_STRING_HPP_

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