clyne/constexpr-to-string
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Forgot to support to_string<0>

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Clyne 2020-06-26 17:47:48 -04:00 committed by GitHub
parent 4cffc3ffbc
commit 1d8ef0361c
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1 changed files with 11 additions and 7 deletions
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18
to_string.hpp
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@ -22,7 +22,7 @@ struct to_string_t {
// The lambda calculates what the string length of N will be, so that `buf`
// fits to the number perfectly.
char buf[([] {
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);
return len;
}())] = {};
@ -31,12 +31,16 @@ struct to_string_t {
* Constructs the object, filling `buf` with the string representation of N.
*/
constexpr to_string_t() noexcept {
auto ptr = buf + sizeof(buf) / sizeof(buf[0]);
*--ptr = '\0';
for (auto n = N < 0 ? -N : N; n; n /= base)
*--ptr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[n % base];
if (N < 0)
*--ptr = '-';
if (N != 0) {
auto ptr = buf + sizeof(buf) / sizeof(buf[0]);
*--ptr = '\0';
for (auto n = N < 0 ? -N : N; n; n /= base)
*--ptr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[n % base];
if (N < 0)
*--ptr = '-';
} else {
buf[0] = '0';
}
}
/**