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Optimize integer formatting without padding

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Victor Zverovich 2021-03-11 14:11:48 -08:00
parent a1ea8a82c3
commit eef4ba9c02
1 changed files with 12 additions and 6 deletions
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18
include/fmt/format.h
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@ -1680,18 +1680,24 @@ template <typename Char> struct write_int_data {
// Writes an integer in the format
// <left-padding><prefix><numeric-padding><digits><right-padding>
// where <digits> are written by f(it).
template <typename OutputIt, typename Char, typename F>
FMT_CONSTEXPR OutputIt write_int(OutputIt out, int num_digits,
string_view prefix,
const basic_format_specs<Char>& specs, F f) {
// where <digits> are written by write_digits(it).
template <typename OutputIt, typename Char, typename W>
FMT_CONSTEXPR FMT_INLINE OutputIt
write_int(OutputIt out, int num_digits, string_view prefix,
const basic_format_specs<Char>& specs, W write_digits) {
if (specs.width == 0 && specs.precision < 0) {
auto it = reserve(out, to_unsigned(num_digits) + prefix.size());
if (prefix.size() != 0)
it = copy_str<Char>(prefix.begin(), prefix.end(), it);
return base_iterator(out, write_digits(it));
}
auto data = write_int_data<Char>(num_digits, prefix, specs);
return write_padded<align::right>(
out, specs, data.size, [=](reserve_iterator<OutputIt> it) {
if (prefix.size() != 0)
it = copy_str<Char>(prefix.begin(), prefix.end(), it);
it = detail::fill_n(it, data.padding, static_cast<Char>('0'));
return f(it);
return write_digits(it);
});
}