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Improve handling of buffer iterator

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This commit is contained in:
Victor Zverovich 2020-07-19 06:49:32 -07:00
parent 26b47b6fb5
commit d615137ca0
1 changed files with 19 additions and 1 deletions
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20
include/fmt/format.h
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@ -343,6 +343,18 @@ template <typename Iterator> inline Iterator& reserve(Iterator& it, size_t) {
return it; return it;
} }
template <typename T, typename OutputIt>
constexpr T* to_pointer(OutputIt, size_t) {
return nullptr;
}
template <typename T> T* to_pointer(buffer_appender<T> it, size_t n) {
buffer<T>& buf = get_container(it);
auto size = buf.size();
if (buf.capacity() < size + n) return nullptr;
buf.try_resize(size + n);
return buf.data() + size;
}
template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
inline std::back_insert_iterator<Container> base_iterator( inline std::back_insert_iterator<Container> base_iterator(
std::back_insert_iterator<Container>& it, std::back_insert_iterator<Container>& it,
@ -1744,7 +1756,13 @@ OutputIt write(OutputIt out, T value) {
// Don't do -abs_value since it trips unsigned-integer-overflow sanitizer. // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer.
if (negative) abs_value = ~abs_value + 1; if (negative) abs_value = ~abs_value + 1;
int num_digits = count_digits(abs_value); int num_digits = count_digits(abs_value);
auto it = reserve(out, (negative ? 1 : 0) + static_cast<size_t>(num_digits)); auto size = (negative ? 1 : 0) + static_cast<size_t>(num_digits);
auto it = reserve(out, size);
if (auto ptr = to_pointer<Char>(it, size)) {
if (negative) *ptr++ = static_cast<Char>('-');
format_decimal<Char>(ptr, abs_value, num_digits);
return out;
}
if (negative) *it++ = static_cast<Char>('-'); if (negative) *it++ = static_cast<Char>('-');
it = format_decimal<Char>(it, abs_value, num_digits).end; it = format_decimal<Char>(it, abs_value, num_digits).end;
return base_iterator(out, it); return base_iterator(out, it);