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Simplify buffer extraction

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This commit is contained in:
Victor Zverovich 2021-05-21 20:15:56 -07:00
parent 2617384d8e
commit 1c83a49be9
4 changed files with 9 additions and 11 deletions
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2
include/fmt/color.h
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@ -594,7 +594,7 @@ template <typename OutputIt, typename Char,
OutputIt vformat_to(
OutputIt out, const text_style& ts, basic_string_view<Char> format_str,
basic_format_args<buffer_context<type_identity_t<Char>>> args) {
detail::get_buffer_t<OutputIt, Char> buf(detail::get_buffer(out));
auto&& buf = detail::get_buffer<Char>(out);
detail::vformat_to(buf, ts, format_str, args);
return detail::get_iterator(buf);
}

14
include/fmt/core.h
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@ -763,6 +763,7 @@ template <typename T> class buffer {
buffer(const buffer&) = delete;
void operator=(const buffer&) = delete;
buffer(buffer&&) = default;
auto begin() FMT_NOEXCEPT -> T* { return ptr_; }
auto end() FMT_NOEXCEPT -> T* { return ptr_ + size_; }
@ -924,13 +925,9 @@ using buffer_appender = conditional_t<std::is_same<T, char>::value, appender,
std::back_insert_iterator<buffer<T>>>;
// Maps an output iterator to a buffer.
template <typename OutputIt, typename T>
using get_buffer_t =
conditional_t<std::is_same<OutputIt, buffer_appender<T>>::value, buffer<T>&,
iterator_buffer<OutputIt, T>>;
template <typename OutputIt> auto get_buffer(OutputIt out) -> OutputIt {
return out;
template <typename T, typename OutputIt>
auto get_buffer(OutputIt out) -> iterator_buffer<OutputIt, T> {
return iterator_buffer<OutputIt, T>(out);
}
template <typename Buffer>
@ -1340,6 +1337,7 @@ FMT_END_DETAIL_NAMESPACE
class appender : public std::back_insert_iterator<detail::buffer<char>> {
using base = std::back_insert_iterator<detail::buffer<char>>;
template <typename T>
friend auto get_buffer(appender out) -> detail::buffer<char>& {
return detail::get_container(out);
}
@ -2849,7 +2847,7 @@ template <typename OutputIt,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt {
using detail::get_buffer;
detail::get_buffer_t<OutputIt, char> buf(get_buffer(out));
auto&& buf = get_buffer<char>(out);
detail::vformat_to(buf, string_view(fmt), args);
return detail::get_iterator(buf);
}

2
include/fmt/format.h
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@ -2695,7 +2695,7 @@ template <typename OutputIt, typename S, typename Char = char_t<S>,
auto vformat_to(OutputIt out, const S& format_str,
basic_format_args<buffer_context<type_identity_t<Char>>> args)
-> OutputIt {
detail::get_buffer_t<OutputIt, Char> buf(detail::get_buffer(out));
auto&& buf = detail::get_buffer<Char>(out);
detail::vformat_to(buf, to_string_view(format_str), args);
return detail::get_iterator(buf);
}

2
include/fmt/locale.h
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@ -47,7 +47,7 @@ template <typename S, typename OutputIt, typename... Args,
inline OutputIt vformat_to(
OutputIt out, const std::locale& loc, const S& format_str,
basic_format_args<buffer_context<type_identity_t<Char>>> args) {
detail::get_buffer_t<OutputIt, Char> buf(detail::get_buffer(out));
auto&& buf = detail::get_buffer<Char>(out);
vformat_to(buf, to_string_view(format_str), args, detail::locale_ref(loc));
return detail::get_iterator(buf);
}