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Implement fmt::format_to into std::vector<char> (#4211)

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* Implement fmt::format_to into std::vector<char>

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

* Move get_container to the trait

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

---------

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov
2024-10-26 09:23:59 -07:00
committed by GitHub
parent 4daa3d591f
commit 168df9a064
2 changed files with 31 additions and 4 deletions
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include/fmt/base.h
+23 -1
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@@ -1973,15 +1973,37 @@ template <typename T = char> class counting_buffer : public buffer<T> {
template <typename T>
struct is_back_insert_iterator<basic_appender<T>> : std::true_type {};
template <typename OutputIt, typename InputIt, typename = void>
struct has_back_insert_iterator_container_append : std::false_type {};
template <typename OutputIt, typename InputIt>
struct has_back_insert_iterator_container_append<
OutputIt, InputIt,
void_t<decltype(get_container(std::declval<OutputIt>())
.append(std::declval<InputIt>(),
std::declval<InputIt>()))>> : std::true_type {};
// An optimized version of std::copy with the output value type (T).
template <typename T, typename InputIt, typename OutputIt,
FMT_ENABLE_IF(is_back_insert_iterator<OutputIt>::value)>
FMT_ENABLE_IF(is_back_insert_iterator<OutputIt>::value&&
has_back_insert_iterator_container_append<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR20 auto copy(InputIt begin, InputIt end, OutputIt out)
-> OutputIt {
get_container(out).append(begin, end);
return out;
}
template <typename T, typename InputIt, typename OutputIt,
FMT_ENABLE_IF(is_back_insert_iterator<OutputIt>::value &&
!has_back_insert_iterator_container_append<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR20 auto copy(InputIt begin, InputIt end, OutputIt out)
-> OutputIt {
auto& c = get_container(out);
c.insert(c.end(), begin, end);
return out;
}
template <typename T, typename InputIt, typename OutputIt,
FMT_ENABLE_IF(!is_back_insert_iterator<OutputIt>::value)>
FMT_CONSTEXPR auto copy(InputIt begin, InputIt end, OutputIt out) -> OutputIt {