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Move copy to format.h

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This commit is contained in:
Victor Zverovich 2026-01-29 21:30:20 -08:00
parent b2a96c6087
commit 26c6b1c23d
4 changed files with 70 additions and 69 deletions
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58
include/fmt/base.h
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@ -2031,64 +2031,6 @@ 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 {};
template <typename OutputIt, typename InputIt, typename = void>
struct has_back_insert_iterator_container_insert_at_end : std::false_type {};
template <typename OutputIt, typename InputIt>
struct has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt,
void_t<decltype(get_container(std::declval<OutputIt>())
.insert(get_container(std::declval<OutputIt>()).end(),
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&&
has_back_insert_iterator_container_append<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR 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 &&
has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR 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 &&
(has_back_insert_iterator_container_append<
OutputIt, InputIt>::value ||
has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt>::value)))>
FMT_CONSTEXPR auto copy(InputIt begin, InputIt end, OutputIt out) -> OutputIt {
while (begin != end) *out++ = static_cast<T>(*begin++);
return out;
}
template <typename T, typename V, typename OutputIt>
FMT_CONSTEXPR auto copy(basic_string_view<V> s, OutputIt out) -> OutputIt {
return copy<T>(s.begin(), s.end(), out);
}
template <typename It, typename Enable = std::true_type>
struct is_buffer_appender : std::false_type {};
template <typename It>

59
include/fmt/format.h
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@ -567,6 +567,65 @@ FMT_CONSTEXPR20 auto fill_n(T* out, Size count, char value) -> T* {
return out + count;
}
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 {};
template <typename OutputIt, typename InputIt, typename = void>
struct has_back_insert_iterator_container_insert_at_end : std::false_type {};
template <typename OutputIt, typename InputIt>
struct has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt,
void_t<decltype(get_container(std::declval<OutputIt>())
.insert(get_container(std::declval<OutputIt>()).end(),
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&&
has_back_insert_iterator_container_append<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR 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 &&
has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt>::value)>
FMT_CONSTEXPR 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 &&
(has_back_insert_iterator_container_append<
OutputIt, InputIt>::value ||
has_back_insert_iterator_container_insert_at_end<
OutputIt, InputIt>::value)))>
FMT_CONSTEXPR auto copy(InputIt begin, InputIt end, OutputIt out) -> OutputIt {
while (begin != end) *out++ = static_cast<T>(*begin++);
return out;
}
template <typename T, typename V, typename OutputIt>
FMT_CONSTEXPR auto copy(basic_string_view<V> s, OutputIt out) -> OutputIt {
return copy<T>(s.begin(), s.end(), out);
}
template <typename OutChar, typename InputIt, typename OutputIt>
FMT_CONSTEXPR FMT_NOINLINE auto copy_noinline(InputIt begin, InputIt end,
OutputIt out) -> OutputIt {

11
test/base-test.cc
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@ -282,17 +282,6 @@ TEST(base_test, is_back_insert_iterator) {
std::front_insert_iterator<std::string>>::value);
}
struct minimal_container {
using value_type = char;
void push_back(char) {}
};
TEST(base_test, copy) {
minimal_container c;
static constexpr char str[] = "a";
fmt::detail::copy<char>(str, str + 1, std::back_inserter(c));
}
TEST(base_test, get_buffer) {
mock_buffer<char> buffer;
void* buffer_ptr = &buffer;

11
test/format-test.cc
View File

@ -196,6 +196,17 @@ TEST(util_test, increment) {
EXPECT_STREQ("200", s);
}
struct minimal_container {
using value_type = char;
void push_back(char) {}
};
TEST(util_test, copy) {
minimal_container c;
static constexpr char str[] = "a";
fmt::detail::copy<char>(str, str + 1, std::back_inserter(c));
}
TEST(util_test, parse_nonnegative_int) {
auto s = fmt::string_view("10000000000");
auto begin = s.begin(), end = s.end();