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Improve symbol sizes

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This commit is contained in:
Victor Zverovich 2021-05-20 07:21:20 -07:00
parent 63271a51c4
commit 24b677d053
1 changed files with 42 additions and 36 deletions
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78
include/fmt/core.h
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@ -693,6 +693,8 @@ template <typename T> struct is_contiguous : std::false_type {};
template <typename Char>
struct is_contiguous<std::basic_string<Char>> : std::true_type {};
class appender;
FMT_BEGIN_DETAIL_NAMESPACE
// Extracts a reference to the container from back_insert_iterator.
@ -901,30 +903,11 @@ template <typename T = char> class counting_buffer final : public buffer<T> {
size_t count() { return count_ + this->size(); }
};
// An output iterator that appends to the buffer.
// It is used to reduce symbol sizes for the common case.
template <typename T>
class buffer_appender : public std::back_insert_iterator<buffer<T>> {
using base = std::back_insert_iterator<buffer<T>>;
using buffer_appender = conditional_t<std::is_same<T, char>::value, appender,
std::back_insert_iterator<buffer<T>>>;
public:
using std::back_insert_iterator<buffer<T>>::back_insert_iterator;
buffer_appender(base it) : base(it) {}
using _Unchecked_type = buffer_appender; // Mark iterator as checked.
buffer_appender& operator++() {
base::operator++();
return *this;
}
buffer_appender operator++(int) {
buffer_appender tmp = *this;
++*this;
return tmp;
}
};
// Maps an output iterator into a buffer.
// Maps an output iterator to a buffer.
template <typename T, typename OutputIt>
iterator_buffer<OutputIt, T> get_buffer(OutputIt);
template <typename T> buffer<T>& get_buffer(buffer_appender<T>);
@ -932,15 +915,12 @@ template <typename T> buffer<T>& get_buffer(buffer_appender<T>);
template <typename OutputIt> OutputIt get_buffer_init(OutputIt out) {
return out;
}
template <typename T> buffer<T>& get_buffer_init(buffer_appender<T> out) {
return get_container(out);
}
template <typename Buffer>
auto get_iterator(Buffer& buf) -> decltype(buf.out()) {
return buf.out();
}
template <typename T> buffer_appender<T> get_iterator(buffer<T>& buf) {
template <typename T> auto get_iterator(buffer<T>& buf) -> buffer_appender<T> {
return buffer_appender<T>(buf);
}
@ -1318,6 +1298,32 @@ enum : unsigned long long { has_named_args_bit = 1ULL << 62 };
FMT_END_DETAIL_NAMESPACE
// An output iterator that appends to a buffer.
// It is used to reduce symbol sizes for the common case.
class appender : public std::back_insert_iterator<detail::buffer<char>> {
using base = std::back_insert_iterator<detail::buffer<char>>;
friend detail::buffer<char>& get_buffer_init(appender out) {
return detail::get_container(out);
}
public:
using std::back_insert_iterator<detail::buffer<char>>::back_insert_iterator;
appender(base it) : base(it) {}
using _Unchecked_type = appender; // Mark iterator as checked.
auto operator++() -> appender& {
base::operator++();
return *this;
}
auto operator++(int) -> appender {
auto tmp = *this;
++*this;
return tmp;
}
};
// A formatting argument. It is a trivially copyable/constructible type to
// allow storage in basic_memory_buffer.
template <typename Context> class basic_format_arg {
@ -1451,9 +1457,8 @@ struct is_contiguous_back_insert_iterator : std::false_type {};
template <typename Container>
struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>>
: is_contiguous<Container> {};
template <typename Char>
struct is_contiguous_back_insert_iterator<buffer_appender<Char>>
: std::true_type {};
template <>
struct is_contiguous_back_insert_iterator<appender> : std::true_type {};
// A type-erased reference to an std::locale to avoid heavy <locale> include.
class locale_ref {
@ -2795,7 +2800,8 @@ FMT_INLINE auto format(format_string<T...> fmt, T&&... args) -> std::string {
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 {
decltype(detail::get_buffer<char>(out)) buf(detail::get_buffer_init(out));
using detail::get_buffer_init;
decltype(detail::get_buffer<char>(out)) buf(get_buffer_init(out));
detail::vformat_to(buf, string_view(fmt), args);
return detail::get_iterator(buf);
}
@ -2814,7 +2820,7 @@ auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt {
*/
template <typename OutputIt, typename... T,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
inline auto format_to(OutputIt out, format_string<T...> fmt, T&&... args)
FMT_INLINE auto format_to(OutputIt out, format_string<T...> fmt, T&&... args)
-> OutputIt {
return vformat_to(out, fmt, fmt::make_format_args(args...));
}
@ -2846,14 +2852,14 @@ auto vformat_to_n(OutputIt out, size_t n, string_view fmt, format_args args)
*/
template <typename OutputIt, typename... T,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
inline auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt,
const T&... args) -> format_to_n_result<OutputIt> {
FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt,
const T&... args) -> format_to_n_result<OutputIt> {
return vformat_to_n(out, n, fmt, fmt::make_format_args(args...));
}
/** Returns the number of chars in the output of ``format(fmt, args...)``. */
template <typename... T>
inline auto formatted_size(format_string<T...> fmt, T&&... args) -> size_t {
FMT_INLINE auto formatted_size(format_string<T...> fmt, T&&... args) -> size_t {
auto buf = detail::counting_buffer<>();
detail::vformat_to(buf, string_view(fmt), fmt::make_format_args(args...));
return buf.count();
@ -2873,7 +2879,7 @@ FMT_API void vprint(std::FILE*, string_view, format_args);
\endrst
*/
template <typename... T>
inline void print(format_string<T...> fmt, T&&... args) {
FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
const auto& vargs = fmt::make_format_args(args...);
return detail::is_utf8() ? vprint(fmt, vargs)
: detail::vprint_mojibake(stdout, fmt, vargs);
@ -2890,7 +2896,7 @@ inline void print(format_string<T...> fmt, T&&... args) {
\endrst
*/
template <typename... T>
inline void print(std::FILE* f, format_string<T...> fmt, T&&... args) {
FMT_INLINE void print(std::FILE* f, format_string<T...> fmt, T&&... args) {
const auto& vargs = fmt::make_format_args(args...);
return detail::is_utf8() ? vprint(f, fmt, vargs)
: detail::vprint_mojibake(f, fmt, vargs);