123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722 |
- // Formatting library for C++ - experimental range support
- //
- // Copyright (c) 2012 - present, Victor Zverovich
- // All rights reserved.
- //
- // For the license information refer to format.h.
- //
- // Copyright (c) 2018 - present, Remotion (Igor Schulz)
- // All Rights Reserved
- // {fmt} support for ranges, containers and types tuple interface.
- #ifndef FMT_RANGES_H_
- #define FMT_RANGES_H_
- #include <initializer_list>
- #include <tuple>
- #include <type_traits>
- #include "format.h"
- FMT_BEGIN_NAMESPACE
- namespace detail {
- template <typename RangeT, typename OutputIterator>
- OutputIterator copy(const RangeT& range, OutputIterator out) {
- for (auto it = range.begin(), end = range.end(); it != end; ++it)
- *out++ = *it;
- return out;
- }
- template <typename OutputIterator>
- OutputIterator copy(const char* str, OutputIterator out) {
- while (*str) *out++ = *str++;
- return out;
- }
- template <typename OutputIterator>
- OutputIterator copy(char ch, OutputIterator out) {
- *out++ = ch;
- return out;
- }
- template <typename OutputIterator>
- OutputIterator copy(wchar_t ch, OutputIterator out) {
- *out++ = ch;
- return out;
- }
- // Returns true if T has a std::string-like interface, like std::string_view.
- template <typename T> class is_std_string_like {
- template <typename U>
- static auto check(U* p)
- -> decltype((void)p->find('a'), p->length(), (void)p->data(), int());
- template <typename> static void check(...);
- public:
- static constexpr const bool value =
- is_string<T>::value ||
- std::is_convertible<T, std_string_view<char>>::value ||
- !std::is_void<decltype(check<T>(nullptr))>::value;
- };
- template <typename Char>
- struct is_std_string_like<fmt::basic_string_view<Char>> : std::true_type {};
- template <typename T> class is_map {
- template <typename U> static auto check(U*) -> typename U::mapped_type;
- template <typename> static void check(...);
- public:
- #ifdef FMT_FORMAT_MAP_AS_LIST
- static constexpr const bool value = false;
- #else
- static constexpr const bool value =
- !std::is_void<decltype(check<T>(nullptr))>::value;
- #endif
- };
- template <typename T> class is_set {
- template <typename U> static auto check(U*) -> typename U::key_type;
- template <typename> static void check(...);
- public:
- #ifdef FMT_FORMAT_SET_AS_LIST
- static constexpr const bool value = false;
- #else
- static constexpr const bool value =
- !std::is_void<decltype(check<T>(nullptr))>::value && !is_map<T>::value;
- #endif
- };
- template <typename... Ts> struct conditional_helper {};
- template <typename T, typename _ = void> struct is_range_ : std::false_type {};
- #if !FMT_MSC_VERSION || FMT_MSC_VERSION > 1800
- # define FMT_DECLTYPE_RETURN(val) \
- ->decltype(val) { return val; } \
- static_assert( \
- true, "") // This makes it so that a semicolon is required after the
- // macro, which helps clang-format handle the formatting.
- // C array overload
- template <typename T, std::size_t N>
- auto range_begin(const T (&arr)[N]) -> const T* {
- return arr;
- }
- template <typename T, std::size_t N>
- auto range_end(const T (&arr)[N]) -> const T* {
- return arr + N;
- }
- template <typename T, typename Enable = void>
- struct has_member_fn_begin_end_t : std::false_type {};
- template <typename T>
- struct has_member_fn_begin_end_t<T, void_t<decltype(std::declval<T>().begin()),
- decltype(std::declval<T>().end())>>
- : std::true_type {};
- // Member function overload
- template <typename T>
- auto range_begin(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).begin());
- template <typename T>
- auto range_end(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).end());
- // ADL overload. Only participates in overload resolution if member functions
- // are not found.
- template <typename T>
- auto range_begin(T&& rng)
- -> enable_if_t<!has_member_fn_begin_end_t<T&&>::value,
- decltype(begin(static_cast<T&&>(rng)))> {
- return begin(static_cast<T&&>(rng));
- }
- template <typename T>
- auto range_end(T&& rng) -> enable_if_t<!has_member_fn_begin_end_t<T&&>::value,
- decltype(end(static_cast<T&&>(rng)))> {
- return end(static_cast<T&&>(rng));
- }
- template <typename T, typename Enable = void>
- struct has_const_begin_end : std::false_type {};
- template <typename T, typename Enable = void>
- struct has_mutable_begin_end : std::false_type {};
- template <typename T>
- struct has_const_begin_end<
- T,
- void_t<
- decltype(detail::range_begin(std::declval<const remove_cvref_t<T>&>())),
- decltype(detail::range_end(std::declval<const remove_cvref_t<T>&>()))>>
- : std::true_type {};
- template <typename T>
- struct has_mutable_begin_end<
- T, void_t<decltype(detail::range_begin(std::declval<T>())),
- decltype(detail::range_end(std::declval<T>())),
- enable_if_t<std::is_copy_constructible<T>::value>>>
- : std::true_type {};
- template <typename T>
- struct is_range_<T, void>
- : std::integral_constant<bool, (has_const_begin_end<T>::value ||
- has_mutable_begin_end<T>::value)> {};
- # undef FMT_DECLTYPE_RETURN
- #endif
- // tuple_size and tuple_element check.
- template <typename T> class is_tuple_like_ {
- template <typename U>
- static auto check(U* p) -> decltype(std::tuple_size<U>::value, int());
- template <typename> static void check(...);
- public:
- static constexpr const bool value =
- !std::is_void<decltype(check<T>(nullptr))>::value;
- };
- // Check for integer_sequence
- #if defined(__cpp_lib_integer_sequence) || FMT_MSC_VERSION >= 1900
- template <typename T, T... N>
- using integer_sequence = std::integer_sequence<T, N...>;
- template <size_t... N> using index_sequence = std::index_sequence<N...>;
- template <size_t N> using make_index_sequence = std::make_index_sequence<N>;
- #else
- template <typename T, T... N> struct integer_sequence {
- using value_type = T;
- static FMT_CONSTEXPR size_t size() { return sizeof...(N); }
- };
- template <size_t... N> using index_sequence = integer_sequence<size_t, N...>;
- template <typename T, size_t N, T... Ns>
- struct make_integer_sequence : make_integer_sequence<T, N - 1, N - 1, Ns...> {};
- template <typename T, T... Ns>
- struct make_integer_sequence<T, 0, Ns...> : integer_sequence<T, Ns...> {};
- template <size_t N>
- using make_index_sequence = make_integer_sequence<size_t, N>;
- #endif
- template <typename T>
- using tuple_index_sequence = make_index_sequence<std::tuple_size<T>::value>;
- template <typename T, typename C, bool = is_tuple_like_<T>::value>
- class is_tuple_formattable_ {
- public:
- static constexpr const bool value = false;
- };
- template <typename T, typename C> class is_tuple_formattable_<T, C, true> {
- template <std::size_t... I>
- static std::true_type check2(index_sequence<I...>,
- integer_sequence<bool, (I == I)...>);
- static std::false_type check2(...);
- template <std::size_t... I>
- static decltype(check2(
- index_sequence<I...>{},
- integer_sequence<
- bool, (is_formattable<typename std::tuple_element<I, T>::type,
- C>::value)...>{})) check(index_sequence<I...>);
- public:
- static constexpr const bool value =
- decltype(check(tuple_index_sequence<T>{}))::value;
- };
- template <class Tuple, class F, size_t... Is>
- void for_each(index_sequence<Is...>, Tuple&& tup, F&& f) noexcept {
- using std::get;
- // using free function get<I>(T) now.
- const int _[] = {0, ((void)f(get<Is>(tup)), 0)...};
- (void)_; // blocks warnings
- }
- template <class T>
- FMT_CONSTEXPR make_index_sequence<std::tuple_size<T>::value> get_indexes(
- T const&) {
- return {};
- }
- template <class Tuple, class F> void for_each(Tuple&& tup, F&& f) {
- const auto indexes = get_indexes(tup);
- for_each(indexes, std::forward<Tuple>(tup), std::forward<F>(f));
- }
- #if FMT_MSC_VERSION && FMT_MSC_VERSION < 1920
- // Older MSVC doesn't get the reference type correctly for arrays.
- template <typename R> struct range_reference_type_impl {
- using type = decltype(*detail::range_begin(std::declval<R&>()));
- };
- template <typename T, std::size_t N> struct range_reference_type_impl<T[N]> {
- using type = T&;
- };
- template <typename T>
- using range_reference_type = typename range_reference_type_impl<T>::type;
- #else
- template <typename Range>
- using range_reference_type =
- decltype(*detail::range_begin(std::declval<Range&>()));
- #endif
- // We don't use the Range's value_type for anything, but we do need the Range's
- // reference type, with cv-ref stripped.
- template <typename Range>
- using uncvref_type = remove_cvref_t<range_reference_type<Range>>;
- template <typename Range>
- using uncvref_first_type =
- remove_cvref_t<decltype(std::declval<range_reference_type<Range>>().first)>;
- template <typename Range>
- using uncvref_second_type = remove_cvref_t<
- decltype(std::declval<range_reference_type<Range>>().second)>;
- template <typename OutputIt> OutputIt write_delimiter(OutputIt out) {
- *out++ = ',';
- *out++ = ' ';
- return out;
- }
- template <typename Char, typename OutputIt>
- auto write_range_entry(OutputIt out, basic_string_view<Char> str) -> OutputIt {
- return write_escaped_string(out, str);
- }
- template <typename Char, typename OutputIt, typename T,
- FMT_ENABLE_IF(std::is_convertible<T, std_string_view<char>>::value)>
- inline auto write_range_entry(OutputIt out, const T& str) -> OutputIt {
- auto sv = std_string_view<Char>(str);
- return write_range_entry<Char>(out, basic_string_view<Char>(sv));
- }
- template <typename Char, typename OutputIt, typename Arg,
- FMT_ENABLE_IF(std::is_same<Arg, Char>::value)>
- OutputIt write_range_entry(OutputIt out, const Arg v) {
- return write_escaped_char(out, v);
- }
- template <
- typename Char, typename OutputIt, typename Arg,
- FMT_ENABLE_IF(!is_std_string_like<typename std::decay<Arg>::type>::value &&
- !std::is_same<Arg, Char>::value)>
- OutputIt write_range_entry(OutputIt out, const Arg& v) {
- return write<Char>(out, v);
- }
- } // namespace detail
- template <typename T> struct is_tuple_like {
- static constexpr const bool value =
- detail::is_tuple_like_<T>::value && !detail::is_range_<T>::value;
- };
- template <typename T, typename C> struct is_tuple_formattable {
- static constexpr const bool value =
- detail::is_tuple_formattable_<T, C>::value;
- };
- template <typename TupleT, typename Char>
- struct formatter<TupleT, Char,
- enable_if_t<fmt::is_tuple_like<TupleT>::value &&
- fmt::is_tuple_formattable<TupleT, Char>::value>> {
- private:
- basic_string_view<Char> separator_ = detail::string_literal<Char, ',', ' '>{};
- basic_string_view<Char> opening_bracket_ =
- detail::string_literal<Char, '('>{};
- basic_string_view<Char> closing_bracket_ =
- detail::string_literal<Char, ')'>{};
- // C++11 generic lambda for format().
- template <typename FormatContext> struct format_each {
- template <typename T> void operator()(const T& v) {
- if (i > 0) out = detail::copy_str<Char>(separator, out);
- out = detail::write_range_entry<Char>(out, v);
- ++i;
- }
- int i;
- typename FormatContext::iterator& out;
- basic_string_view<Char> separator;
- };
- public:
- FMT_CONSTEXPR formatter() {}
- FMT_CONSTEXPR void set_separator(basic_string_view<Char> sep) {
- separator_ = sep;
- }
- FMT_CONSTEXPR void set_brackets(basic_string_view<Char> open,
- basic_string_view<Char> close) {
- opening_bracket_ = open;
- closing_bracket_ = close;
- }
- template <typename ParseContext>
- FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
- return ctx.begin();
- }
- template <typename FormatContext = format_context>
- auto format(const TupleT& values, FormatContext& ctx) const
- -> decltype(ctx.out()) {
- auto out = ctx.out();
- out = detail::copy_str<Char>(opening_bracket_, out);
- detail::for_each(values, format_each<FormatContext>{0, out, separator_});
- out = detail::copy_str<Char>(closing_bracket_, out);
- return out;
- }
- };
- template <typename T, typename Char> struct is_range {
- static constexpr const bool value =
- detail::is_range_<T>::value && !detail::is_std_string_like<T>::value &&
- !std::is_convertible<T, std::basic_string<Char>>::value &&
- !std::is_convertible<T, detail::std_string_view<Char>>::value;
- };
- namespace detail {
- template <typename Context> struct range_mapper {
- using mapper = arg_mapper<Context>;
- template <typename T,
- FMT_ENABLE_IF(has_formatter<remove_cvref_t<T>, Context>::value)>
- static auto map(T&& value) -> T&& {
- return static_cast<T&&>(value);
- }
- template <typename T,
- FMT_ENABLE_IF(!has_formatter<remove_cvref_t<T>, Context>::value)>
- static auto map(T&& value)
- -> decltype(mapper().map(static_cast<T&&>(value))) {
- return mapper().map(static_cast<T&&>(value));
- }
- };
- template <typename Char, typename Element>
- using range_formatter_type = conditional_t<
- is_formattable<Element, Char>::value,
- formatter<remove_cvref_t<decltype(range_mapper<buffer_context<Char>>{}.map(
- std::declval<Element>()))>,
- Char>,
- fallback_formatter<Element, Char>>;
- template <typename R>
- using maybe_const_range =
- conditional_t<has_const_begin_end<R>::value, const R, R>;
- // Workaround a bug in MSVC 2015 and earlier.
- #if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1910
- template <typename R, typename Char>
- struct is_formattable_delayed
- : disjunction<
- is_formattable<uncvref_type<maybe_const_range<R>>, Char>,
- has_fallback_formatter<uncvref_type<maybe_const_range<R>>, Char>> {};
- #endif
- } // namespace detail
- template <typename T, typename Char, typename Enable = void>
- struct range_formatter;
- template <typename T, typename Char>
- struct range_formatter<
- T, Char,
- enable_if_t<conjunction<
- std::is_same<T, remove_cvref_t<T>>,
- disjunction<is_formattable<T, Char>,
- detail::has_fallback_formatter<T, Char>>>::value>> {
- private:
- detail::range_formatter_type<Char, T> underlying_;
- bool custom_specs_ = false;
- basic_string_view<Char> separator_ = detail::string_literal<Char, ',', ' '>{};
- basic_string_view<Char> opening_bracket_ =
- detail::string_literal<Char, '['>{};
- basic_string_view<Char> closing_bracket_ =
- detail::string_literal<Char, ']'>{};
- template <class U>
- FMT_CONSTEXPR static auto maybe_set_debug_format(U& u, int)
- -> decltype(u.set_debug_format()) {
- u.set_debug_format();
- }
- template <class U>
- FMT_CONSTEXPR static void maybe_set_debug_format(U&, ...) {}
- FMT_CONSTEXPR void maybe_set_debug_format() {
- maybe_set_debug_format(underlying_, 0);
- }
- public:
- FMT_CONSTEXPR range_formatter() {}
- FMT_CONSTEXPR auto underlying() -> detail::range_formatter_type<Char, T>& {
- return underlying_;
- }
- FMT_CONSTEXPR void set_separator(basic_string_view<Char> sep) {
- separator_ = sep;
- }
- FMT_CONSTEXPR void set_brackets(basic_string_view<Char> open,
- basic_string_view<Char> close) {
- opening_bracket_ = open;
- closing_bracket_ = close;
- }
- template <typename ParseContext>
- FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
- auto it = ctx.begin();
- auto end = ctx.end();
- if (it == end || *it == '}') {
- maybe_set_debug_format();
- return it;
- }
- if (*it == 'n') {
- set_brackets({}, {});
- ++it;
- }
- if (*it == '}') {
- maybe_set_debug_format();
- return it;
- }
- if (*it != ':')
- FMT_THROW(format_error("no other top-level range formatters supported"));
- custom_specs_ = true;
- ++it;
- ctx.advance_to(it);
- return underlying_.parse(ctx);
- }
- template <typename R, class FormatContext>
- auto format(R&& range, FormatContext& ctx) const -> decltype(ctx.out()) {
- detail::range_mapper<buffer_context<Char>> mapper;
- auto out = ctx.out();
- out = detail::copy_str<Char>(opening_bracket_, out);
- int i = 0;
- auto it = detail::range_begin(range);
- auto end = detail::range_end(range);
- for (; it != end; ++it) {
- if (i > 0) out = detail::copy_str<Char>(separator_, out);
- ;
- ctx.advance_to(out);
- out = underlying_.format(mapper.map(*it), ctx);
- ++i;
- }
- out = detail::copy_str<Char>(closing_bracket_, out);
- return out;
- }
- };
- enum class range_format { disabled, map, set, sequence, string, debug_string };
- namespace detail {
- template <typename T> struct range_format_kind_ {
- static constexpr auto value = std::is_same<range_reference_type<T>, T>::value
- ? range_format::disabled
- : is_map<T>::value ? range_format::map
- : is_set<T>::value ? range_format::set
- : range_format::sequence;
- };
- template <range_format K, typename R, typename Char, typename Enable = void>
- struct range_default_formatter;
- template <range_format K>
- using range_format_constant = std::integral_constant<range_format, K>;
- template <range_format K, typename R, typename Char>
- struct range_default_formatter<
- K, R, Char,
- enable_if_t<(K == range_format::sequence || K == range_format::map ||
- K == range_format::set)>> {
- using range_type = detail::maybe_const_range<R>;
- range_formatter<detail::uncvref_type<range_type>, Char> underlying_;
- FMT_CONSTEXPR range_default_formatter() { init(range_format_constant<K>()); }
- FMT_CONSTEXPR void init(range_format_constant<range_format::set>) {
- underlying_.set_brackets(detail::string_literal<Char, '{'>{},
- detail::string_literal<Char, '}'>{});
- }
- FMT_CONSTEXPR void init(range_format_constant<range_format::map>) {
- underlying_.set_brackets(detail::string_literal<Char, '{'>{},
- detail::string_literal<Char, '}'>{});
- underlying_.underlying().set_brackets({}, {});
- underlying_.underlying().set_separator(
- detail::string_literal<Char, ':', ' '>{});
- }
- FMT_CONSTEXPR void init(range_format_constant<range_format::sequence>) {}
- template <typename ParseContext>
- FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
- return underlying_.parse(ctx);
- }
- template <typename FormatContext>
- auto format(range_type& range, FormatContext& ctx) const
- -> decltype(ctx.out()) {
- return underlying_.format(range, ctx);
- }
- };
- } // namespace detail
- template <typename T, typename Char, typename Enable = void>
- struct range_format_kind
- : conditional_t<
- is_range<T, Char>::value, detail::range_format_kind_<T>,
- std::integral_constant<range_format, range_format::disabled>> {};
- template <typename R, typename Char>
- struct formatter<
- R, Char,
- enable_if_t<conjunction<bool_constant<range_format_kind<R, Char>::value !=
- range_format::disabled>
- // Workaround a bug in MSVC 2015 and earlier.
- #if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1910
- ,
- detail::is_formattable_delayed<R, Char>
- #endif
- >::value>>
- : detail::range_default_formatter<range_format_kind<R, Char>::value, R,
- Char> {
- };
- template <typename Char, typename... T> struct tuple_join_view : detail::view {
- const std::tuple<T...>& tuple;
- basic_string_view<Char> sep;
- tuple_join_view(const std::tuple<T...>& t, basic_string_view<Char> s)
- : tuple(t), sep{s} {}
- };
- template <typename Char, typename... T>
- using tuple_arg_join = tuple_join_view<Char, T...>;
- // Define FMT_TUPLE_JOIN_SPECIFIERS to enable experimental format specifiers
- // support in tuple_join. It is disabled by default because of issues with
- // the dynamic width and precision.
- #ifndef FMT_TUPLE_JOIN_SPECIFIERS
- # define FMT_TUPLE_JOIN_SPECIFIERS 0
- #endif
- template <typename Char, typename... T>
- struct formatter<tuple_join_view<Char, T...>, Char> {
- template <typename ParseContext>
- FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
- return do_parse(ctx, std::integral_constant<size_t, sizeof...(T)>());
- }
- template <typename FormatContext>
- auto format(const tuple_join_view<Char, T...>& value,
- FormatContext& ctx) const -> typename FormatContext::iterator {
- return do_format(value, ctx,
- std::integral_constant<size_t, sizeof...(T)>());
- }
- private:
- std::tuple<formatter<typename std::decay<T>::type, Char>...> formatters_;
- template <typename ParseContext>
- FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
- std::integral_constant<size_t, 0>)
- -> decltype(ctx.begin()) {
- return ctx.begin();
- }
- template <typename ParseContext, size_t N>
- FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
- std::integral_constant<size_t, N>)
- -> decltype(ctx.begin()) {
- auto end = ctx.begin();
- #if FMT_TUPLE_JOIN_SPECIFIERS
- end = std::get<sizeof...(T) - N>(formatters_).parse(ctx);
- if (N > 1) {
- auto end1 = do_parse(ctx, std::integral_constant<size_t, N - 1>());
- if (end != end1)
- FMT_THROW(format_error("incompatible format specs for tuple elements"));
- }
- #endif
- return end;
- }
- template <typename FormatContext>
- auto do_format(const tuple_join_view<Char, T...>&, FormatContext& ctx,
- std::integral_constant<size_t, 0>) const ->
- typename FormatContext::iterator {
- return ctx.out();
- }
- template <typename FormatContext, size_t N>
- auto do_format(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
- std::integral_constant<size_t, N>) const ->
- typename FormatContext::iterator {
- auto out = std::get<sizeof...(T) - N>(formatters_)
- .format(std::get<sizeof...(T) - N>(value.tuple), ctx);
- if (N > 1) {
- out = std::copy(value.sep.begin(), value.sep.end(), out);
- ctx.advance_to(out);
- return do_format(value, ctx, std::integral_constant<size_t, N - 1>());
- }
- return out;
- }
- };
- FMT_MODULE_EXPORT_BEGIN
- /**
- \rst
- Returns an object that formats `tuple` with elements separated by `sep`.
- **Example**::
- std::tuple<int, char> t = {1, 'a'};
- fmt::print("{}", fmt::join(t, ", "));
- // Output: "1, a"
- \endrst
- */
- template <typename... T>
- FMT_CONSTEXPR auto join(const std::tuple<T...>& tuple, string_view sep)
- -> tuple_join_view<char, T...> {
- return {tuple, sep};
- }
- template <typename... T>
- FMT_CONSTEXPR auto join(const std::tuple<T...>& tuple,
- basic_string_view<wchar_t> sep)
- -> tuple_join_view<wchar_t, T...> {
- return {tuple, sep};
- }
- /**
- \rst
- Returns an object that formats `initializer_list` with elements separated by
- `sep`.
- **Example**::
- fmt::print("{}", fmt::join({1, 2, 3}, ", "));
- // Output: "1, 2, 3"
- \endrst
- */
- template <typename T>
- auto join(std::initializer_list<T> list, string_view sep)
- -> join_view<const T*, const T*> {
- return join(std::begin(list), std::end(list), sep);
- }
- FMT_MODULE_EXPORT_END
- FMT_END_NAMESPACE
- #endif // FMT_RANGES_H_
|