739 lines
24 KiB
C++
739 lines
24 KiB
C++
// Formatting library for C++ - range and tuple support
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//
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// Copyright (c) 2012 - present, Victor Zverovich and {fmt} contributors
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_RANGES_H_
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#define FMT_RANGES_H_
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#include <initializer_list>
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#include <tuple>
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#include <type_traits>
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#include "format.h"
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FMT_BEGIN_NAMESPACE
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namespace detail {
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template <typename Range, typename OutputIt>
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auto copy(const Range& range, OutputIt out) -> OutputIt {
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for (auto it = range.begin(), end = range.end(); it != end; ++it)
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*out++ = *it;
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return out;
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}
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template <typename OutputIt>
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auto copy(const char* str, OutputIt out) -> OutputIt {
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while (*str) *out++ = *str++;
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return out;
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}
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template <typename OutputIt> auto copy(char ch, OutputIt out) -> OutputIt {
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*out++ = ch;
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return out;
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}
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template <typename OutputIt> auto copy(wchar_t ch, OutputIt out) -> OutputIt {
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*out++ = ch;
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return out;
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}
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// Returns true if T has a std::string-like interface, like std::string_view.
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template <typename T> class is_std_string_like {
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template <typename U>
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static auto check(U* p)
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-> decltype((void)p->find('a'), p->length(), (void)p->data(), int());
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template <typename> static void check(...);
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public:
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static constexpr const bool value =
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is_string<T>::value ||
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std::is_convertible<T, std_string_view<char>>::value ||
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!std::is_void<decltype(check<T>(nullptr))>::value;
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};
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template <typename Char>
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struct is_std_string_like<fmt::basic_string_view<Char>> : std::true_type {};
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template <typename T> class is_map {
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template <typename U> static auto check(U*) -> typename U::mapped_type;
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template <typename> static void check(...);
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public:
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#ifdef FMT_FORMAT_MAP_AS_LIST // DEPRECATED!
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static constexpr const bool value = false;
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#else
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static constexpr const bool value =
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!std::is_void<decltype(check<T>(nullptr))>::value;
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#endif
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};
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template <typename T> class is_set {
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template <typename U> static auto check(U*) -> typename U::key_type;
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template <typename> static void check(...);
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public:
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#ifdef FMT_FORMAT_SET_AS_LIST // DEPRECATED!
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static constexpr const bool value = false;
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#else
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static constexpr const bool value =
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!std::is_void<decltype(check<T>(nullptr))>::value && !is_map<T>::value;
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#endif
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};
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template <typename... Ts> struct conditional_helper {};
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template <typename T, typename _ = void> struct is_range_ : std::false_type {};
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#if !FMT_MSC_VERSION || FMT_MSC_VERSION > 1800
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# define FMT_DECLTYPE_RETURN(val) \
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->decltype(val) { return val; } \
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static_assert( \
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true, "") // This makes it so that a semicolon is required after the
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// macro, which helps clang-format handle the formatting.
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// C array overload
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template <typename T, std::size_t N>
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auto range_begin(const T (&arr)[N]) -> const T* {
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return arr;
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}
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template <typename T, std::size_t N>
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auto range_end(const T (&arr)[N]) -> const T* {
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return arr + N;
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}
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template <typename T, typename Enable = void>
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struct has_member_fn_begin_end_t : std::false_type {};
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template <typename T>
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struct has_member_fn_begin_end_t<T, void_t<decltype(std::declval<T>().begin()),
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decltype(std::declval<T>().end())>>
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: std::true_type {};
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// Member function overload
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template <typename T>
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auto range_begin(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).begin());
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template <typename T>
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auto range_end(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).end());
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// ADL overload. Only participates in overload resolution if member functions
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// are not found.
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template <typename T>
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auto range_begin(T&& rng)
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-> enable_if_t<!has_member_fn_begin_end_t<T&&>::value,
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decltype(begin(static_cast<T&&>(rng)))> {
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return begin(static_cast<T&&>(rng));
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}
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template <typename T>
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auto range_end(T&& rng) -> enable_if_t<!has_member_fn_begin_end_t<T&&>::value,
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decltype(end(static_cast<T&&>(rng)))> {
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return end(static_cast<T&&>(rng));
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}
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template <typename T, typename Enable = void>
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struct has_const_begin_end : std::false_type {};
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template <typename T, typename Enable = void>
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struct has_mutable_begin_end : std::false_type {};
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template <typename T>
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struct has_const_begin_end<
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T,
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void_t<
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decltype(detail::range_begin(std::declval<const remove_cvref_t<T>&>())),
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decltype(detail::range_end(std::declval<const remove_cvref_t<T>&>()))>>
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: std::true_type {};
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template <typename T>
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struct has_mutable_begin_end<
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T, void_t<decltype(detail::range_begin(std::declval<T>())),
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decltype(detail::range_end(std::declval<T>())),
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// the extra int here is because older versions of MSVC don't
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// SFINAE properly unless there are distinct types
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int>> : std::true_type {};
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template <typename T>
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struct is_range_<T, void>
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: std::integral_constant<bool, (has_const_begin_end<T>::value ||
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has_mutable_begin_end<T>::value)> {};
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# undef FMT_DECLTYPE_RETURN
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#endif
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// tuple_size and tuple_element check.
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template <typename T> class is_tuple_like_ {
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template <typename U>
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static auto check(U* p) -> decltype(std::tuple_size<U>::value, int());
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template <typename> static void check(...);
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public:
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static constexpr const bool value =
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!std::is_void<decltype(check<T>(nullptr))>::value;
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};
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// Check for integer_sequence
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#if defined(__cpp_lib_integer_sequence) || FMT_MSC_VERSION >= 1900
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template <typename T, T... N>
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using integer_sequence = std::integer_sequence<T, N...>;
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template <size_t... N> using index_sequence = std::index_sequence<N...>;
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template <size_t N> using make_index_sequence = std::make_index_sequence<N>;
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#else
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template <typename T, T... N> struct integer_sequence {
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using value_type = T;
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static FMT_CONSTEXPR auto size() -> size_t { return sizeof...(N); }
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};
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template <size_t... N> using index_sequence = integer_sequence<size_t, N...>;
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template <typename T, size_t N, T... Ns>
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struct make_integer_sequence : make_integer_sequence<T, N - 1, N - 1, Ns...> {};
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template <typename T, T... Ns>
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struct make_integer_sequence<T, 0, Ns...> : integer_sequence<T, Ns...> {};
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template <size_t N>
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using make_index_sequence = make_integer_sequence<size_t, N>;
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#endif
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template <typename T>
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using tuple_index_sequence = make_index_sequence<std::tuple_size<T>::value>;
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template <typename T, typename C, bool = is_tuple_like_<T>::value>
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class is_tuple_formattable_ {
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public:
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static constexpr const bool value = false;
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};
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template <typename T, typename C> class is_tuple_formattable_<T, C, true> {
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template <std::size_t... Is>
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static auto check2(index_sequence<Is...>,
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integer_sequence<bool, (Is == Is)...>) -> std::true_type;
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static auto check2(...) -> std::false_type;
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template <std::size_t... Is>
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static auto check(index_sequence<Is...>) -> decltype(check2(
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index_sequence<Is...>{},
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integer_sequence<bool,
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(is_formattable<typename std::tuple_element<Is, T>::type,
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C>::value)...>{}));
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public:
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static constexpr const bool value =
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decltype(check(tuple_index_sequence<T>{}))::value;
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};
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template <typename Tuple, typename F, size_t... Is>
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FMT_CONSTEXPR void for_each(index_sequence<Is...>, Tuple&& t, F&& f) {
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using std::get;
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// Using a free function get<Is>(Tuple) now.
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const int unused[] = {0, ((void)f(get<Is>(t)), 0)...};
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ignore_unused(unused);
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}
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template <typename Tuple, typename F>
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FMT_CONSTEXPR void for_each(Tuple&& t, F&& f) {
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for_each(tuple_index_sequence<remove_cvref_t<Tuple>>(),
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std::forward<Tuple>(t), std::forward<F>(f));
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}
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template <typename Tuple1, typename Tuple2, typename F, size_t... Is>
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void for_each2(index_sequence<Is...>, Tuple1&& t1, Tuple2&& t2, F&& f) {
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using std::get;
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const int unused[] = {0, ((void)f(get<Is>(t1), get<Is>(t2)), 0)...};
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ignore_unused(unused);
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}
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template <typename Tuple1, typename Tuple2, typename F>
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void for_each2(Tuple1&& t1, Tuple2&& t2, F&& f) {
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for_each2(tuple_index_sequence<remove_cvref_t<Tuple1>>(),
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std::forward<Tuple1>(t1), std::forward<Tuple2>(t2),
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std::forward<F>(f));
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}
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namespace tuple {
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// Workaround a bug in MSVC 2019 (v140).
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template <typename Char, typename... T>
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using result_t = std::tuple<formatter<remove_cvref_t<T>, Char>...>;
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using std::get;
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template <typename Tuple, typename Char, std::size_t... Is>
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auto get_formatters(index_sequence<Is...>)
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-> result_t<Char, decltype(get<Is>(std::declval<Tuple>()))...>;
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} // namespace tuple
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#if FMT_MSC_VERSION && FMT_MSC_VERSION < 1920
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// Older MSVC doesn't get the reference type correctly for arrays.
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template <typename R> struct range_reference_type_impl {
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using type = decltype(*detail::range_begin(std::declval<R&>()));
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};
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template <typename T, std::size_t N> struct range_reference_type_impl<T[N]> {
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using type = T&;
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};
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template <typename T>
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using range_reference_type = typename range_reference_type_impl<T>::type;
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#else
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template <typename Range>
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using range_reference_type =
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decltype(*detail::range_begin(std::declval<Range&>()));
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#endif
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// We don't use the Range's value_type for anything, but we do need the Range's
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// reference type, with cv-ref stripped.
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template <typename Range>
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using uncvref_type = remove_cvref_t<range_reference_type<Range>>;
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template <typename Formatter>
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FMT_CONSTEXPR auto maybe_set_debug_format(Formatter& f, bool set)
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-> decltype(f.set_debug_format(set)) {
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f.set_debug_format(set);
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}
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template <typename Formatter>
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FMT_CONSTEXPR void maybe_set_debug_format(Formatter&, ...) {}
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// These are not generic lambdas for compatibility with C++11.
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template <typename ParseContext> struct parse_empty_specs {
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template <typename Formatter> FMT_CONSTEXPR void operator()(Formatter& f) {
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f.parse(ctx);
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detail::maybe_set_debug_format(f, true);
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}
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ParseContext& ctx;
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};
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template <typename FormatContext> struct format_tuple_element {
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using char_type = typename FormatContext::char_type;
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template <typename T>
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void operator()(const formatter<T, char_type>& f, const T& v) {
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if (i > 0)
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ctx.advance_to(detail::copy_str<char_type>(separator, ctx.out()));
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ctx.advance_to(f.format(v, ctx));
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++i;
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}
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int i;
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FormatContext& ctx;
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basic_string_view<char_type> separator;
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};
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} // namespace detail
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template <typename T> struct is_tuple_like {
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static constexpr const bool value =
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detail::is_tuple_like_<T>::value && !detail::is_range_<T>::value;
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};
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template <typename T, typename C> struct is_tuple_formattable {
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static constexpr const bool value =
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detail::is_tuple_formattable_<T, C>::value;
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};
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template <typename Tuple, typename Char>
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struct formatter<Tuple, Char,
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enable_if_t<fmt::is_tuple_like<Tuple>::value &&
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fmt::is_tuple_formattable<Tuple, Char>::value>> {
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private:
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decltype(detail::tuple::get_formatters<Tuple, Char>(
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detail::tuple_index_sequence<Tuple>())) formatters_;
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basic_string_view<Char> separator_ = detail::string_literal<Char, ',', ' '>{};
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basic_string_view<Char> opening_bracket_ =
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detail::string_literal<Char, '('>{};
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basic_string_view<Char> closing_bracket_ =
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detail::string_literal<Char, ')'>{};
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public:
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FMT_CONSTEXPR formatter() {}
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FMT_CONSTEXPR void set_separator(basic_string_view<Char> sep) {
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separator_ = sep;
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}
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FMT_CONSTEXPR void set_brackets(basic_string_view<Char> open,
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basic_string_view<Char> close) {
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opening_bracket_ = open;
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closing_bracket_ = close;
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}
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template <typename ParseContext>
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FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
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auto it = ctx.begin();
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if (it != ctx.end() && *it != '}')
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FMT_THROW(format_error("invalid format specifier"));
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detail::for_each(formatters_, detail::parse_empty_specs<ParseContext>{ctx});
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return it;
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}
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template <typename FormatContext>
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auto format(const Tuple& value, FormatContext& ctx) const
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-> decltype(ctx.out()) {
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ctx.advance_to(detail::copy_str<Char>(opening_bracket_, ctx.out()));
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detail::for_each2(
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formatters_, value,
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detail::format_tuple_element<FormatContext>{0, ctx, separator_});
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return detail::copy_str<Char>(closing_bracket_, ctx.out());
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}
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};
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template <typename T, typename Char> struct is_range {
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static constexpr const bool value =
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detail::is_range_<T>::value && !detail::is_std_string_like<T>::value &&
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!std::is_convertible<T, std::basic_string<Char>>::value &&
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!std::is_convertible<T, detail::std_string_view<Char>>::value;
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};
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namespace detail {
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template <typename Context> struct range_mapper {
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using mapper = arg_mapper<Context>;
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template <typename T,
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FMT_ENABLE_IF(has_formatter<remove_cvref_t<T>, Context>::value)>
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static auto map(T&& value) -> T&& {
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return static_cast<T&&>(value);
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}
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template <typename T,
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FMT_ENABLE_IF(!has_formatter<remove_cvref_t<T>, Context>::value)>
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static auto map(T&& value)
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-> decltype(mapper().map(static_cast<T&&>(value))) {
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return mapper().map(static_cast<T&&>(value));
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}
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};
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template <typename Char, typename Element>
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using range_formatter_type =
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formatter<remove_cvref_t<decltype(range_mapper<buffer_context<Char>>{}.map(
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std::declval<Element>()))>,
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Char>;
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template <typename R>
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using maybe_const_range =
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conditional_t<has_const_begin_end<R>::value, const R, R>;
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// Workaround a bug in MSVC 2015 and earlier.
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#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1910
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template <typename R, typename Char>
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struct is_formattable_delayed
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: is_formattable<uncvref_type<maybe_const_range<R>>, Char> {};
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#endif
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} // namespace detail
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template <typename...> struct conjunction : std::true_type {};
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template <typename P> struct conjunction<P> : P {};
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template <typename P1, typename... Pn>
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struct conjunction<P1, Pn...>
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: conditional_t<bool(P1::value), conjunction<Pn...>, P1> {};
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template <typename T, typename Char, typename Enable = void>
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struct range_formatter;
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template <typename T, typename Char>
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struct range_formatter<
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T, Char,
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enable_if_t<conjunction<std::is_same<T, remove_cvref_t<T>>,
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is_formattable<T, Char>>::value>> {
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private:
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detail::range_formatter_type<Char, T> underlying_;
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basic_string_view<Char> separator_ = detail::string_literal<Char, ',', ' '>{};
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basic_string_view<Char> opening_bracket_ =
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detail::string_literal<Char, '['>{};
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basic_string_view<Char> closing_bracket_ =
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detail::string_literal<Char, ']'>{};
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public:
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FMT_CONSTEXPR range_formatter() {}
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FMT_CONSTEXPR auto underlying() -> detail::range_formatter_type<Char, T>& {
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return underlying_;
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}
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FMT_CONSTEXPR void set_separator(basic_string_view<Char> sep) {
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separator_ = sep;
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}
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FMT_CONSTEXPR void set_brackets(basic_string_view<Char> open,
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basic_string_view<Char> close) {
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opening_bracket_ = open;
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closing_bracket_ = close;
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}
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template <typename ParseContext>
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FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
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auto it = ctx.begin();
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auto end = ctx.end();
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if (it != end && *it == 'n') {
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set_brackets({}, {});
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++it;
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}
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if (it != end && *it != '}') {
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if (*it != ':') FMT_THROW(format_error("invalid format specifier"));
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++it;
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} else {
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detail::maybe_set_debug_format(underlying_, true);
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}
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ctx.advance_to(it);
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return underlying_.parse(ctx);
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}
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template <typename R, typename FormatContext>
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auto format(R&& range, FormatContext& ctx) const -> decltype(ctx.out()) {
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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);
|
|
auto&& item = *it;
|
|
out = underlying_.format(mapper.map(item), 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_
|
|
: std::integral_constant<range_format,
|
|
std::is_same<uncvref_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} {}
|
|
};
|
|
|
|
// 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;
|
|
}
|
|
};
|
|
|
|
namespace detail {
|
|
// Check if T has an interface like a container adaptor (e.g. std::stack,
|
|
// std::queue, std::priority_queue).
|
|
template <typename T> class is_container_adaptor_like {
|
|
template <typename U> static auto check(U* p) -> typename U::container_type;
|
|
template <typename> static void check(...);
|
|
|
|
public:
|
|
static constexpr const bool value =
|
|
!std::is_void<decltype(check<T>(nullptr))>::value;
|
|
};
|
|
|
|
template <typename Container> struct all {
|
|
const Container& c;
|
|
auto begin() const -> typename Container::const_iterator { return c.begin(); }
|
|
auto end() const -> typename Container::const_iterator { return c.end(); }
|
|
};
|
|
} // namespace detail
|
|
|
|
template <typename T, typename Char>
|
|
struct formatter<
|
|
T, Char,
|
|
enable_if_t<conjunction<detail::is_container_adaptor_like<T>,
|
|
bool_constant<range_format_kind<T, Char>::value ==
|
|
range_format::disabled>>::value>>
|
|
: formatter<detail::all<typename T::container_type>, Char> {
|
|
using all = detail::all<typename T::container_type>;
|
|
template <typename FormatContext>
|
|
auto format(const T& t, FormatContext& ctx) const -> decltype(ctx.out()) {
|
|
struct getter : T {
|
|
static auto get(const T& t) -> all {
|
|
return {t.*(&getter::c)}; // Access c through the derived class.
|
|
}
|
|
};
|
|
return formatter<all>::format(getter::get(t), ctx);
|
|
}
|
|
};
|
|
|
|
FMT_BEGIN_EXPORT
|
|
|
|
/**
|
|
\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_END_EXPORT
|
|
FMT_END_NAMESPACE
|
|
|
|
#endif // FMT_RANGES_H_
|