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+// Formatting library for C++ - experimental format string compilation
+//
+// Copyright (c) 2012 - present, Victor Zverovich and fmt contributors
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_COMPILE_H_
+#define FMT_COMPILE_H_
+
+#include <vector>
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+// A compile-time string which is compiled into fast formatting code.
+class compiled_string {};
+
+template <typename S>
+struct is_compiled_string : std::is_base_of<compiled_string, S> {};
+
+/**
+ \rst
+ Converts a string literal *s* into a format string that will be parsed at
+ compile time and converted into efficient formatting code. Requires C++17
+ ``constexpr if`` compiler support.
+
+ **Example**::
+
+ // Converts 42 into std::string using the most efficient method and no
+ // runtime format string processing.
+ std::string s = fmt::format(FMT_COMPILE("{}"), 42);
+ \endrst
+ */
+#define FMT_COMPILE(s) FMT_STRING_IMPL(s, fmt::detail::compiled_string)
+
+template <typename T, typename... Tail>
+const T& first(const T& value, const Tail&...) {
+ return value;
+}
+
+// Part of a compiled format string. It can be either literal text or a
+// replacement field.
+template <typename Char> struct format_part {
+ enum class kind { arg_index, arg_name, text, replacement };
+
+ struct replacement {
+ arg_ref<Char> arg_id;
+ dynamic_format_specs<Char> specs;
+ };
+
+ kind part_kind;
+ union value {
+ int arg_index;
+ basic_string_view<Char> str;
+ replacement repl;
+
+ FMT_CONSTEXPR value(int index = 0) : arg_index(index) {}
+ FMT_CONSTEXPR value(basic_string_view<Char> s) : str(s) {}
+ FMT_CONSTEXPR value(replacement r) : repl(r) {}
+ } val;
+ // Position past the end of the argument id.
+ const Char* arg_id_end = nullptr;
+
+ FMT_CONSTEXPR format_part(kind k = kind::arg_index, value v = {})
+ : part_kind(k), val(v) {}
+
+ static FMT_CONSTEXPR format_part make_arg_index(int index) {
+ return format_part(kind::arg_index, index);
+ }
+ static FMT_CONSTEXPR format_part make_arg_name(basic_string_view<Char> name) {
+ return format_part(kind::arg_name, name);
+ }
+ static FMT_CONSTEXPR format_part make_text(basic_string_view<Char> text) {
+ return format_part(kind::text, text);
+ }
+ static FMT_CONSTEXPR format_part make_replacement(replacement repl) {
+ return format_part(kind::replacement, repl);
+ }
+};
+
+template <typename Char> struct part_counter {
+ unsigned num_parts = 0;
+
+ FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) {
+ if (begin != end) ++num_parts;
+ }
+
+ FMT_CONSTEXPR int on_arg_id() { return ++num_parts, 0; }
+ FMT_CONSTEXPR int on_arg_id(int) { return ++num_parts, 0; }
+ FMT_CONSTEXPR int on_arg_id(basic_string_view<Char>) {
+ return ++num_parts, 0;
+ }
+
+ FMT_CONSTEXPR void on_replacement_field(int, const Char*) {}
+
+ FMT_CONSTEXPR const Char* on_format_specs(int, const Char* begin,
+ const Char* end) {
+ // Find the matching brace.
+ unsigned brace_counter = 0;
+ for (; begin != end; ++begin) {
+ if (*begin == '{') {
+ ++brace_counter;
+ } else if (*begin == '}') {
+ if (brace_counter == 0u) break;
+ --brace_counter;
+ }
+ }
+ return begin;
+ }
+
+ FMT_CONSTEXPR void on_error(const char*) {}
+};
+
+// Counts the number of parts in a format string.
+template <typename Char>
+FMT_CONSTEXPR unsigned count_parts(basic_string_view<Char> format_str) {
+ part_counter<Char> counter;
+ parse_format_string<true>(format_str, counter);
+ return counter.num_parts;
+}
+
+template <typename Char, typename PartHandler>
+class format_string_compiler : public error_handler {
+ private:
+ using part = format_part<Char>;
+
+ PartHandler handler_;
+ part part_;
+ basic_string_view<Char> format_str_;
+ basic_format_parse_context<Char> parse_context_;
+
+ public:
+ FMT_CONSTEXPR format_string_compiler(basic_string_view<Char> format_str,
+ PartHandler handler)
+ : handler_(handler),
+ format_str_(format_str),
+ parse_context_(format_str) {}
+
+ FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) {
+ if (begin != end)
+ handler_(part::make_text({begin, to_unsigned(end - begin)}));
+ }
+
+ FMT_CONSTEXPR int on_arg_id() {
+ part_ = part::make_arg_index(parse_context_.next_arg_id());
+ return 0;
+ }
+
+ FMT_CONSTEXPR int on_arg_id(int id) {
+ parse_context_.check_arg_id(id);
+ part_ = part::make_arg_index(id);
+ return 0;
+ }
+
+ FMT_CONSTEXPR int on_arg_id(basic_string_view<Char> id) {
+ part_ = part::make_arg_name(id);
+ return 0;
+ }
+
+ FMT_CONSTEXPR void on_replacement_field(int, const Char* ptr) {
+ part_.arg_id_end = ptr;
+ handler_(part_);
+ }
+
+ FMT_CONSTEXPR const Char* on_format_specs(int, const Char* begin,
+ const Char* end) {
+ auto repl = typename part::replacement();
+ dynamic_specs_handler<basic_format_parse_context<Char>> handler(
+ repl.specs, parse_context_);
+ auto it = parse_format_specs(begin, end, handler);
+ if (*it != '}') on_error("missing '}' in format string");
+ repl.arg_id = part_.part_kind == part::kind::arg_index
+ ? arg_ref<Char>(part_.val.arg_index)
+ : arg_ref<Char>(part_.val.str);
+ auto part = part::make_replacement(repl);
+ part.arg_id_end = begin;
+ handler_(part);
+ return it;
+ }
+};
+
+// Compiles a format string and invokes handler(part) for each parsed part.
+template <bool IS_CONSTEXPR, typename Char, typename PartHandler>
+FMT_CONSTEXPR void compile_format_string(basic_string_view<Char> format_str,
+ PartHandler handler) {
+ parse_format_string<IS_CONSTEXPR>(
+ format_str,
+ format_string_compiler<Char, PartHandler>(format_str, handler));
+}
+
+template <typename OutputIt, typename Context, typename Id>
+void format_arg(
+ basic_format_parse_context<typename Context::char_type>& parse_ctx,
+ Context& ctx, Id arg_id) {
+ ctx.advance_to(visit_format_arg(
+ arg_formatter<OutputIt, typename Context::char_type>(ctx, &parse_ctx),
+ ctx.arg(arg_id)));
+}
+
+// vformat_to is defined in a subnamespace to prevent ADL.
+namespace cf {
+template <typename Context, typename OutputIt, typename CompiledFormat>
+auto vformat_to(OutputIt out, CompiledFormat& cf,
+ basic_format_args<Context> args) -> typename Context::iterator {
+ using char_type = typename Context::char_type;
+ basic_format_parse_context<char_type> parse_ctx(
+ to_string_view(cf.format_str_));
+ Context ctx(out, args);
+
+ const auto& parts = cf.parts();
+ for (auto part_it = std::begin(parts); part_it != std::end(parts);
+ ++part_it) {
+ const auto& part = *part_it;
+ const auto& value = part.val;
+
+ using format_part_t = format_part<char_type>;
+ switch (part.part_kind) {
+ case format_part_t::kind::text: {
+ const auto text = value.str;
+ auto output = ctx.out();
+ auto&& it = reserve(output, text.size());
+ it = std::copy_n(text.begin(), text.size(), it);
+ ctx.advance_to(output);
+ break;
+ }
+
+ case format_part_t::kind::arg_index:
+ advance_to(parse_ctx, part.arg_id_end);
+ detail::format_arg<OutputIt>(parse_ctx, ctx, value.arg_index);
+ break;
+
+ case format_part_t::kind::arg_name:
+ advance_to(parse_ctx, part.arg_id_end);
+ detail::format_arg<OutputIt>(parse_ctx, ctx, value.str);
+ break;
+
+ case format_part_t::kind::replacement: {
+ const auto& arg_id_value = value.repl.arg_id.val;
+ const auto arg = value.repl.arg_id.kind == arg_id_kind::index
+ ? ctx.arg(arg_id_value.index)
+ : ctx.arg(arg_id_value.name);
+
+ auto specs = value.repl.specs;
+
+ handle_dynamic_spec<width_checker>(specs.width, specs.width_ref, ctx);
+ handle_dynamic_spec<precision_checker>(specs.precision,
+ specs.precision_ref, ctx);
+
+ error_handler h;
+ numeric_specs_checker<error_handler> checker(h, arg.type());
+ if (specs.align == align::numeric) checker.require_numeric_argument();
+ if (specs.sign != sign::none) checker.check_sign();
+ if (specs.alt) checker.require_numeric_argument();
+ if (specs.precision >= 0) checker.check_precision();
+
+ advance_to(parse_ctx, part.arg_id_end);
+ ctx.advance_to(
+ visit_format_arg(arg_formatter<OutputIt, typename Context::char_type>(
+ ctx, nullptr, &specs),
+ arg));
+ break;
+ }
+ }
+ }
+ return ctx.out();
+}
+} // namespace cf
+
+struct basic_compiled_format {};
+
+template <typename S, typename = void>
+struct compiled_format_base : basic_compiled_format {
+ using char_type = char_t<S>;
+ using parts_container = std::vector<detail::format_part<char_type>>;
+
+ parts_container compiled_parts;
+
+ explicit compiled_format_base(basic_string_view<char_type> format_str) {
+ compile_format_string<false>(format_str,
+ [this](const format_part<char_type>& part) {
+ compiled_parts.push_back(part);
+ });
+ }
+
+ const parts_container& parts() const { return compiled_parts; }
+};
+
+template <typename Char, unsigned N> struct format_part_array {
+ format_part<Char> data[N] = {};
+ FMT_CONSTEXPR format_part_array() = default;
+};
+
+template <typename Char, unsigned N>
+FMT_CONSTEXPR format_part_array<Char, N> compile_to_parts(
+ basic_string_view<Char> format_str) {
+ format_part_array<Char, N> parts;
+ unsigned counter = 0;
+ // This is not a lambda for compatibility with older compilers.
+ struct {
+ format_part<Char>* parts;
+ unsigned* counter;
+ FMT_CONSTEXPR void operator()(const format_part<Char>& part) {
+ parts[(*counter)++] = part;
+ }
+ } collector{parts.data, &counter};
+ compile_format_string<true>(format_str, collector);
+ if (counter < N) {
+ parts.data[counter] =
+ format_part<Char>::make_text(basic_string_view<Char>());
+ }
+ return parts;
+}
+
+template <typename T> constexpr const T& constexpr_max(const T& a, const T& b) {
+ return (a < b) ? b : a;
+}
+
+template <typename S>
+struct compiled_format_base<S, enable_if_t<is_compile_string<S>::value>>
+ : basic_compiled_format {
+ using char_type = char_t<S>;
+
+ FMT_CONSTEXPR explicit compiled_format_base(basic_string_view<char_type>) {}
+
+// Workaround for old compilers. Format string compilation will not be
+// performed there anyway.
+#if FMT_USE_CONSTEXPR
+ static FMT_CONSTEXPR_DECL const unsigned num_format_parts =
+ constexpr_max(count_parts(to_string_view(S())), 1u);
+#else
+ static const unsigned num_format_parts = 1;
+#endif
+
+ using parts_container = format_part<char_type>[num_format_parts];
+
+ const parts_container& parts() const {
+ static FMT_CONSTEXPR_DECL const auto compiled_parts =
+ compile_to_parts<char_type, num_format_parts>(
+ detail::to_string_view(S()));
+ return compiled_parts.data;
+ }
+};
+
+template <typename S, typename... Args>
+class compiled_format : private compiled_format_base<S> {
+ public:
+ using typename compiled_format_base<S>::char_type;
+
+ private:
+ basic_string_view<char_type> format_str_;
+
+ template <typename Context, typename OutputIt, typename CompiledFormat>
+ friend auto cf::vformat_to(OutputIt out, CompiledFormat& cf,
+ basic_format_args<Context> args) ->
+ typename Context::iterator;
+
+ public:
+ compiled_format() = delete;
+ explicit constexpr compiled_format(basic_string_view<char_type> format_str)
+ : compiled_format_base<S>(format_str), format_str_(format_str) {}
+};
+
+#ifdef __cpp_if_constexpr
+template <typename... Args> struct type_list {};
+
+// Returns a reference to the argument at index N from [first, rest...].
+template <int N, typename T, typename... Args>
+constexpr const auto& get([[maybe_unused]] const T& first,
+ [[maybe_unused]] const Args&... rest) {
+ static_assert(N < 1 + sizeof...(Args), "index is out of bounds");
+ if constexpr (N == 0)
+ return first;
+ else
+ return get<N - 1>(rest...);
+}
+
+template <int N, typename> struct get_type_impl;
+
+template <int N, typename... Args> struct get_type_impl<N, type_list<Args...>> {
+ using type = remove_cvref_t<decltype(get<N>(std::declval<Args>()...))>;
+};
+
+template <int N, typename T>
+using get_type = typename get_type_impl<N, T>::type;
+
+template <typename T> struct is_compiled_format : std::false_type {};
+
+template <typename Char> struct text {
+ basic_string_view<Char> data;
+ using char_type = Char;
+
+ template <typename OutputIt, typename... Args>
+ OutputIt format(OutputIt out, const Args&...) const {
+ return write<Char>(out, data);
+ }
+};
+
+template <typename Char>
+struct is_compiled_format<text<Char>> : std::true_type {};
+
+template <typename Char>
+constexpr text<Char> make_text(basic_string_view<Char> s, size_t pos,
+ size_t size) {
+ return {{&s[pos], size}};
+}
+
+template <typename Char> struct code_unit {
+ Char value;
+ using char_type = Char;
+
+ template <typename OutputIt, typename... Args>
+ OutputIt format(OutputIt out, const Args&...) const {
+ return write<Char>(out, value);
+ }
+};
+
+template <typename Char>
+struct is_compiled_format<code_unit<Char>> : std::true_type {};
+
+// A replacement field that refers to argument N.
+template <typename Char, typename T, int N> struct field {
+ using char_type = Char;
+
+ template <typename OutputIt, typename... Args>
+ OutputIt format(OutputIt out, const Args&... args) const {
+ // This ensures that the argument type is convertile to `const T&`.
+ const T& arg = get<N>(args...);
+ return write<Char>(out, arg);
+ }
+};
+
+template <typename Char, typename T, int N>
+struct is_compiled_format<field<Char, T, N>> : std::true_type {};
+
+// A replacement field that refers to argument N and has format specifiers.
+template <typename Char, typename T, int N> struct spec_field {
+ using char_type = Char;
+ mutable formatter<T, Char> fmt;
+
+ template <typename OutputIt, typename... Args>
+ OutputIt format(OutputIt out, const Args&... args) const {
+ // This ensures that the argument type is convertile to `const T&`.
+ const T& arg = get<N>(args...);
+ const auto& vargs =
+ make_format_args<basic_format_context<OutputIt, Char>>(args...);
+ basic_format_context<OutputIt, Char> ctx(out, vargs);
+ return fmt.format(arg, ctx);
+ }
+};
+
+template <typename Char, typename T, int N>
+struct is_compiled_format<spec_field<Char, T, N>> : std::true_type {};
+
+template <typename L, typename R> struct concat {
+ L lhs;
+ R rhs;
+ using char_type = typename L::char_type;
+
+ template <typename OutputIt, typename... Args>
+ OutputIt format(OutputIt out, const Args&... args) const {
+ out = lhs.format(out, args...);
+ return rhs.format(out, args...);
+ }
+};
+
+template <typename L, typename R>
+struct is_compiled_format<concat<L, R>> : std::true_type {};
+
+template <typename L, typename R>
+constexpr concat<L, R> make_concat(L lhs, R rhs) {
+ return {lhs, rhs};
+}
+
+struct unknown_format {};
+
+template <typename Char>
+constexpr size_t parse_text(basic_string_view<Char> str, size_t pos) {
+ for (size_t size = str.size(); pos != size; ++pos) {
+ if (str[pos] == '{' || str[pos] == '}') break;
+ }
+ return pos;
+}
+
+template <typename Args, size_t POS, int ID, typename S>
+constexpr auto compile_format_string(S format_str);
+
+template <typename Args, size_t POS, int ID, typename T, typename S>
+constexpr auto parse_tail(T head, S format_str) {
+ if constexpr (POS !=
+ basic_string_view<typename S::char_type>(format_str).size()) {
+ constexpr auto tail = compile_format_string<Args, POS, ID>(format_str);
+ if constexpr (std::is_same<remove_cvref_t<decltype(tail)>,
+ unknown_format>())
+ return tail;
+ else
+ return make_concat(head, tail);
+ } else {
+ return head;
+ }
+}
+
+template <typename T, typename Char> struct parse_specs_result {
+ formatter<T, Char> fmt;
+ size_t end;
+ int next_arg_id;
+};
+
+template <typename T, typename Char>
+constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
+ size_t pos, int arg_id) {
+ str.remove_prefix(pos);
+ auto ctx = basic_format_parse_context<Char>(str, {}, arg_id + 1);
+ auto f = formatter<T, Char>();
+ auto end = f.parse(ctx);
+ return {f, pos + (end - str.data()) + 1, ctx.next_arg_id()};
+}
+
+// Compiles a non-empty format string and returns the compiled representation
+// or unknown_format() on unrecognized input.
+template <typename Args, size_t POS, int ID, typename S>
+constexpr auto compile_format_string(S format_str) {
+ using char_type = typename S::char_type;
+ constexpr basic_string_view<char_type> str = format_str;
+ if constexpr (str[POS] == '{') {
+ if (POS + 1 == str.size())
+ throw format_error("unmatched '{' in format string");
+ if constexpr (str[POS + 1] == '{') {
+ return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
+ } else if constexpr (str[POS + 1] == '}') {
+ using type = get_type<ID, Args>;
+ return parse_tail<Args, POS + 2, ID + 1>(field<char_type, type, ID>(),
+ format_str);
+ } else if constexpr (str[POS + 1] == ':') {
+ using type = get_type<ID, Args>;
+ constexpr auto result = parse_specs<type>(str, POS + 2, ID);
+ return parse_tail<Args, result.end, result.next_arg_id>(
+ spec_field<char_type, type, ID>{result.fmt}, format_str);
+ } else {
+ return unknown_format();
+ }
+ } else if constexpr (str[POS] == '}') {
+ if (POS + 1 == str.size())
+ throw format_error("unmatched '}' in format string");
+ return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
+ } else {
+ constexpr auto end = parse_text(str, POS + 1);
+ if constexpr (end - POS > 1) {
+ return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
+ format_str);
+ } else {
+ return parse_tail<Args, end, ID>(code_unit<char_type>{str[POS]},
+ format_str);
+ }
+ }
+}
+
+template <typename... Args, typename S,
+ FMT_ENABLE_IF(is_compile_string<S>::value ||
+ detail::is_compiled_string<S>::value)>
+constexpr auto compile(S format_str) {
+ constexpr basic_string_view<typename S::char_type> str = format_str;
+ if constexpr (str.size() == 0) {
+ return detail::make_text(str, 0, 0);
+ } else {
+ constexpr auto result =
+ detail::compile_format_string<detail::type_list<Args...>, 0, 0>(
+ format_str);
+ if constexpr (std::is_same<remove_cvref_t<decltype(result)>,
+ detail::unknown_format>()) {
+ return detail::compiled_format<S, Args...>(to_string_view(format_str));
+ } else {
+ return result;
+ }
+ }
+}
+#else
+template <typename... Args, typename S,
+ FMT_ENABLE_IF(is_compile_string<S>::value)>
+constexpr auto compile(S format_str) -> detail::compiled_format<S, Args...> {
+ return detail::compiled_format<S, Args...>(to_string_view(format_str));
+}
+#endif // __cpp_if_constexpr
+
+// Compiles the format string which must be a string literal.
+template <typename... Args, typename Char, size_t N>
+auto compile(const Char (&format_str)[N])
+ -> detail::compiled_format<const Char*, Args...> {
+ return detail::compiled_format<const Char*, Args...>(
+ basic_string_view<Char>(format_str, N - 1));
+}
+} // namespace detail
+
+// DEPRECATED! use FMT_COMPILE instead.
+template <typename... Args>
+FMT_DEPRECATED auto compile(const Args&... args)
+ -> decltype(detail::compile(args...)) {
+ return detail::compile(args...);
+}
+
+#if FMT_USE_CONSTEXPR
+# ifdef __cpp_if_constexpr
+
+template <typename CompiledFormat, typename... Args,
+ typename Char = typename CompiledFormat::char_type,
+ FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
+FMT_INLINE std::basic_string<Char> format(const CompiledFormat& cf,
+ const Args&... args) {
+ basic_memory_buffer<Char> buffer;
+ cf.format(detail::buffer_appender<Char>(buffer), args...);
+ return to_string(buffer);
+}
+
+template <typename OutputIt, typename CompiledFormat, typename... Args,
+ FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
+OutputIt format_to(OutputIt out, const CompiledFormat& cf,
+ const Args&... args) {
+ return cf.format(out, args...);
+}
+# endif // __cpp_if_constexpr
+#endif // FMT_USE_CONSTEXPR
+
+template <typename CompiledFormat, typename... Args,
+ typename Char = typename CompiledFormat::char_type,
+ FMT_ENABLE_IF(std::is_base_of<detail::basic_compiled_format,
+ CompiledFormat>::value)>
+std::basic_string<Char> format(const CompiledFormat& cf, const Args&... args) {
+ basic_memory_buffer<Char> buffer;
+ using context = buffer_context<Char>;
+ detail::cf::vformat_to<context>(detail::buffer_appender<Char>(buffer), cf,
+ make_format_args<context>(args...));
+ return to_string(buffer);
+}
+
+template <typename S, typename... Args,
+ FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
+FMT_INLINE std::basic_string<typename S::char_type> format(const S&,
+ Args&&... args) {
+#ifdef __cpp_if_constexpr
+ if constexpr (std::is_same<typename S::char_type, char>::value) {
+ constexpr basic_string_view<typename S::char_type> str = S();
+ if (str.size() == 2 && str[0] == '{' && str[1] == '}')
+ return fmt::to_string(detail::first(args...));
+ }
+#endif
+ constexpr auto compiled = detail::compile<Args...>(S());
+ return format(compiled, std::forward<Args>(args)...);
+}
+
+template <typename OutputIt, typename CompiledFormat, typename... Args,
+ FMT_ENABLE_IF(std::is_base_of<detail::basic_compiled_format,
+ CompiledFormat>::value)>
+OutputIt format_to(OutputIt out, const CompiledFormat& cf,
+ const Args&... args) {
+ using char_type = typename CompiledFormat::char_type;
+ using context = format_context_t<OutputIt, char_type>;
+ return detail::cf::vformat_to<context>(out, cf,
+ make_format_args<context>(args...));
+}
+
+template <typename OutputIt, typename S, typename... Args,
+ FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
+OutputIt format_to(OutputIt out, const S&, const Args&... args) {
+ constexpr auto compiled = detail::compile<Args...>(S());
+ return format_to(out, compiled, args...);
+}
+
+template <typename OutputIt, typename CompiledFormat, typename... Args>
+auto format_to_n(OutputIt out, size_t n, const CompiledFormat& cf,
+ const Args&... args) ->
+ typename std::enable_if<
+ detail::is_output_iterator<OutputIt,
+ typename CompiledFormat::char_type>::value &&
+ std::is_base_of<detail::basic_compiled_format,
+ CompiledFormat>::value,
+ format_to_n_result<OutputIt>>::type {
+ auto it =
+ format_to(detail::truncating_iterator<OutputIt>(out, n), cf, args...);
+ return {it.base(), it.count()};
+}
+
+template <typename OutputIt, typename S, typename... Args,
+ FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
+format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n, const S&,
+ const Args&... args) {
+ constexpr auto compiled = detail::compile<Args...>(S());
+ auto it = format_to(detail::truncating_iterator<OutputIt>(out, n), compiled,
+ args...);
+ return {it.base(), it.count()};
+}
+
+template <typename CompiledFormat, typename... Args>
+size_t formatted_size(const CompiledFormat& cf, const Args&... args) {
+ return format_to(detail::counting_iterator(), cf, args...).count();
+}
+
+FMT_END_NAMESPACE
+
+#endif // FMT_COMPILE_H_