58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#pragma once
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#include "move.hpp"
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#include "type_traits.hpp"
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#include <format>
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#include <string_view>
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namespace util {
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template <typename... Ts>
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inline constexpr auto format(std::string_view fmt, Ts&&... args)
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-> std::string {
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#if defined(__cpp_if_consteval) && defined(doesnt_work_yet_in_clang_14)
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if
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consteval { return std::format(fmt, args...); }
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else {
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return std::vformat(fmt, std::make_format_args(std::forward<Ts>(args)...));
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}
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#else
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return std::vformat(fmt, std::make_format_args(std::forward<Ts>(args)...));
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#endif
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}
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template <typename T, typename Context>
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using has_formatter =
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std::is_constructible<typename Context::template formatter_type<T>>;
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template <typename T>
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using is_formattable = has_formatter<T, std::format_context>;
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template <typename T>
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inline constexpr bool is_formattable_v = is_formattable<T>::value;
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template <typename T>
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concept formattable = is_formattable_v<T>;
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} // namespace util
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#include <optional>
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template<util::formattable F>
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struct std::formatter<std::optional<F>> : public std::formatter<F> {
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template <typename FormatContext>
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auto format(const std::optional<F>& option, FormatContext& ctx)
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-> decltype(ctx.out()) {
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auto fmt = ctx.out();
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if (option.has_value()) {
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fmt = std::format_to(fmt, "Some(");
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ctx.advance_to(fmt);
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fmt = std::formatter<F>::format(option.value(), ctx);
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*fmt++ = ')';
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} else {
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fmt = std::format_to(fmt, "None");
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}
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return fmt;
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}
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}; |