135 lines
3.8 KiB
C++
135 lines
3.8 KiB
C++
#pragma once
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#include <chrono>
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#include <format>
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#include <ranges>
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namespace mcc::traits
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{
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template <typename R>
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concept mcc_char_view = std::ranges::view<R> && std::same_as<std::ranges::range_value_t<R>, char>;
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// input range of char/const char
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template <typename R, typename CharT = char>
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concept mcc_input_char_range =
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std::ranges::input_range<R> && std::is_same_v<std::remove_cv_t<std::ranges::range_value_t<R>>, CharT>;
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// output range of char/const char
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template <typename R, typename CharT = char>
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concept mcc_output_char_range =
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std::ranges::output_range<R, CharT> && std::same_as<std::remove_cv_t<std::ranges::range_value_t<R>>, CharT>;
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template <typename R>
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concept mcc_view_or_output_char_range = mcc_char_view<R> || mcc_output_char_range<R>;
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template <typename R>
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concept mcc_range_of_input_char_range =
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std::ranges::range<R> && traits::mcc_input_char_range<std::ranges::range_value_t<R>>;
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template <typename R>
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concept mcc_range_of_output_char_range =
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std::ranges::range<R> && traits::mcc_output_char_range<std::ranges::range_value_t<R>>;
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// https://stackoverflow.com/questions/72430369/how-to-check-that-a-type-is-formattable-using-type-traits-concepts)
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template <typename T>
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concept mcc_formattable =
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requires(T v, std::format_context ctx) { std::formatter<std::remove_cvref_t<T>>().format(v, ctx); };
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// from https://stackoverflow.com/questions/74383254/concept-that-models-only-the-stdchrono-duration-types
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template <typename T>
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concept mcc_time_duration_c = requires {
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[]<class Rep, class Period>(std::type_identity<std::chrono::duration<Rep, Period>>) {
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}(std::type_identity<std::remove_cvref_t<T>>());
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};
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template <typename T>
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concept mcc_systime_c = requires {
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[]<class DT>(std::type_identity<std::chrono::sys_time<DT>>) {}(std::type_identity<std::remove_cvref_t<T>>());
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};
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/* a callable concept and its signature traits */
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template <typename T>
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concept mcc_is_callable = std::is_function_v<T> || (std::is_object_v<T> && requires(T) { &T::operator(); });
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// helper classes for callable signature deducing
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template <typename... Ts>
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struct mcc_func_traits_helper_t;
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template <typename R>
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struct mcc_func_traits_helper_t<R> {
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using ret_t = R;
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using args_t = std::tuple<>;
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using arg1_t = void;
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static constexpr size_t arity = 0;
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};
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template <typename R, typename Arg, typename... Args>
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struct mcc_func_traits_helper_t<R, Arg, Args...> {
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using ret_t = R;
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using args_t = std::tuple<Arg, Args...>;
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using arg1_t = Arg;
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static constexpr size_t arity = sizeof...(Args) + 1;
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};
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template <typename F>
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struct mcc_func_traits {
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// use of an empty struct here to match std::invoke_result behaivior (at least of GCC)
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};
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template <typename R, typename... Args>
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struct mcc_func_traits<R (*)(Args...)> : mcc_func_traits_helper_t<R, Args...> {
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};
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template <typename R, typename... Args>
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struct mcc_func_traits<R(Args...)> : mcc_func_traits_helper_t<R, Args...> {
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};
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template <typename C, typename R, typename... Args>
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struct mcc_func_traits<R (C::*)(Args...)> : mcc_func_traits_helper_t<R, Args...> {
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};
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template <typename C, typename R, typename... Args>
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struct mcc_func_traits<R (C::*)(Args...) const> : mcc_func_traits_helper_t<R, Args...> {
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};
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template <typename F>
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requires mcc_is_callable<F>
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struct mcc_func_traits<F> : mcc_func_traits<decltype(&F::operator())> {
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};
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// reference/const ref and rvalue helpers
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template <typename F>
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struct mcc_func_traits<F&> : mcc_func_traits<F> {
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};
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template <typename F>
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struct mcc_func_traits<const F&> : mcc_func_traits<F> {
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};
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template <typename F>
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struct mcc_func_traits<F&&> : mcc_func_traits<F> {
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};
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template <typename T>
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using mcc_retval_t = typename mcc_func_traits<T>::ret_t;
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template <typename T>
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using mcc_func_arg1_t = typename mcc_func_traits<T>::arg1_t;
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} // namespace mcc::traits
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