84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
#pragma once
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#include <tuple>
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#include <type_traits>
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/*
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ABSTRACT DEVICE COMPONENTS LIBRARY
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*/
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namespace adc::traits
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{
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// deduce returned type of callable
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template <typename T>
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using adc_retval_t = std::invoke_result_t<std::remove_cvref_t<T>>;
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// helper classes
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template <typename... Ts>
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struct adc_func_traits_helper_t;
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template <typename R>
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struct adc_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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};
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template <typename R, typename Arg, typename... Args>
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struct adc_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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};
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// callable traits
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template <typename F>
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struct adc_func_traits;
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template <typename R, typename... Args>
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struct adc_func_traits<R (*)(Args...)> : adc_func_traits_helper_t<R, Args...> {
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};
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template <typename R, typename... Args>
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struct adc_func_traits<R(Args...)> : adc_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 adc_func_traits<R (C::*)(Args...)> : adc_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 adc_func_traits<R (C::*)(Args...) const> : adc_func_traits_helper_t<R, Args...> {
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};
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template <typename F>
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struct adc_func_traits : adc_func_traits<decltype(&F::operator())> {
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};
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// deduce type
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template <typename T>
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using adc_deduced_type =
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std::conditional_t<std::is_lvalue_reference_v<T> && !std::is_const_v<std::remove_reference_t<T>>,
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T,
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std::remove_cvref_t<T>>;
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// perfect-forwarding wrapper
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template <typename T, typename... Ts>
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auto adc_pf_wrapper(T&& v, Ts&&... vs)
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{
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return std::tuple<adc_deduced_type<T>, adc_deduced_type<Ts>...>(std::forward<T>(v), std::forward<Ts>(vs)...);
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}
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} // namespace adc::traits
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