/* * Copyright (c) Atmosphère-NX * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #pragma once #include <vapours/common.hpp> #include <vapours/assert.hpp> namespace ams::util { template<typename T> class IFunction; namespace impl { template<typename> struct GetIFunctionTypeForObject; template<typename F, typename R, typename... Args> struct GetIFunctionTypeForObject<R (F::*)(Args...)> { using Type = R(Args...); }; template<typename F, typename R, typename... Args> struct GetIFunctionTypeForObject<R (F::*)(Args...) const> { using Type = R(Args...); }; template<typename> struct GetIFunctionType; template<typename R, typename... Args> struct GetIFunctionType<R(Args...)> { using Type = R(Args...); }; template<typename R, typename... Args> struct GetIFunctionType<R(*)(Args...)> : public GetIFunctionType<R(Args...)>{}; template<typename F> struct GetIFunctionType<std::reference_wrapper<F>> : public GetIFunctionType<F>{}; template<typename F> struct GetIFunctionType : public GetIFunctionTypeForObject<decltype(&F::operator())>{}; template<typename T, typename F, typename Enabled = void> class Function; template<typename R, typename... Args, typename F> class Function<R(Args...), F, typename std::enable_if<!(std::is_class<F>::value && !std::is_final<F>::value)>::type> final : public IFunction<R(Args...)> { private: F m_f; public: constexpr explicit Function(F f) : m_f(std::move(f)) { /* ... */} constexpr virtual ~Function() override { /* ... */ } constexpr virtual R operator()(Args... args) const override final { return m_f(std::forward<Args>(args)...); } }; template<typename R, typename... Args, typename F> class Function<R(Args...), F, typename std::enable_if<std::is_class<F>::value && !std::is_final<F>::value>::type> final : public IFunction<R(Args...)>, private F { public: constexpr explicit Function(F f) : F(std::move(f)) { /* ... */} constexpr virtual ~Function() override { /* ... */ } constexpr virtual R operator()(Args... args) const override final { return static_cast<const F &>(*this).operator()(std::forward<Args>(args)...); } }; template<typename I, typename F> constexpr ALWAYS_INLINE auto MakeIFunctionExplicitly(F f) { using FunctionType = ::ams::util::impl::Function<I, typename std::decay<F>::type>; return FunctionType{ std::move(f) }; } template<typename I, typename T, typename R> constexpr ALWAYS_INLINE auto MakeIFunctionExplicitly(R T::*f) { return MakeIFunctionExplicitly<I>(std::mem_fn(f)); } } template<typename R, typename... Args> class IFunction<R(Args...)> { protected: constexpr virtual ~IFunction() { /* ... */ }; public: constexpr virtual R operator()(Args... args) const = 0; template<typename F> static constexpr ALWAYS_INLINE auto Make(F f) { return ::ams::util::impl::MakeIFunctionExplicitly<R(Args...)>(std::move(f)); } }; template<typename F, typename = typename std::enable_if<!std::is_member_pointer<F>::value>::type> constexpr ALWAYS_INLINE auto MakeIFunction(F f) { static_assert(!std::is_member_pointer<F>::value); return IFunction<typename ::ams::util::impl::GetIFunctionType<typename std::decay<F>::type>::Type>::Make(std::move(f)); } }