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