Atmosphere/libraries/libvapours/include/vapours/util/util_i_function.hpp

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/*
* 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 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 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() = default;
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 = 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));
}
}