63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include <utility>
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namespace Common {
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/// General purpose function wrapper similar to std::function.
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/// Unlike std::function, the captured values don't have to be copyable.
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/// This class can be moved but not copied.
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template <typename ResultType, typename... Args>
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class UniqueFunction {
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class CallableBase {
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public:
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virtual ~CallableBase() = default;
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virtual ResultType operator()(Args&&...) = 0;
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};
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template <typename Functor>
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class Callable final : public CallableBase {
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public:
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Callable(Functor&& functor_) : functor{std::move(functor_)} {}
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~Callable() override = default;
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ResultType operator()(Args&&... args) override {
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return functor(std::forward<Args>(args)...);
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}
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private:
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Functor functor;
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};
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public:
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UniqueFunction() = default;
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template <typename Functor>
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UniqueFunction(Functor&& functor)
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: callable{std::make_unique<Callable<Functor>>(std::move(functor))} {}
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UniqueFunction& operator=(UniqueFunction&& rhs) noexcept = default;
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UniqueFunction(UniqueFunction&& rhs) noexcept = default;
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UniqueFunction& operator=(const UniqueFunction&) = delete;
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UniqueFunction(const UniqueFunction&) = delete;
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ResultType operator()(Args&&... args) const {
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return (*callable)(std::forward<Args>(args)...);
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}
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explicit operator bool() const noexcept {
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return static_cast<bool>(callable);
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}
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private:
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std::unique_ptr<CallableBase> callable;
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};
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} // namespace Common
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