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#pragma once |
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#include <functional> |
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#include <type_traits> |
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#include <utility> |
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#include "SmallStorage.hpp" |
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namespace utils { |
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template <typename Func, typename Return, typename... Args> |
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concept InvocableWith = std::is_invocable_r_v<Return, Func, Args...>; |
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template <typename...> |
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class Function; |
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template <typename Return, typename... Args> |
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class Function<Return(Args...)> { |
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public: |
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Function() = default; |
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template <InvocableWith<Return, Args...> Func> |
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explicit Function(Func&& func) { |
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using FuncType = std::remove_cvref_t<Func>; |
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callable_.template emplace<CallableDerived<FuncType>>( |
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std::forward<Func>(func)); |
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} |
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Function(Return (*func)(Args...)) { |
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callable_.template emplace<CallableDerived<Return (*)(Args...)>>(func); |
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} |
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Return operator()(Args... args) const { |
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if (callable_.empty()) { |
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throw std::bad_function_call(); |
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} |
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return callable_->invoke(std::forward<Args>(args)...); |
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} |
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private: |
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class CallableBase { |
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public: |
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explicit CallableBase() = default; |
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explicit CallableBase(const CallableBase&) = default; |
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explicit CallableBase(CallableBase&&) = default; |
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CallableBase& operator=(const CallableBase&) = default; |
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CallableBase& operator=(CallableBase&&) = default; |
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virtual ~CallableBase() = default; |
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virtual Return invoke(Args... args) = 0; |
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}; |
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template <InvocableWith<Return, Args...> FuncType> |
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class CallableDerived final : public CallableBase { |
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public: |
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template <InvocableWith<Return, Args...> FuncForwardType> |
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CallableDerived(FuncForwardType&& func) |
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: func_(std::forward<FuncForwardType>(func)) {} |
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Return invoke(Args... args) override { |
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return std::invoke(func_, std::forward<Args>(args)...); |
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} |
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private: |
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FuncType func_; |
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}; |
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static constexpr int smallStorageSize = 64; |
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SmallStorage<CallableBase, smallStorageSize> callable_{}; |
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}; |
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} // namespace utils |
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