refactor renderer

src/common/uniqueFunction.h

@@ -0,0 +1,56 @@
+#ifndef KYTY_COMMON_UNIQUEFUNCTION_H_
+#define KYTY_COMMON_UNIQUEFUNCTION_H_
+
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace Common {
+
+template <typename Result, typename... Args>
+class UniqueFunction {
+	class CallableBase {
+	public:
+		virtual ~CallableBase() = default;
+		virtual Result Invoke(Args&&... args) = 0;
+	};
+
+	template <typename Function>
+	class Callable final: public CallableBase {
+	public:
+		explicit Callable(Function function): m_function(std::move(function)) {}
+
+		Result Invoke(Args&&... args) override {
+			return m_function(std::forward<Args>(args)...);
+		}
+
+	private:
+		Function m_function;
+	};
+
+public:
+	UniqueFunction() = default;
+
+	template <typename Function>
+	UniqueFunction(Function&& function)
+	    : m_callable(std::make_unique<Callable<std::decay_t<Function>>>(
+	          std::forward<Function>(function))) {}
+
+	UniqueFunction(UniqueFunction&&) noexcept            = default;
+	UniqueFunction& operator=(UniqueFunction&&) noexcept = default;
+	UniqueFunction(const UniqueFunction&)                = delete;
+	UniqueFunction& operator=(const UniqueFunction&)     = delete;
+
+	Result operator()(Args... args) const {
+		return m_callable->Invoke(std::forward<Args>(args)...);
+	}
+
+	explicit operator bool() const noexcept { return m_callable != nullptr; }
+
+private:
+	std::unique_ptr<CallableBase> m_callable;
+};
+
+} // namespace Common
+
+#endif // KYTY_COMMON_UNIQUEFUNCTION_H_