SDK: Add StateMachine (FSM)

Former-commit-id: 8029f7cce71809ff1f661982d39750c48c86431f

SDK/include/NDK/StateMachine.inl

@@ -0,0 +1,26 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/StateMachine.hpp>
+#include <utility>
+
+namespace Ndk
+{
+	inline void StateMachine::ChangeState(std::shared_ptr<State> state)
+	{
+		m_nextState = std::move(state);
+	}
+
+	inline bool StateMachine::Update(float elapsedTime)
+	{
+		if (m_nextState)
+		{
+			m_currentState->Leave(*this);
+			m_currentState = std::move(m_nextState);
+			m_currentState->Enter(*this);
+		}
+
+		return m_currentState->Update(*this, elapsedTime);
+	}
+}