Ndk/StateMachine: Add constructor/destructor, should be usable now

Former-commit-id: fab76ba97470e8d7a2f4a01a9d1746a8e213892f

SDK/include/NDK/StateMachine.inl

@@ -2,11 +2,24 @@
 // This file is part of the "Nazara Development Kit"
 // For conditions of distribution and use, see copyright notice in Prerequesites.hpp
 
+#include <Nazara/Core/Error.hpp>
 #include <NDK/StateMachine.hpp>
 #include <utility>
 
 namespace Ndk
 {
+	inline StateMachine::StateMachine(std::shared_ptr<State> originalState) :
+	m_currentState(std::move(originalState))
+	{
+		NazaraAssert(m_currentState, "StateMachine must have a state to begin with");
+	}
+
+	inline StateMachine::~StateMachine()
+	{
+		m_currentState->Leave(*this);
+	}
+
+
 	inline void StateMachine::ChangeState(std::shared_ptr<State> state)
 	{
 		m_nextState = std::move(state);