1 files changed, 30 insertions, 0 deletions
diff --git a/signal-composer-binding/observer.hpp b/signal-composer-binding/observer.hpp
new file mode 100644
index 0000000..e4129c6
--- /dev/null
+++ b/signal-composer-binding/observer.hpp
@@ -0,0 +1,30 @@
+#include <vector>
+
+class Observer
+{
+public:
+	virtual void update(double timestamp, double value) = 0;
+};
+
+class Subject
+{
+	double timestamp_;
+	double value_;
+	std::vector<Observer*> m_views;
+public:
+	void attach(Observer *obs)
+	{
+		m_views.push_back(obs);
+	}
+	void set_val(double timestamp, double value)
+	{
+		timestamp_ = timestamp;
+		value_ = value;
+		notify();
+	}
+	void notify()
+	{
+		for (int i = 0; i < m_views.size(); ++i)
+		  m_views[i]->update(timestamp_, value_);
+	}
+};