1 files changed, 22 insertions, 0 deletions
diff --git a/doc/sources/c++/triangle.cpp b/doc/sources/c++/triangle.cpp
new file mode 100644
index 0000000..96185d0
--- /dev/null
+++ b/doc/sources/c++/triangle.cpp
@@ -0,0 +1,22 @@
+#include "polygon.hpp"
+#include <cmath>
+
+class triangle : public polygon
+{
+	public:
+		virtual double area() const
+		{
+			return side_length_ * side_length_ * sqrt(3) / 2;
+		}
+};
+
+// the class factories
+extern "C" polygon* create()
+{
+    return new triangle;
+}
+
+extern "C" void destroy(polygon* p)
+{
+    delete p;
+}