initial commit

oscar64/autotest/vcalltree.cpp

@@ -0,0 +1,79 @@
+#include <assert.h>
+
+struct Node
+{
+	virtual float eval(void)
+		{
+			return 1.0e6;
+		}
+};
+
+struct ConstNode : Node
+{
+	float	c;
+
+	ConstNode(float c_)
+		: c(c_) {}
+
+	virtual float eval(void)
+	{
+		return c;
+	}
+};
+
+struct BinopNode : Node
+{
+	Node	*	left, * right;
+
+	BinopNode(Node * left_, Node * right_)
+		: left(left_), right(right_)
+		{}
+};
+
+struct AddNode : BinopNode
+{
+	AddNode(Node * left_, Node * right_)
+		: BinopNode(left_, right_)
+		{}
+
+	virtual float eval(void)
+	{
+		return left->eval() + right->eval();
+	}
+};
+
+struct SubNode : BinopNode
+{
+	SubNode(Node * left_, Node * right_)
+		: BinopNode(left_, right_)
+		{}
+
+	virtual float eval(void)
+	{
+		return left->eval() - right->eval();
+	}
+};
+
+struct MulNode : BinopNode
+{
+	MulNode(Node * left_, Node * right_)
+		: BinopNode(left_, right_)
+		{}
+
+	virtual float eval(void)
+	{
+		return left->eval() * right->eval();
+	}
+};
+
+int main(void)
+{
+	Node	*	n = 
+		new SubNode(
+			new MulNode(new ConstNode(4), new ConstNode(5)),
+			new AddNode(new ConstNode(12), new ConstNode(7)));
+
+	assert(n->eval() == 1.0);
+
+	return 0;
+}