Merge Tree branch

apps/tree/allocation_failed_expression_node.h

@@ -0,0 +1,26 @@
+#ifndef ALLOCATION_FAILED_EXPRESSION_NODE_H
+#define ALLOCATION_FAILED_EXPRESSION_NODE_H
+
+#include "expression_node.h"
+#include "expression_reference.h"
+#include <stdio.h>
+
+class AllocationFailedExpressionNode : public ExpressionNode {
+public:
+  // ExpressionNode
+  float approximate() override { return -1; } // Should return nan
+
+  // TreeNode
+  size_t size() const override { return sizeof(AllocationFailedExpressionNode); }
+  const char * description() const override { return "Allocation Failed";  }
+  Type type() const override { return Type::AllocationFailure; }
+  int numberOfChildren() const override { return 0; }
+  bool isAllocationFailure() const override { return true; }
+};
+
+class AllocationFailedExpressionRef : public ExpressionReference<AllocationFailedExpressionNode> {
+public:
+  using ExpressionReference<AllocationFailedExpressionNode>::ExpressionReference;
+};
+
+#endif