--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/boost-spirit/CALC/closure2/EUC/node.cpp	Mon May 09 03:11:59 2011 +0900
@@ -0,0 +1,31 @@
+#include <iostream>
+#include "node.h"
+
+int cnode::expr(std::map<std::string, int> &values) const
+{
+	switch (op_) {
+	  case OP_NEG:
+		return -left_->expr(values);
+
+	  case OP_PLUS:
+		return left_->expr(values) + right_->expr(values);
+
+	  case OP_MINUS:
+		return left_->expr(values) - right_->expr(values);
+
+	  case OP_TIMES:
+		return left_->expr(values) * right_->expr(values);
+
+	  case OP_DIVIDE:
+		return left_->expr(values) / right_->expr(values);
+
+	  case OP_NUMBER:
+		return number_;
+
+	  case OP_IDENT:
+		return values[string_];
+
+	  default:
+		return 0;		// error
+	}
+}