From fcecd0e7dc0bf103986c02e2f29fb518cd5571c5 Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@carlo-laptop>
Date: Thu, 3 May 2012 15:35:39 +1000
Subject: Add a parser for linear equations

(Also add the antlr jar and C runtime)
---
 impl/Expression.hpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'impl/Expression.hpp')

diff --git a/impl/Expression.hpp b/impl/Expression.hpp
index 668f4fd..913bf7a 100644
--- a/impl/Expression.hpp
+++ b/impl/Expression.hpp
@@ -5,6 +5,9 @@
 #include "VariableAssignment.hpp"
 #include "Operator.hpp"
 
+template<typename T>
+struct Variable;
+
 int ExpressionCount;
 
 template<typename T>
@@ -12,7 +15,9 @@ struct Expression {
   Expression(Operator<T>* op, const std::vector< Expression<T>* >& args)
     : _operator(op), _arguments(args) { }
   virtual ~Expression() {
-    delete _operator;
+    if (!dynamic_cast<Variable<T>*>(_operator)) {
+      delete _operator;
+    }
   }
   virtual T operator() (const VariableAssignment<T>& assignment) const {
     return (*_operator)(_arguments, assignment);
@@ -52,4 +57,6 @@ struct MaxExpression : public Expression<T> {
   unsigned int _id;
 };
 
+#include "Variable.hpp"
+
 #endif
-- 
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