From 63a10756032fa5c677787fba209706b8bf1e4bef Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@carlo-laptop>
Date: Thu, 26 Apr 2012 16:15:17 +1000
Subject: A bunch of modifications working to a good solver.

---
 impl/Expression.hpp | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

(limited to 'impl/Expression.hpp')

diff --git a/impl/Expression.hpp b/impl/Expression.hpp
index 7d2d956..97dda10 100644
--- a/impl/Expression.hpp
+++ b/impl/Expression.hpp
@@ -1,6 +1,7 @@
 #ifndef EXPRESSION_H
 #define EXPRESSION_H
 
+#include <ostream>
 #include <map>
 #include <string>
 #include <vector>
@@ -21,6 +22,9 @@ struct Maximum : public Operator<T> {
     }
     return value;
   }
+  virtual std::string output() const {
+    return "max";
+  }
 };
 
 template<typename T>
@@ -36,13 +40,16 @@ struct Minimum : public Operator<T> {
     }
     return value;
   }
+  virtual std::string output() const {
+    return "min";
+  }
 };
 
 
 template<typename T>
 struct Expression {
-  Expression(Operator<T>* o, const std::vector< Expression<T> >& a)
-    : _operator(o), _arguments(a) { }
+  Expression(unsigned int id, Operator<T>* o, const std::vector< Expression<T> >& a)
+    : _id(id), _operator(o), _arguments(a) { }
   virtual const T eval(std::map<std::string, T> m) const {
     return _operator->eval(_arguments, m);
   }
@@ -50,7 +57,7 @@ struct Expression {
   virtual Expression<T> maxStrategyEager(const std::map<std::string, T> assignment) const {
     if (dynamic_cast<Maximum<T>*>(_operator) != NULL) {
       T bestVal;
-      const Expression<T>* best;
+      const Expression<T>* best = NULL;
       for (typename std::vector<Expression<T> >::const_iterator it = _arguments.begin();
            it != _arguments.end();
            ++it) {
@@ -71,10 +78,34 @@ struct Expression {
     return Expression(_operator, newArgs);
   }
 
+  std::string output() const {
+    std::string result = _operator->output() + "(";
+    for (typename std::vector<Expression<T> >::const_iterator it = _arguments.begin();
+         it != _arguments.end();
+         ++it) {
+      if (it != _arguments.begin()) {
+        result += ", ";
+      }
+      result += it->output();
+    }
+    return result + ")";
+  }
+
   virtual ~Expression() {}
   private:
+  unsigned int _id;
   Operator<T>* _operator;
   std::vector< Expression<T> > _arguments;
+
+  template<typename E>
+  friend std::ostream& operator<<(std::ostream&, const Expression<E>&);
 };
 
+template<typename T>
+std::ostream& operator<<(std::ostream& cout, const Expression<T>& e) {
+  cout << e._operator->output() << "("
+    << ")";
+  return cout;
+}
+
 #endif
-- 
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