From e00c1e3f71bb1840e10a85af53469a81c73c7ef1 Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@pc-4w14-0.cs.usyd.edu.au>
Date: Mon, 30 Apr 2012 21:17:07 +1000
Subject: Functional algorithm. Unoptimised.

---
 impl/Expression.hpp | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

(limited to 'impl/Expression.hpp')

diff --git a/impl/Expression.hpp b/impl/Expression.hpp
index 46ccf23..7b157c2 100644
--- a/impl/Expression.hpp
+++ b/impl/Expression.hpp
@@ -1,6 +1,7 @@
 #ifndef EXPRESSION_HPP
 #define EXPRESSION_HPP
 
+//#include <pair>
 #include "VariableAssignment.hpp"
 #include "Operator.hpp"
 
@@ -16,13 +17,10 @@ struct Expression {
       delete *it;
     }*/
   }
-  const std::vector<Expression<T>*>& arguments() const {
-    return _arguments;
-  }
   virtual T operator() (const VariableAssignment<T>& assignment) const {
     return (*_operator)(_arguments, assignment);
   }
-  private:
+  protected:
   Operator<T>* _operator;
   std::vector< Expression<T>* > _arguments;
 };
@@ -37,6 +35,22 @@ struct MaxExpression : public Expression<T> {
   unsigned int id(unsigned int id) {
     return (_id = id);
   }
+  Expression<T>* argument(unsigned int i) const {
+    if (i >= Expression<T>::_arguments.size()) {
+      throw "Error";
+    }
+    return Expression<T>::_arguments[i];
+  }
+  std::pair<T, unsigned int> bestStrategy(const VariableAssignment<T>& rho) const {
+    std::pair<T, unsigned int> best = std::pair<T, unsigned int>(-infinity<T>(), 0);
+    for (unsigned int i = 0, size = Expression<T>::_arguments.size(); i < size; ++i) {
+      T value = (*Expression<T>::_arguments[i])(rho);
+      if (value > best.first)
+        best = std::pair<T, unsigned int>(value, i);
+    }
+    std::cout << "Best strategy: (" << best.first << ", " << best.second << ")" << std::endl;
+    return best;
+  }
   private:
   unsigned int _id;
 };
-- 
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