From 76a4f0fcf3a9bf54ef910cdb2c0bebea37182391 Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@carlo-laptop>
Date: Thu, 26 Apr 2012 22:32:35 +1000
Subject: A new attempt. Better strategies implementation.

Still lacking:
  - Factories (to set the ids)
  - Solver
  - Systems of equations
---
 impl/main.cpp | 188 +++++++++-------------------------------------------------
 1 file changed, 28 insertions(+), 160 deletions(-)

(limited to 'impl/main.cpp')

diff --git a/impl/main.cpp b/impl/main.cpp
index 5b73068..589a1e7 100644
--- a/impl/main.cpp
+++ b/impl/main.cpp
@@ -1,172 +1,40 @@
 #include <iostream>
 #include <vector>
 #include <math.h>
-#include "Expression.hpp"
+
 #include "Operator.hpp"
-#include "EquationSystem.hpp"
-#include "ExpressionFactory.hpp"
+#include "Expression.hpp"
+#include "MaxStrategy.hpp"
 
 using namespace std;
 
-struct Variable : public Operator<float> {
-  Variable(const std::string& x)
-    : _value(x) { }
-  const float eval(const vector<Expression<float> >& v, const map<string, float>& m) const {
-    //assert(v.size() == 0);
-    return m.find(_value)->second;
-  }
-  virtual std::string output() const {
-    return "var";
-  }
-  private:
-  std::string _value;
-};
-
-struct Const : public Operator<float> {
-  Const(const float& x)
-    : _value(x) { }
-  const float eval(const vector<Expression<float> >& v, const map<string, float>& m) const {
-    //assert(v.size() == 0);
-    return _value;
-  }
-  virtual std::string output() const {
-    return "const";
-  }
-  private:
-  float _value;
-};
-
-struct Plus : public Operator<float> {
-  Plus(const float& x)
-    : _value(x) { }
-  const float eval(const vector<Expression<float> >& v, const map<string, float>& m) const {
-    //assert(v.size() == 1);
-    return _value + v[0].eval(m);
-  }
-  virtual std::string output() const {
-    return "+()";
-  }
-  private:
-  float _value;
-};
-
-struct Mult : public Operator<float> {
-  Mult(const float& x)
-    : _value(x) { }
-  const float eval(const vector<Expression<float> >& v, const map<string, float>& m) const {
-    //assert(v.size() == 1);
-    return _value * v[0].eval(m);
-  }
-  virtual std::string output() const {
-    return "*()";
-  }
+/*template<typename T>
+struct Complete {
+  Complete(const T& value)
+    : _value(value) { }
   private:
-  float _value;
-};
-
-ExpressionFactory<float> f;
-
-Expression<float> constant(float x) {
-  return f.createExpression(new Const(x), vector<Expression<float> >());
-}
-Expression<float> variable(string x) {
-  return f.createExpression(new Variable(x), vector<Expression<float> >());
-}
-Expression<float> add(float a, Expression<float> b) {
-  vector<Expression<float> > args;
-  args.push_back(b);
-  return f.createExpression(new Plus(a), args);
-}
-Expression<float> Max(Expression<float> a, Expression<float> b) {
-  vector<Expression<float> > args;
-  args.push_back(a);
-  args.push_back(b);
-  return f.createExpression(new Maximum<float>(), args);
-}
-Expression<float> Min(Expression<float> a, Expression<float> b) {
-  vector<Expression<float> > args;
-  args.push_back(a);
-  args.push_back(b);
-  return f.createExpression(new Minimum<float>(), args);
-}
-
-
-void tests() {
-  map<string,float> assignment;
-  assignment["x"] = -INFINITY;
-
-  EquationSystem<float> test;
-  test.add("x", Max(constant(0),
-                    Min(add(1, variable("x")),
-                        constant(100))));
-
-  test = test.maxStrategy(assignment);
-  cout << test.output();
-  assignment = test.solveBF(-INFINITY);
-  cout << assignment["x"] << endl;
-
-  test = test.maxStrategy(assignment);
-  cout << test.output();
-  assignment = test.solveBF(-INFINITY);
-  cout << assignment["x"] << endl;
-
-}
+  bool _infinity;
+  T _value;
+};*/
 
+std::vector< Expression<float>* > empty;
 int main () {
-  tests();
-  /*typedef Expression<float> E;
-  typedef vector<E> Args;
-  Args empty;
-
-  EquationSystem<float> test;
-
-  // problem:
-  // x = max(y, 10)
-  // y = 10 * x
-
-  test.add("x1", Max(constant(0),
-                     Min(add(-1, variable("x1")),
-                         variable("x2"))));
-  test.add("x2", Max(constant(0),
-                     Max(add(5, variable("x1")),
-                         variable("x1"))));
-  test.add("x3", Max(constant(0),
-                     Max(add(1, variable("x3")),
-                         add(0, variable("x1")))));
-
-  map<string, float> m = test.solveBF(-INFINITY);
-  cout << m["x1"] << endl;
-  cout << m["x2"] << endl;
-  cout << m["x3"] << endl;
-
-  m = test.maxStrategy(m).solveBF(-INFINITY);
-  cout << m["x1"] << endl;
-  cout << m["x2"] << endl;
-  cout << m["x3"] << endl;*/
-
-
-  /*Args xArgs;
-  xArgs.push_back(E(new Variable("x"), empty));
-  xArgs.push_back(E(new Const(10), empty));
-  test.add("x", E(new Maximum<float>(), xArgs));
-
-  Args yArgs;
-  yArgs.push_back(E(new Variable("x"), empty));
-  test.add("y", E(new Mult(10), yArgs));
-
-  map<string, float> m = test.solveBF(-INFINITY);
-  cout << m["x"] << endl;
-  cout << m["y"] << endl;
-
-  map<string,float> assignment;
-  assignment["x"] = -INFINITY;
-  assignment["y"] = -INFINITY;
-  map<string, float> result = test.maxStrategy(assignment).solveBF(INFINITY);
-  cout << result["x"] << endl;
-  cout << result["y"] << endl;
-
-
-  assignment["x"] = 12;
-  cout << E(new Maximum<float>(), xArgs).maxStrategyEager(assignment).eval(assignment) << endl;*/
+  Variable<float> x;
+  x.id(0);
+  Variable<float> y;
+  y.id(1);
+  VariableAssignment<float> rho(2);
+  rho[x] = 12;
+  rho[y] = 10;
+  Expression<float> expr(&x, empty);
+
+  std::vector<Expression<float>*> args;
+  args.push_back(new Expression<float>(&x, empty));
+  args.push_back(new Expression<float>(&y, empty));
+  MaxExpression<float> maxExpr(args);
+  maxExpr.id(0);
+  MaxStrategy<float> strat(1);
+  strat[maxExpr] = 0;
+  cout << strat(maxExpr,rho) << endl;
   return 0;
 }
-- 
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