/*
 * expression-test.cc
 */
#include "Expression.h"
#include "Expression_Tree.h"
#include <iostream>
#include <stdexcept>
using namespace std;

int main()
{
   Expression e1;  // defaultkonstruktor

   if (e1.empty())
      cout << "Tomt uttryck!\n";
   else
      cout << "e1.evaluate() = " << e1.evaluate() << '\n';

   cout << "e1.get_postfix() = " << e1.get_postfix() << '\n';
   cout << boolalpha << "e1.empty() = " << e1.empty() << "\n\n";

   Expression e2{e1};  // kopieringskonstruktor

   try
   {
      cout << "e2.evaluate() = " << e2.evaluate() << '\n';
   }
   catch (const exception& e)
   {
      cout << "undantag fångat: " << e.what() << '\n';
   }

   cout << "e2.get_postfix() = " << e2.get_postfix() << '\n';
   cout << "e2.empty() = " << e2.empty() << "\n\n";
   
   e2.swap(e1);  // swap

   // Resten kräver implementering av Expression_Tree-klasserna.

/*
   Expression_Tree* t{new Plus{new Integer{7}, new Real{3.14}}};

   Expression e3{t};  // konstruktor som tar ett länkat uttrycksträd

   cout << "e3.evaluate() = " << e3.evaluate() << '\n';
   cout << "e3.get_postfix() = " << e3.get_postfix() << '\n';
   cout << "e3.empty() = " << e3.empty() << "\n\n";

   e2.swap(e3);  // swap

   cout << "e2.evaluate() = " << e2.evaluate() << '\n';
   cout << "e2.get_postfix() = " << e2.get_postfix() << '\n';
   cout << "e2.empty() = " << e2.empty() << "\n\n";

   Expression e4{e2};  // kopieringskonstruktor

   try
   {
      cout << "e4.evaluate() = " << e4.evaluate() << '\n';
   }
   catch (const exception& e)
   {
      cout << "Undantag fångat: " << e.what() << '\n';
   }
   cout << "e4.get_postfix() = " << e4.get_postfix() << '\n';
   cout << "e4.empty() = " << e4.empty() << "\n\n";

   Expression e5{std::move(e2)};  // move-konstruktor

   cout << "e5.evaluate() = " << e5.evaluate() << '\n';
   cout << "e5.get_postfix() = " << e5.get_postfix() << '\n';
   cout << "e5.empty() = " << e5.empty() << '\n';
   cout << "e2.empty() = " << e2.empty() << "\n\n";

   e2 = std::move(e5);  // move-tilldelning

   cout << "e2.evaluate() = " << e2.evaluate() << '\n';
   cout << "e2.get_postfix() = " << e2.get_postfix() << '\n';
   cout << "e2.empty() = " << e2.empty() << '\n';
   cout << "e5.empty() = " << e5.empty() << "\n\n";

*/

   return 0;
}