LW6: Abstract Class BaseBookItem with virtual to_string() method.

phoebook/CBookItems.cpp

@@ -8,7 +8,7 @@ void CBookItems::CreateNewItem(string sFirstName, string sLastName, string sPhon
 
 void CBookItems::CreateNewItem(string sFirstName, string sLastName, string sPhoneNumber1, string sPhoneNumber2)
 {
-	BookItem<string>* spaceItem = new BookItem<string>;
+	BookItem* spaceItem = new BookItem;
 	spaceItem->_sFirstName = sFirstName;
 	spaceItem->_sLastName = sLastName;
 	spaceItem->_sPhoneNumber1 = sPhoneNumber1;
@@ -33,7 +33,7 @@ int CBookItems::SetNewValueToItem(string sFirstName, string sLastName, string sP
 		{
 			if (nNumOfItem == i)
 			{
-				BookItem<string> spaceItem;
+				BookItem spaceItem;
 				spaceItem._sFirstName = sFirstName;
 				spaceItem._sLastName = sLastName;
 				spaceItem._sPhoneNumber1 = sPhoneNumber1;
@@ -72,9 +72,9 @@ int CBookItems::GetItem(int nNumOfItem, string& sFirstName, string& sLastName, s
 	}
 }
 
-const CBookItems::BookItem<string>& CBookItems::GetItem(int nNumOfItem)
+const CBookItems::BookItem& CBookItems::GetItem(int nNumOfItem)
 {
-  if (nNumOfItem < 0 || nNumOfItem > _aItems.size()) return CBookItems::BookItem<string>();
+  if (nNumOfItem < 0 || nNumOfItem > _aItems.size()) return CBookItems::BookItem();
   return _aItems[nNumOfItem];
 }
 
@@ -309,7 +309,7 @@ int CBookItems::LoadItems(string sNameOfFile)
 	
 }
 
-std::ostream& operator<<(std::ostream& s, const CBookItems::BookItem<string>& item)
+std::ostream& operator<<(std::ostream& s, const CBookItems::BookItem& item)
 {
   s << item._sFirstName << " " << item._sLastName << ": " << item._sPhoneNumber1;
   if (item._sPhoneNumber2 != "")
@@ -318,8 +318,17 @@ std::ostream& operator<<(std::ostream& s, const CBookItems::BookItem<string>& it
 	return s;
 }
 
-std::istream& operator>>(std::istream& s, CBookItems::BookItem<string>& item)
+std::istream& operator>>(std::istream& s, CBookItems::BookItem& item)
 {
   s >> item._sFirstName >> item._sLastName >> item._sPhoneNumber1 >> item._sPhoneNumber2;
 	return s;
+}
+
+const string CBookItems::BookItem::to_string() const
+{
+  string str = _sFirstName + " " + _sLastName + ": " + _sPhoneNumber1;
+
+  if (_sPhoneNumber2 != "")
+    str += ", " + _sPhoneNumber2;
+  return str;
 }

phoebook/CBookItems.h

@@ -21,32 +21,44 @@ class CBookItems
 {
 public:
   template<class T>
-	class BookItem
+	class BaseBookItem
 	{
-		private:
+		protected:
 			T _sFirstName;
 			T _sLastName;
 			T _sPhoneNumber1;
 			T _sPhoneNumber2;
 		public:
-			BookItem()
+			BaseBookItem()
 			{
 			}
-			virtual ~BookItem()
+			virtual ~BaseBookItem()
 			{
 			}
+			virtual const string to_string() const = 0;
+  };
 
-		//===============================================================================
-		/**
-		*Ïåðåîïðåäåëÿåò îïåðàòîðû âûâîäà/âûâîäà
-		*/
-		friend std::ostream& operator<<(std::ostream& s, const BookItem<string>& item);
-		friend std::istream& operator>>(std::istream& s, BookItem<string>& item);
+  class BookItem : BaseBookItem<string>
+  {
+    public:
+      BookItem()
+      {
+      }
+      virtual ~BookItem()
+      {
+      }
+  		//===============================================================================
+  		/**
+  		*Ïåðåîïðåäåëÿåò îïåðàòîðû âûâîäà/âûâîäà
+  		*/
+  		friend std::ostream& operator<<(std::ostream& s, const BookItem& item);
+  		friend std::istream& operator>>(std::istream& s, BookItem& item);
 
-		friend CBookItems;
-	};
+      friend CBookItems;
+      const string to_string() const;
+  };
 
-	vector<BookItem<string> > _aItems;
+	vector<BookItem> _aItems;
 
 public:
 	
@@ -90,7 +102,7 @@ public:
 	/**
 	*Âîçâðàùàåò ýëåìåíò òåëåôîííîãî ñïðàâî÷íèêà
 	*/
-	const BookItem<string>& GetItem(int nNumOfItem);
+	const BookItem& GetItem(int nNumOfItem);
 
 	//===============================================================================
 	/**

phoebook/CConsoleUI.cpp

@@ -86,13 +86,7 @@ void CConsoleUI::FindItem(CBookItems& CPhoneBook)
 
 	for (int i = 0; i < nNumOfDesirvedItems.size(); i++)
 	{
-		string sFName = " ";
-		string sLName = " ";
-		string sNum1 = " ";
-		string sNum2 = " ";
-
-		CPhoneBook.GetItem(nNumOfDesirvedItems.at(i), sFName, sLName, sNum1, sNum2);
-		cout << 1 + i << ". " << sFName << " " << sLName << ": " << sNum1 << ", " << sNum2 << endl;
+		cout << 1 + i << ". " << CPhoneBook.GetItem(nNumOfDesirvedItems.at(i)).to_string() << endl;
 	}
 }