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* spaceItem = new _BookItem;
+	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 spaceItem;
+				BookItem spaceItem;
 				spaceItem._sFirstName = sFirstName;
 				spaceItem._sLastName = sLastName;
 				spaceItem._sPhoneNumber1 = sPhoneNumber1;
@@ -72,6 +72,13 @@ int CBookItems::GetItem(int nNumOfItem, string& sFirstName, string& sLastName, s
 	}
 }
 
+const CBookItems::BookItem& CBookItems::GetItem(int nNumOfItem)
+{
+  if (nNumOfItem < 0 || nNumOfItem > _aItems.size()) return CBookItems::BookItem();
+  return _aItems[nNumOfItem];
+}
+
+
 int CBookItems::GetSize()
 {
 	return _aItems.size();
@@ -300,4 +307,28 @@ int CBookItems::LoadItems(string sNameOfFile)
 	}
 
 	
+}
+
+std::ostream& operator<<(std::ostream& s, const CBookItems::BookItem& item)
+{
+  s << item._sFirstName << " " << item._sLastName << ": " << item._sPhoneNumber1;
+  if (item._sPhoneNumber2 != "")
+    s << ", " << item._sPhoneNumber2;
+
+	return s;
+}
+
+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

@@ -19,16 +19,46 @@ using namespace std;
 
 class CBookItems
 {
-private:
-	struct _BookItem
+public:
+  template<class T>
+	class BaseBookItem
 	{
-		string _sFirstName;
-		string _sLastName;
-		string _sPhoneNumber1;
-		string _sPhoneNumber2;
-	};
+		protected:
+			T _sFirstName;
+			T _sLastName;
+			T _sPhoneNumber1;
+			T _sPhoneNumber2;
+		public:
+			BaseBookItem()
+			{
+			}
+			virtual ~BaseBookItem()
+			{
+			}
+			virtual const string to_string() const = 0;
+  };
 
-	vector<_BookItem> _aItems;
+  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;
+      const string to_string() const;
+  };
+
+	vector<BookItem> _aItems;
 
 public:
 	
@@ -68,6 +98,12 @@ public:
 	*/
 	int GetItem(int nNumOfItem, string& sFirstName, string& sLastName, string& sPhoneNumber1, string& sPhoneNumber2);
 
+	//===============================================================================
+	/**
+	*Âîçâðàùàåò ýëåìåíò òåëåôîííîãî ñïðàâî÷íèêà
+	*/
+	const BookItem& GetItem(int nNumOfItem);
+
 	//===============================================================================
 	/**
 	*Âîçâðàùàåò êîëè÷åñòâî ýëåìåíòîâ â òåëåôîííîì ñïðàâî÷íèêå

phoebook/CConsoleUI.cpp

@@ -21,15 +21,7 @@ void CConsoleUI::PrintPhoneBook(CBookItems& CPhoneBook)
 	if (CPhoneBook.GetSize() >= 1)
 	{
 		for (int i = 0; i < CPhoneBook.GetSize(); i++)
-		{
-			string sFName = " ";
-			string sLName = " ";
-			string sNum1 = " ";
-			string sNum2 = " ";
-
-			CPhoneBook.GetItem(i, sFName, sLName, sNum1, sNum2);
-			cout << 1 + i << ". " << sFName << " " << sLName << ": " << sNum1 << ", " << sNum2 << endl;
-		}
+		  cout << 1 + i << ". " << CPhoneBook.GetItem(i) << endl;
 	}
 	else
 	{
@@ -94,13 +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;
 	}
 }