Problem 3 

Implement operator[]. The indexer has to search for the element that corresponds to aIndex. Also, aIndex may be out of bounds. Hence the indexer has to throw a  out_of_range exception.

You can use #define P3 in Main.cpp to enable the corresponding test driver.

void testP3() 

{ 

 using StringList = List<string>; 

 string s1( "AAAA" ); 

 string s2( "BBBB" ); 

 string s3( "CCCC" ); 

 string s4( "DDDD" ); 

 string s5( "EEEE" ); 

 string s6( "FFFF" ); 

 StringList lList; 

 lList.push_front( s4 ); 

 lList.push_front( s3 ); 

 lList.push_front( s2 ); 

 lList.push_front( s1 ); 

 lList.push_back( s5 ); 

 lList.push_back( s6 ); 

 cout << "Test of problem 3:" << endl; 

 try 

 { 

 cout << "Element at index 4: " << lList[4] << endl; 

 lList.remove( s5 ); 

 cout << "Element at index 4: " << lList[4] << endl;   

 cout << "Element at index 6: " << lList[6] << endl; 

 cout << "Error: You should not see this text." << endl; 

 } 

 catch (out_of_range e) 

 { 

 cerr << "\nSuccessfully caught error: " << e.what() << endl; 

 } 

cout << "Completed" << endl; 

} 

The result should look like this: 

Test of problem 3: 

Element at index 4: EEEE 

Element at index 4: FFFF 

Element at index 6:  

Successfully caught error: Index out of bounds. 

Completed

problemset-3