The delete operator and destructors

• When you delete a class object, the destructor is called for the class.
• If you delete an array of class objects, without using delete [], the destructor may only be called once, instead of once for each array object.

Example 4-15 - delete and destructors

1      // File: eTest4-15.cpp - delete or delete []
2     
3      #include <iostream>
4      using namespace std;
5     
6      class Test
7      {
8          int n;
9      public:
10          Test() { n = 0; cout << "Test constructor called\n"; }
11          ~Test() { cout << "Test destructor called\n"; }
12      };
13     
14      int main(void)
15      {
16          Test* ptrTest;
17     
18          cout << "allocate space for 1 Test\n";
19          ptrTest = new Test;
20          delete ptrTest;
21     
22          cout << "allocate space for 3 Tests\n";
23          ptrTest = new Test[3];
24          delete ptrTest;
25          // MS Visual C++ 2008 calls the destructor once, then errors
26          // Digital Mars C++ Compiler (ver 8.42) calls the destructor once
27          // gnu compiler (ver 4.3.1) calls destructor once, then crashes
28          return 0;
29      }

******  Output  ******

allocate space for 1 X
X constructor called
X destructor called
allocate space for 3 Xs
X constructor called
X constructor called
X constructor called
X destructor called

What is the problem here?