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myclass x = y; // y explicitly initializating x func(y); // y passed as a parameter y = func(); // y receiving a temporary, return object C++

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public string AlbumFile { get { return _album.FileName; } }

Following is an example where an explicit copy constructor is needed This program creates a very simple safe integer array type that prevents array boundaries from being overrun Storage for each array is allocated by the use of new, and a pointer to the memory is maintained within each array object

private void menuOpen_Click (object sender, System.EventArgs e) {

/* This program creates a "safe" array class Since space for the array is allocated using new, a copy constructor is provided to allocate memory when one array object is used to initialize another */ #include <iostream> #include <new>

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#include <cstdlib> using namespace std; class array { int *p; int size; public: array(int sz) { try { p = new int[sz]; } catch (bad_alloc xa) { cout << "Allocation Failure\n"; exit(EXIT_FAILURE); } size = sz; } ~array() { delete [] p; } // copy constructor array(const array &a);

. . . if (dlg.ShowDialog() == DialogResult.OK) { try { // See if album is already open foreach (Form f in MdiChildren) { if (f is MainForm) { MainForm mf = (MainForm) f; if (mf.AlbumFile == dlg.FileName) { if (mf.WindowState == FormWindowState.Minimized) { mf.WindowState = FormWindowState.Normal; } mf.BringToFront(); return; } } } // Open new child window for album MainForm form = new MainForm(dlg.FileName); . . . }

// Copy Constructor array::array(const array &a) { int i; try { p = new int[asize]; } catch (bad_alloc xa) { cout << "Allocation Failure\n"; exit(EXIT_FAILURE); } for(i=0; i<asize; i++) p[i] = ap[i]; }

If a MainForm instance is found, see if it displays the selected album. If a match is found, bring the existing album to the front of the application window.

void put(int i, int j) { if(i>=0 && i<size) p[i] = j; } int get(int i) { return p[i]; }

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a. If the form is minimized, return it to a normal state. b. Display the form at the front of the MDI window. 6 If no matching window is found, the existing code will create a new MainForm object for the album.

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int main() { array num(10); int i; for(i=0; i<10; i++) numput(i, i); for(i=9; i>=0; i--) cout << numget(i); cout << "\n"; // create another array and initialize with num array x(num); // invokes copy constructor for(i=0; i<10; i++) cout << xget(i); return 0; }

This code uses some properties we have not seen before. When a matching child Form is found, the WindowState property is used to assign or retrieve the current display state of the MDI child form within its container. For a top-level form, this affects the display state on the desktop. The WindowState property takes its values from the FormWindowState enumeration, summarized in .NET Table 16.2. In the previous table, we check to see if the MDI child is minimized, and if so return it to a Normal state. 552

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When num is used to initialize x, the copy constructor is called, memory for the new array is allocated and stored in xp, and the contents of num are copied to x s array In this way, x and num have arrays that have the same values, but each array is separate and distinct (That is, nump and xp do not point to the same piece of memory) If the copy constructor had not been created, the default bitwise initialization would have resulted in x and num sharing the same memory for their arrays (That is, nump and xp would have, indeed, pointed to the same location) The copy constructor is called only for initializations For example, this sequence does not call the copy constructor defined in the preceding program: