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With these changes in place, we can revamp our ItemActivate handler to select the corresponding tree node.

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general, however, if you need to have different versions of a function for different data types, you should use overloaded functions rather than templates

REIMPLEMENT THE ITEMACTIVATE EVENT HANDLER Action 8 Replace the ItemActivate event handler in the MainForm.cs code window. Result

In addition to creating explicit, overloaded versions of a generic function, you can also overload the template specification itself To do so, simply create another version of the template that differs from any others in its parameter list For example:

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

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// Overload a function template declaration #include <iostream> using namespace std; // First version of f() template template <class X> void f(X a) { cout << "Inside f(X a)\n a = " << a << endl; } // Second version of f() template template <class X, class Y> void f(X a, Y b) { cout << "Inside f(X a, Y b)\n a = " << a << "\n b = " << b << endl; } int main() { f(10); // calls f(X) f(10, 20); // calls f(X, Y) return 0; }

Generic functions are similar to overloaded functions except that they are more restrictive When functions are overloaded, you can have different actions performed

REIMPLEMENT THE ITEMACTIVATE EVENT HANDLER (continued) Action 9 If an item is selected, locate the file name associated with this item.

within the body of each function But a generic function must perform the same general action for all versions only the type of data may differ For example, in the following program, the overloaded functions could not be replaced by a generic function because they do not do the same thing

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if (listViewMain.SelectedItems.Count > 0) { // Find the file path for selected item string fileName = null; ListViewItem item = listViewMain.SelectedItems[0]; if (_albumsShown) { // Get the file for this album fileName = item.Tag as string; } else if (item.Tag is int) { // Use the index of the photograph int index = (int)item.Tag; fileName = _album[index].FileName; } if (fileName == null) { MessageBox.Show("This item cannot " + "be opened."); return; } // Find tree node with identical path TreeNode node = FindNode(fileName, true); if (node != null) { // Select the node to activate it. node.EnsureVisible(); treeViewMain.SelectedNode = node; } } }

#include <iostream> #include <cmath> using namespace std; void myfunc(int i) { cout << "value is: " << i << "\n"; } void myfunc(double d) { double intpart; double fracpart; fracpart = modf(d, &intpart); cout << "Fractional part: " << fracpart; cout << "\n"; cout << "Integer part: " << intpart; } int main() { myfunc(1); myfunc(122); return 0; }

a. If albums are displayed, the Tag property contains the album path. b. If photographs are displayed, the Tag property contains the index of this photo in the album.

In addition to generic functions, you can also define a generic class When you do this, you create a class that defines all algorithms used by that class, but the actual type of data being manipulated will be specified as a parameter when objects of that class are created Generic classes are useful when a class contains generalizable logic For example, the same algorithm that maintains a queue of integers will also work for a queue of characters Also, the same mechanism that maintains a linked list of mailing addresses will also maintain a linked list of auto part information By using a generic class, you can create a class that will maintain a queue, a linked list, and so on for any type of

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If a file name is found, locate the TreeNode corresponding to this item. If the node is found, a. Make sure the node is visible. b. Select the node.