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Initial: 0 1 2 3 4 5 6 7 8 9 Reversed: 9 8 7 6 5 4 3 2 1 0

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The photograph is now scaled and displayed within our PictureBox control. Note how we used the entire client rectangle rather than the rectangle provided in the Graphics object to ensure that the entire control area is redrawn. It is worth noting here that binding to the Tag property is not strictly required. Since we access the current Photograph object here, we could simply load the associated image correctly. There may be a slight performance advantage here in having the image already available in the Tag property, so we selected the approach shown in the table. 600

One of the more interesting algorithms is transform( ) because it modifies each element in a range according to a function that you provide The transform( ) algorithm has these two general forms template <class InIter, class OutIter, class Func) OutIter transform(InIter start, InIter end, OutIter result, Func unaryfunc); template <class InItter1, class InIter2, class OutIter, class Func) OutIter transform(InIter1 start1, InIter1 end1, InIter2 start2, OutIter result, Func binaryfunc); The transform( ) algorithm applies a function to a range of elements and stores the outcome in result In the first form, the range is specified by start and end The function to be applied is specified by unaryfunc This function receives the value of an element in its parameter and must return its transformation In the second form, the transformation is applied using a binary operator function that receives the value of an element from the sequence to be transformed in its first parameter and a element from the second sequence as its second parameter Both versions return an iterator to the end of the resulting sequence The following program uses a simple transformation function called reciprocal( ) to transform the contents of a list of numbers into their reciprocals Notice that the resulting sequence is stored in the same list that provided the original sequence

// An example of the transform algorithm #include <iostream> #include <list> #include <algorithm> using namespace std; // A simple transformation function double reciprocal(double i) { return 10/i; // return reciprocal } int main() { list<double> vals; int i; // put values into list for(i=1; i<10; i++) valspush_back((double)i);

If you compile and run this application, make sure you note how the form resizes. In particular, notice how we set the Anchor properties in this example to maximize the area allocated for the image and notes controls. Our final topic is to ensure that any changes we make to the controls in the Photo tab are reflected in the album file. 17.4.5 SAVING CHANGES TO BOUND CONTROLS Changes made to bound controls are saved much like we saw for the DataGrid control earlier in the chapter. When an object supports the IEditableObject interface, the BeginEdit method is called whenever a bound property is assigned a new value, and the EndEdit method is called when the user is done making changes to the current item. If you experiment with our interface, you will find that the program usually but not always offers to save the most recent changes. The problem occurs when you edit a couple of values for a Photograph and then click the Close button. In this case, the EndEdit call is never made since the framework believes the edit is still active for the displayed item. As a result, the PhotoAlbum.HasEdits property will return the value false, and the changes are not saved. We can fix this by forcing the current edit to end when we exit the program.