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12 mm (2 06) 13 to 20 g 120 or 80 mm 15 mm 452 to 48 mm 48 to 116 mm 48 to 76 mm 70 to 117 mm 117 to 120 mm 77 to 80 mm 45% to 85% 650 or 635 nm 060 047 m 074 m

Now all we have to do is implement the ComparePhotos method to compare two Photograph items. Much of this will be similar to the CompareAlbums method. The one difference is when we need to compare items using the Taken column. This column holds a date value, so a string comparison is not appropriate. It turns out the DateTime structure provides a Compare method for just this purpose. We can use this method in the ComparePhotos method to our comparer class.

int main() { Z i; cout << imake_ab(); return 0; }

When this program runs, it displays the following:

IMPLEMENT METHOD TO COMPARE TWO PHOTO ITEMS Action 4 Add a new ComparePhotos method to the MyListViewComparer class. Result

12 mm (01+11) 12 to 17 g 120 mm 15 mm 44 to 444 mm 398 to 48 mm 116 mm 116 to 120 mm 35 to 70% (DL),12 to 28% (DL)

Notice that the base classes are constructed in the order they appear from left to right in Z s declaration In general, when a list of base classes is used, the constructors are called in order from left to right Destructors are called in order from right to left

public int ComparePhotos (ListViewItem item1, ListViewItem item2) { ListViewItem.ListViewSubItem sub1; ListViewItem.ListViewSubItem sub2; switch (SortColumn) {

So far, none of the examples of inheritance have included a base class constructor that used parameters As long as no base class constructor requires arguments, a derived class need not do anything special However, when a base class constructor requires arguments, your derived classes must explicitly handle this situation by passing the necessary arguments to the base class To accomplish this, you will use an extended form of the constructor function within the derived class that passes arguments to the constructor function of the base class This extended form is shown here: derived-constructor(arg-list) : base1(arg-list), base2(arg-list), , baseN(arg-list) { // } Here, base1 through baseN are the names of the base classes inherited by the derived class Notice that the colon is used to separate the derived class s constructor function from the argument lists of the base classes The argument lists associated with the base classes can consist of constants, global variables, or the parameters to the derived class s constructor function Since an object s initialization occurs at run time, you can use as an argument any identifier that is defined within the current scope

case MainForm.PhotoCaptionColumn: case MainForm.PhotoPhotographerColumn: case MainForm.PhotoFileNameColumn: sub1 = item1.SubItems[SortColumn]; sub2 = item2.SubItems[SortColumn]; return CaseInsensitiveComparer. Default.Compare(sub1.Text, sub2.Text); case MainForm.PhotoDateTakenColumn: // Find the indices into the album int index1 = (int)item1.Tag; int index2 = (int)item2.Tag; // Look up the dates for each photo DateTime date1 = CurrentAlbum[index1].DateTaken; DateTime date2 = CurrentAlbum[index2].DateTaken; return DateTime.Compare(date1, date2);

The following program illustrates how to pass arguments to the base classes of a derived class by modifying the preceding program:

12 mm 14 to 33 g 120 or 80 mm 15 mm 46 to 50 mm 50 to 116 mm 50 to 76 mm 76 to 117 mm 117 to 120 mm 77 to 80 mm 70% min 780 nm 038 to 045 1 ( 2 m) 16 mm (11 ma)

#include <iostream> using namespace std; class X { protected: int a; public: X(int i) { a = i; } }; class Y { protected: int b; public: Y(int i) { b = i; } } ;

For the Taken column, determine the index into the album for each photo. Then determine the corresponding DateTime value for each photo. Use the Compare method provided by the DateTime structure to calculate the result. Throw an exception if an unrecognized column is provided.

// Z inherits both X and Y class Z : public X, public Y { public: /* Initialize X and Y via Z's constructor Notice that Z does not actually use x or y itself, but it could, if it so chooses */ Z(int x, int y) : X(x), Y(y) { cout << "Initializing\n"; } int make_ab() { return a*b; } } ; int main() { Z i(10, 20); cout << imake_ab(); return 0; }