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The MenuMerge enumeration specifies various types of behavior for a MenuItem object when it is merged with another menu. This enumeration is used by the MergeType property in the MenuItem class, and is part of the System.Windows.Forms namespace. Add The item is added to the collection of MenuItem objects in the merged menu. All MenuItem objects contained by the item are merged with those contained by the menu at the same position in the merged menu. The item is not included in the merged menu. The item replaces an existing MenuItem object at the same position in the merged menu.

j ETSI EN 300 472 V122: Digital Video Broadcasting (DVB); Specification for convey-

As this program demonstrates, when using this approach you must check the pointer returned by new after each allocation request

In our MyPhotos application, we have already used the Label and TextBox classes while creating dialog boxes in chapter 8. Here we will look at these classes in a bit more detail as we place them on our PhotoEditDlg form. To do this, we need to come up with some reasonable properties in our Photograph class that will facilitate the creation of these and other controls. The following features will serve our purposes rather well: Caption a caption for the photo. We created this property in chapter 8. Date the date the photograph was taken. We will present this as a string on our form here, and convert our dialog to use the DateTimePicker control in chapter 11. Photographer the person who took the photo. For now, we will treat this setting as a string. Later in the book this setting will be taken from a list of possible photographers. Notes random notes or other comments about the photograph.

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ing ITU-R System B Teletext in DVB bitstreams (1997-08)

A dialog to support these new settings is shown in figure 9.2. This dialog will be constructed and discussed over the next few sections. In this section we will create the infrastructure required in the Photograph class to support these new settings, add the required controls to the dialog, and invoke the dialog from the main form of our MyPhotos class. We also look at some of the settings and events provided by the TextBox class for modifying the behavior or appearance of the control. We will start with the changes required in our Photograph class.

It is possible to overload new and delete You might want to do this to use some special allocation method For example, you may want allocation routines that automatically begin using a disk file as virtual memory when the heap has been exhausted Whatever the reason, it is a very simple matter to overload these operators The skeletons for the functions that overload new and delete are void *operator new(size_t size) { // perform allocation return pointer_to_memory; } void operator delete(void *p) { // free memory pointed to by p } The parameter size will contain the number of bytes needed to hold the object being allocated This value is automatically obtained for you The overloaded new function must return a pointer to the memory that it allocates or throw a bad_alloc exception if an allocation error occurs Beyond these constraints, the overloaded new function can do anything else you require When you allocate an object using new (whether your own version or not), the object s constructor is automatically called The delete function receives a pointer to the region of memory to free It must then release the memory pointed to by that pointer When an object is deleted, its destructor function is automatically called The new and delete operators can be overloaded globally so that all uses of these operators call your custom versions They can also be overloaded relative to one or more classes Let s begin with an example of overloading new and delete relative to a class For the sake of simplicity, no new allocation scheme will be used Instead, the overloaded operators will simply invoke the standard library functions malloc( ) and free( ) (In your own application, you may, of course, implement any alternative allocation scheme you like) To overload the new and delete operators for a class, simply make the overloaded operator functions class members For example, here the new and delete operators are overloaded for the loc class:.