one-stage-and-two-stage-construction-of-objects.md

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Learn more about: One-Stage and Two-Stage Construction of Objects	One-Stage and Two-Stage Construction of Objects	11/04/2016	objects [MFC], creating graphic objects object creation [MFC], graphic objects objects [MFC], graphic objects one-stage and two-stage construction of objects [MFC]	5a1c410c-4a4b-4dd9-a2ec-ced831aa7f21

One-Stage and Two-Stage Construction of Objects

You have a choice between two techniques for creating graphic objects, such as pens and brushes:

• One-stage construction: Construct and initialize the object in one stage, all with the constructor.

• Two-stage construction: Construct and initialize the object in two separate stages. The constructor creates the object and an initialization function initializes it.

Two-stage construction is always safer. In one-stage construction, the constructor could throw an exception if you provide incorrect arguments or memory allocation fails. That problem is avoided by two-stage construction, although you do have to check for failure. In either case, destroying the object is the same process.

Note

These techniques apply to creating any objects, not just graphic objects.

Example of Both Construction Techniques

The following brief example shows both methods of constructing a pen object:

[!code-cppNVC_MFCDocViewSDI#6]

What do you want to know more about

• Graphic objects

• Selecting a graphic object into a device context

• Device contexts

• Drawing in a View

See also

Graphic Objects