Addison Wesley : C++ Gotchas: Avoiding Common Problems in Coding and Design by By

Author:By
Language: eng
Format: epub
ISBN: 0-321-12518-5
Publisher: Addison Wesley
Published: 2011-10-03T15:18:51.542750+00:00

Gotcha #53: Virtual Base Default Initialization

A virtual base subobject is laid out differently from a nonvirtual base subobject. A nonvirtual base class is typically laid out as if it were a simple data member of a derived class object, as in Figure 5-1. It may therefore occur more than once within an object:

class A { members }; class B : public A { members }; class C : public A { members }; class D : public B, public C { members };

Figure 5-1. Likely object layout under multiple inheritance without virtual inheritance. A D object has two A subobjects.

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