Object-oriented design patterns in the kernel, part 1 [LWN.net]

Object-oriented design patterns in the kernel, part 1

Posted Jun 1, 2011 16:01 UTC (Wed) by JohnLenz (subscriber, #42089)
In reply to: Object-oriented design patterns in the kernel, part 1 by mb
Parent article: Object-oriented design patterns in the kernel, part 1

Expanding on Joe Buck's comment, the C99 standard says the following in section 6.7.8

Except where explicitly stated otherwise, for the purposes of this subclause unnamed members of objects of structure and union type do not participate in initialization. Unnamed members of structure objects have indeterminate value even after initialization.

If an object that has automatic storage duration is not initialized explicitly, its value is indeterminate. If an object that has static storage duration is not initialized explicitly, then:

if it has pointer type, it is initialized to a null pointer;

if it has arithmetic type, it is initialized to (positive or unsigned) zero;

if it is an aggregate, every member is initialized (recursively) according to these rules;

if it is a union, the first named member is initialized (recursively) according to these rules.

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