Pointers And Memory - Contents

Pointer Rules

    No matter how complex a pointer structure gets, the list of rules remains short.

• A pointer stores a reference to its pointee. The pointee, in turn, stores something useful.
• The dereference operation on a pointer accesses its pointee. A pointer may only be dereferenced after it has been assigned to refer to a pointee. Most pointer bugs involve violating this one rule.
• Allocating a pointer does not automatically assign it to refer to a pointee. Assigning the pointer to refer to a specific pointee is a separate operation which is easy to forget.
• Assignment between two pointers makes them refer to the same pointee which introduces sharing.

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