Glossary: Null Pointer
A null pointer is a
pointer
that is currently pointing to nothing.
Often pointers are set to zero to make
them null pointers or tested against zero to see if they are null, e.g.:-
<![CDATA[
TObject mypointer = 0;
]]>
and
<![CDATA[
if ( mypointer ) printf("mypointer is pointing to something\n");
]]>
Actually
the C++ standard does not require that a null pointer be represented by
zero - although it does require that assignments and tests against zero work as
if it were.
See OO Concepts: 1Pointers and References
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Nick West