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Please explain typedef statement -- Easy One

Posted on 1999-01-21
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Last Modified: 2012-08-14
What type does TYPELIB_DATA end up being??
Please explain as to a newbie.
Thanks in advance.

typedef CTypedPtrArray<CPtrArray, CTypeLibraryData*> TYPELIB_DATA;
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Question by:shark351
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Tommy Hui earned 50 total points
ID: 1184818
TYPELIB_DATA is a type, that is what typedef does: it creates new types.

The type of TYPELIB is a CTypedPtrArray. But CTypedPtrArray is different in that it is a template class. So the stuff in between the < and > indicate how the template is specialized. In this case, CPtrArray and CTypeLibraryData*.

CPtrArray is the class that provides the implementation of how CTypedPtrArray should work. The CTypeLibraryData* is the type of data to be stored in the array.

So ultimately, TYPELIB_DATA is an array of pointers to CTypeLibraryData.
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Expert Comment

by:Aggarwal
ID: 1184819
typedef doesn't create a new type , it creates a new name for an existing  type .

typedef creates a new name "TYPELIB_DATA" to an existing type "CTypedPtrArray<CPtrArray, CTypeLibraryData*>" , its very much clear that CTypedPtrArray is a template class .
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