Re: Use of CString key in CMap

"David Ching" <>
Fri, 04 Apr 2008 08:35:44 GMT
"Kjell Arne Johansen" <> wrote in


I have a question about the use of CString as a key in a CMap. Is that
I want to get an object using a string name. Is that okay or will I
sometime get the wrong object because the haskey could be the same for two
different strings?

CMap<CString, CString &, csomecobject, csomecobject &> m_map

This hash key I found in CodeGuru, but I am not able to see if it is a
has key.

I would use CMapStringToObj as-is, without worrying about the hash function.
WIth maps, it is assumed there are unique keys for each object. The map can
contain only one instance of each key, so if you were to:

    CMapStringToOb map;
    map["geneva"] = switzerlandObject;
    map["geneva"] = alpsObject;

then switzerlandObject would no longer be in the map, having been replaced
with alpsObject.

The hash function is an internal implementation to the map, it enables using
a fixed size container such as an array of linked lists to put the objects
into. The hash function then would determine which element of the array
would hold each object (the object would in that element's linked list).

But the hash function does not allow multiple instances of the same key to
be put into the map.

-- David

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