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CMapPtrToPtr Class

Supports maps of void pointers keyed by void pointers.

class CMapPtrToPtr : public CObject

The member functions of CMapPtrToPtr are similar to the member functions of class CMapStringToOb. Because of this similarity, you can use the CMapStringToOb reference documentation for member function specifics. Wherever you see a CObject pointer as a function parameter or return value, substitute a pointer to void. Wherever you see a CString or a const pointer to char as a function parameter or return value, substitute a pointer to void.

BOOL CMapStringToOb::Lookup( const char* <key>,

CObject*& <rValue> ) const;

for example, translates to

BOOL CMapPtrToPtr::Lookup( void* <key>, void*& <rValue> ) const;

Name

Description

CMapStringToOb::GetCount

Returns the number of elements in this map.

CMapStringToOb::GetHashTableSize

Determines the current number of elements in the hash table.

CMapStringToOb::GetNextAssoc

Gets the next element for iterating.

CMapStringToOb::GetSize

Returns the number of elements in this map.

CMapStringToOb::GetStartPosition

Returns the position of the first element.

CMapStringToOb::HashKey

Calculates the hash value of a specified key.

CMapStringToOb::InitHashTable

Initializes the hash table.

CMapStringToOb::IsEmpty

Tests for the empty-map condition (no elements).

CMapStringToOb::Lookup

Looks up a void pointer based on the void pointer key. The pointer value, not the entity it points to, is used for the key comparison.

CMapStringToOb::LookupKey

Returns a reference to the key associated with the specified key value.

CMapStringToOb::RemoveAll

Removes all the elements from this map.

CMapStringToOb::RemoveKey

Removes an element specified by a key.

CMapStringToOb::SetAt

Inserts an element into the map; replaces an existing element if a matching key is found.

Name

Description

CMapStringToOb::operator [ ]

Inserts an element into the map — operator substitution for SetAt.

CMapPtrToPtr incorporates the IMPLEMENT_DYNAMIC macro to support run-time type access and dumping to a CDumpContext object. If you need a dump of individual map elements (pointer values), you must set the depth of the dump context to 1 or greater.

Pointer-to-pointer maps may not be serialized.

When a CMapPtrToPtr object is deleted, or when its elements are removed, only the pointers are removed, not the entities they reference.

For more information on CMapPtrToPtr, see the article Collections.

Header: afxcoll.h

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