CMapStringToOb::SetAt

void SetAt( LPCTSTR key, CObject* newValue );
throw( CMemoryException );

Parameters

key

Specifies the string that is the key of the new element.

newValue

Specifies the CObject pointer that is the value of the new element.

Remarks

The primary means to insert an element in a map. First, the key is looked up. If the key is found, then the corresponding value is changed; otherwise a new key-value element is created.

Example

See CObList::CObList for a listing of the CAge class used in all collection examples.

// example for CMapStringToOb::SetAt
   CMapStringToOb map;
   CAge* pa;

   map.SetAt( "Bart", new CAge( 13 ) );
   map.SetAt( "Lisa", new CAge( 11 ) ); // Map contains 2 
                                        // elements.
#ifdef _DEBUG
   afxDump.SetDepth( 1 );
   afxDump << "before Lisa's birthday: " << &map << "\n";
#endif
   if( map.Lookup( "Lisa", (CObject *&)pa ) )
   { // CAge 12 pointer replaces CAge 11 pointer.
      map.SetAt( "Lisa", new CAge( 12 ) );
      delete pa;  // Must delete CAge 11 to avoid memory leak.
   }
#ifdef _DEBUG
   afxDump << "after Lisa's birthday: " << &map << "\n";
#endif

The results from this program are as follows:

before Lisa's birthday: A CMapStringToOb with 2 elements
    [Lisa] = a CAge at $493C 11
    [Bart] = a CAge at $4654 13
after Lisa's birthday: A CMapStringToOb with 2 elements
    [Lisa] = a CAge at $49C0 12
    [Bart] = a CAge at $4654 13

CMapStringToOb Overview | Class Members | Hierarchy Chart