CObArray::operator [ ]

  • 项目

CObject*&operator[](intnIndex**);**

CObject*operator[](intnIndex**)const;**

Remarks

These subscript operators are a convenient substitute for the SetAt and GetAt functions.

The first operator, called for arrays that are not const, may be used on either the right (r-value) or the left (l-value) of an assignment statement. The second, called for const arrays, may be used only on the right.

The Debug version of the library asserts if the subscript (either on the left or right side of an assignment statement) is out of bounds.

The following table shows other operators that are similar to CObArray::operator [].

Class Operator
CByteArray BYTE& operator []( int nIndex );
BYTE operator []( int nIndex ) const;
CDWordArray DWORD& operator []( int nIndex );
DWORD operator []( int nIndex ) const;
CPtrArray void*& operator []( int nIndex );
void* operator []( int nIndex ) const;
CStringArray CString& operator []( int nIndex );
CString operator []( int nIndex ) const;
CUIntArray UINT& operator []( int nIndex );
UINT operator []( int nIndex ) const;
CWordArray WORD& operator []( int nIndex );
WORD operator []( int nIndex ) const;

Example

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

// example for CObArray::operator []

CObArray array;
CAge* pa;

array.Add( new CAge( 21 ) ); // Element 0
array.Add( new CAge( 40 ) ); // Element 1
pa = (CAge*)array[0]; // Get element 0
ASSERT( *pa == CAge( 21 ) ); // Get element 0
array[0] = new CAge( 30 ); // Replace element 0
delete pa;
ASSERT( *(CAge*) array[0] == CAge( 30 ) ); // Get new element 0

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See Also   CObArray::GetAt, CObArray::SetAt