CDefaultCompareTraits Class

This class provides default element comparison functions.

Syntax

template<typename T>
class CDefaultCompareTraits

Parameters

T
The type of data to be stored in the collection.

Members

Public Methods

Name	Description
CDefaultCompareTraits::CompareElements	(Static) Call this function to compare two elements for equality.
CDefaultCompareTraits::CompareElementsOrdered	(Static) Call this function to determine the greater and lesser element.

Remarks

This class contains two static functions for comparing elements stored in a collection class object. This class is utilized by the CDefaultElementTraits Class.

For more information, see ATL Collection Classes.

Requirements

Header: atlcoll.h

CDefaultCompareTraits::CompareElements

Call this function to compare two elements for equality.

static bool CompareElements(const T& element1, const T& element2);

Parameters

element1
The first element.

element2
The second element.

Return Value

Returns true if the elements are equal, false otherwise.

Remarks

The default implementation of this function is the equality (==) operator. For objects other than simple data types, this function may need to be overridden.

CDefaultCompareTraits::CompareElementsOrdered

Call this function to determine the greater and lesser element.

static int CompareElementsOrdered(const T& element1, const T& element2);

Parameters

element1
The first element.

element2
The second element.

Return Value

Returns an integer based on the following table:

Condition	Return value
element1 < element2	<0
element1 == element2	0
element1 > element2	>0

Remarks

The default implementation of this function uses the ==, <, and > operators. For objects other than simple data types, this function may need to be overridden.

See also

Class Overview