Class: TComparator

Declaration: Comparator.h

Taxonomy Categories:

Member Functions:

Interface Category:

API.

Inherits From:

TAbstractComparator

Inherited By:

TMCollectibleComparator TNamesMatchComparator TNullHashOperatorComparator TOperatorComparator TOrderedComparator

Purpose:

TComparator is an abstract class that you can use to perform comparison and hash operations on comparator objects.

Instantiation:

Allocate on the heap. These are adopted by the collections.

Deriving Classes:

Derive classes from TComparator when writing your own comparators.

Concurrency:

Not multithread safe.

Resource Use:

No special requirements.

Other Considerations:

None.

Member Function: TComparator::Compare

virtual EComparisonResult Compare (const AType & leftObj, const AType & rightObj) const

Interface Category:

API.

Purpose:

Compares two objects of the same type.

Calling Context:

Call this function directly to compare two objects. Normally called internally. Could be called externally to compare objects of AType.

Parameters:

const AType & leftObj -The left-hand object.
const AType & rightObj -The right-hand object.

Return Value:

Returns kLessThan, kGreaterThan, kEqual, kNotEqual, or kUndefined.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TComparator::GetHash

virtual HashResult GetHash (const AType & obj) const

Interface Category:

API.

Purpose:

Generates a hash value for an object.

Calling Context:

Call this function directly to generate a hash value for an object. Normally called internally. Could be called externally to get the hash of an AType object.

Parameters:

const AType & obj -The object for which the hash value is to be generated.

Return Value:

The hash value generated.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TComparator::TypeSafeCompare

virtual EComparisonResult TypeSafeCompare (void * leftObj, void * rightObj) const

Interface Category:

API.

Purpose:

Compares two objects of different types.

Calling Context:

Call this function directly to compare two objects of different types. Call this function internally.

Parameters:

void * leftObj -The left-hand object.
void * rightObj -The right-hand object.

Return Value:

Returns kLessThan, kGreaterThan, kEqual, kNotEqual, or kUndefined.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TComparator::TypeSafeGetHash

virtual HashResult TypeSafeGetHash (void * obj) const

Interface Category:

API.

Purpose:

Given a reference to an object, correctly casts and generates a hash value for the object.

Calling Context:

Call this function directly to generate a hash value for an object. Call this function internally.

Parameters:

void * obj -The object for which a hash value is to be generated.

Return Value:

The hash value.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TComparator::TComparator

TComparator ()
TComparator (const TComparator < AType > &)

Interface Category:

API.

Purpose:

Default constructor.
Copy constructor.

Calling Context:

Call this function directly anywhere the creation of a TComparator is desired.
Call this function directly to copy an object.

Parameters:

Takes no parameters.
const TComparator < AType > & -The object to be copied.

Return Value:

None.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TComparator::operator=

const TComparator < AType > & operator =(const TComparator < AType > &)

Interface Category:

API.

Purpose:

Assignment operator.

Calling Context:

Call this function directly when an object is assigned to another compatible object.

Parameters:

const TComparator < AType > & -The TComparator to be copied.

Return Value:

A reference to the left-hand side object.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

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