casacore::TableExprGroupNull Class Reference

Class derived from TableExprGroupFuncBase representing a no function. More...

#include <ExprGroup.h>

Inheritance diagram for casacore::TableExprGroupNull:

List of all members.

Public Member Functions
	TableExprGroupNull (TableExprNodeRep *node)
virtual	~TableExprGroupNull ()
virtual Bool	isLazy () const
	Does the aggregate function use lazy semantics? The default implementation returns False.
virtual void	apply (const TableExprId &id)
	Get the operand's value for the given row and apply it to the aggregation.

---

Detailed Description

Class derived from TableExprGroupFuncBase representing a no function.

Intended use:

Internal

Review Status

Test programs:

tExprGroup

Synopsis

This class represents a null aggregate function which is meant for possible aggregate functionality in UDFs.

Definition at line 266 of file ExprGroup.h.

---

Constructor & Destructor Documentation

casacore::TableExprGroupNull::TableExprGroupNull

(

TableExprNodeRep *

node

)

[explicit]

virtual casacore::TableExprGroupNull::~TableExprGroupNull

(

)

[virtual]

---

Member Function Documentation

virtual void casacore::TableExprGroupNull::apply

(

const TableExprId &

id

)

[virtual]

Get the operand's value for the given row and apply it to the aggregation.

This function should not be called for lazy classes.

Implements casacore::TableExprGroupFuncBase.

virtual Bool casacore::TableExprGroupNull::isLazy

(

)

const [virtual]

Does the aggregate function use lazy semantics? The default implementation returns False.

Reimplemented from casacore::TableExprGroupFuncBase.

---

The documentation for this class was generated from the following file:

• casacore/tables/TaQL/ExprGroup.h