casacore::LELBinaryBool Class Reference

This LEL class handles logical binary operators. More...

#include <LELBinary.h>

Inheritance diagram for casacore::LELBinaryBool:

Public Member Functions
	LELBinaryBool (const LELBinaryEnums::Operation op, const CountedPtr< LELInterface< Bool > > &pLeftExpr, const CountedPtr< LELInterface< Bool > > &pRightExpr)
	Constructor takes operation and left and right expressions to be operated upon. More...
	~LELBinaryBool ()
	Destructor. More...
virtual void	eval (LELArray< Bool > &result, const Slicer &section) const
	Recursively evaluate the expression. More...
virtual LELScalar< Bool >	getScalar () const
	Recursively evaluate the scalar expression. More...
virtual Bool	prepareScalarExpr ()
	Do further preparations (e.g. More...
virtual String	className () const
	Get class name. More...
virtual Bool	lock (FileLocker::LockType, uInt nattempts)
	Handle locking/syncing of a lattice in a lattice expression. More...
virtual void	unlock ()
virtual Bool	hasLock (FileLocker::LockType) const
virtual void	resync ()
Public Member Functions inherited from casacore::LELInterface< Bool >
virtual	~LELInterface ()
	Virtual destructor. More...
virtual void	evalRef (LELArrayRef< Bool > &result, const Slicer &section) const
LELArray< Bool >	getArray () const
	Get the result of an array subexpression. More...
Bool	isScalar () const
	Is the result of evaluating this expression a scalar ? More...
const IPosition &	shape () const
	Get the shape of the expression result. More...
const LELAttribute &	getAttribute () const
	Get expression attribute. More...

Private Attributes
LELBinaryEnums::Operation	op_p
CountedPtr< LELInterface< Bool > >	pLeftExpr_p
CountedPtr< LELInterface< Bool > >	pRightExpr_p

Additional Inherited Members
Static Public Member Functions inherited from casacore::LELInterface< Bool >
static Bool	replaceScalarExpr (CountedPtr< LELInterface< Bool > > &expr)
	If the given expression is a valid scalar, replace it by its result. More...
Protected Member Functions inherited from casacore::LELInterface< Bool >
void	setAttr (const LELAttribute &attrib)
	Set the expression attributes of this object. More...

Detailed Description

This LEL class handles logical binary operators.

Intended use:

Internal

Review Status

Date Reviewed:

yyyy/mm/dd

Prerequisite

• Lattice
• LatticeExpr
• LatticeExprNode
• LELInterface
• LELBinaryEnums

Etymology

This derived LEL letter class handles logical binary operators

Synopsis

This LEL letter class is derived from LELInterface. It is used to construct LEL objects that apply logical binary operators to Lattice expressions. They apply only to Bool Lattice expressions and result in a Bool. The available C++ operators are &&,||,==,!= with equivalents in the enum of AND, OR, EQ, and NE

A description of the implementation details of the LEL classes can be found in Note 216

Example

Examples are not very useful as the user would never use these classes directly. Look in LatticeExprNode.cc to see how it invokes these classes. Examples of how the user would indirectly use this class (through the envelope) are:

IPosition shape(2,5,10);
ArrayLattice<Bool> x(shape); x.set(False);
ArrayLattice<Bool> y(shape); y.set(True);
ArrayLattice<Bool> z(shape); z.set(False);
z.copyData(x&&y);                // z = x && y;
z.copyData(x||y);                // z = x || y;
z.copyData(x==y);                // z = x == y;
z.copyData(x!=y);                // z = x != y;

Motivation

Logical binary operations are a basic mathematical expression.

Definition at line 311 of file LELBinary.h.

Constructor & Destructor Documentation

casacore::LELBinaryBool::LELBinaryBool	(	const LELBinaryEnums::Operation	op,
		const CountedPtr< LELInterface< Bool > > &	pLeftExpr,
		const CountedPtr< LELInterface< Bool > > &	pRightExpr
	)

Constructor takes operation and left and right expressions to be operated upon.

casacore::LELBinaryBool::~LELBinaryBool

(

)

Destructor.

Member Function Documentation

virtual String casacore::LELBinaryBool::className ( ) const

virtual

Get class name.

Implements casacore::LELInterface< Bool >.

virtual void casacore::LELBinaryBool::eval ( LELArray< Bool > &  result, const Slicer &  section  ) const

virtual

Recursively evaluate the expression.

Implements casacore::LELInterface< Bool >.

virtual LELScalar<Bool> casacore::LELBinaryBool::getScalar ( ) const

virtual

Recursively evaluate the scalar expression.

Implements casacore::LELInterface< Bool >.

virtual Bool casacore::LELBinaryBool::hasLock ( FileLocker::LockType  ) const

virtual

Reimplemented from casacore::LELInterface< Bool >.

virtual Bool casacore::LELBinaryBool::lock ( FileLocker::LockType  , uInt  nattempts  )

virtual

Handle locking/syncing of a lattice in a lattice expression.

Reimplemented from casacore::LELInterface< Bool >.

virtual Bool casacore::LELBinaryBool::prepareScalarExpr ( )

virtual

Do further preparations (e.g.

optimization) on the expression.

Implements casacore::LELInterface< Bool >.

virtual void casacore::LELBinaryBool::resync ( )

virtual

Reimplemented from casacore::LELInterface< Bool >.

virtual void casacore::LELBinaryBool::unlock ( )

virtual

Reimplemented from casacore::LELInterface< Bool >.

Member Data Documentation

LELBinaryEnums::Operation casacore::LELBinaryBool::op_p

private

Definition at line 346 of file LELBinary.h.

CountedPtr<LELInterface<Bool> > casacore::LELBinaryBool::pLeftExpr_p

private

Definition at line 347 of file LELBinary.h.

CountedPtr<LELInterface<Bool> > casacore::LELBinaryBool::pRightExpr_p

private

Definition at line 348 of file LELBinary.h.

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

• casa/casacore/lattices/LEL/LELBinary.h