casacore::LELBinaryBool Class Reference

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

#include <LELBinary.h>

Inheritance diagram for casacore::LELBinaryBool:
casacore::LELInterface< Bool >

List of all members.

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.
 ~LELBinaryBool ()
 Destructor.
virtual void eval (LELArray< Bool > &result, const Slicer &section) const
 Recursively evaluate the expression.
virtual LELScalar< BoolgetScalar () const
 Recursively evaluate the scalar expression.
virtual Bool prepareScalarExpr ()
 Do further preparations (e.g.
virtual String className () const
 Get class name.
virtual Bool lock (FileLocker::LockType, uInt nattempts)
 Handle locking/syncing of a lattice in a lattice expression.
virtual void unlock ()
virtual Bool hasLock (FileLocker::LockType) const
virtual void resync ()

Private Attributes

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

Detailed Description

This LEL class handles logical binary operators.

Intended use:

Internal

Review Status

Date Reviewed:
yyyy/mm/dd

Prerequisite

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

Definition at line 346 of file LELBinary.h.

Definition at line 347 of file LELBinary.h.

Definition at line 348 of file LELBinary.h.


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