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Public Member Functions | Private Attributes
casa::LELBinaryBool Class Reference

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

#include <LELBinary.h>

Inheritance diagram for casa::LELBinaryBool:
casa::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

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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 310 of file LELBinary.h.


Constructor & Destructor Documentation

casa::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.

Destructor.


Member Function Documentation

virtual String casa::LELBinaryBool::className ( ) const [virtual]

Get class name.

Implements casa::LELInterface< Bool >.

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

Recursively evaluate the expression.

Implements casa::LELInterface< Bool >.

virtual LELScalar<Bool> casa::LELBinaryBool::getScalar ( ) const [virtual]

Recursively evaluate the scalar expression.

Implements casa::LELInterface< Bool >.

Reimplemented from casa::LELInterface< Bool >.

virtual Bool casa::LELBinaryBool::lock ( FileLocker::LockType  ,
uInt  nattempts 
) [virtual]

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

Reimplemented from casa::LELInterface< Bool >.

Do further preparations (e.g.

optimization) on the expression.

Implements casa::LELInterface< Bool >.

virtual void casa::LELBinaryBool::resync ( ) [virtual]

Reimplemented from casa::LELInterface< Bool >.

virtual void casa::LELBinaryBool::unlock ( ) [virtual]

Reimplemented from casa::LELInterface< Bool >.


Member Data Documentation

   

Definition at line 345 of file LELBinary.h.

Definition at line 346 of file LELBinary.h.

Definition at line 347 of file LELBinary.h.


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