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casacore::LELBinaryCmp< T > Class Template Reference

This LEL class handles relational binary numerical operators. More...

#include <LELBinary.h>

Inheritance diagram for casacore::LELBinaryCmp< T >:
casacore::LELInterface< Bool >

Public Member Functions

 LELBinaryCmp (const LELBinaryEnums::Operation op, const CountedPtr< LELInterface< T > > &pLeftExpr, const CountedPtr< LELInterface< T > > &pRightExpr)
 Constructor takes operation and left and right expressions to be operated upon. More...
 
 ~LELBinaryCmp ()
 Destructor. More...
 
virtual void eval (LELArray< Bool > &result, const Slicer &section) const
 Recursively evaluate the expression. More...
 
virtual LELScalar< BoolgetScalar () 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< BoolgetArray () const
 Get the result of an array subexpression. More...
 
Bool isScalar () const
 Is the result of evaluating this expression a scalar ? More...
 
const IPositionshape () const
 Get the shape of the expression result. More...
 
const LELAttributegetAttribute () const
 Get expression attribute. More...
 

Private Attributes

LELBinaryEnums::Operation op_p
 
CountedPtr< LELInterface< T > > pLeftExpr_p
 
CountedPtr< LELInterface< T > > 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

template<class T>
class casacore::LELBinaryCmp< T >

This LEL class handles relational binary numerical operators.

Intended use:

Internal

Review Status

Date Reviewed:
yyyy/mm/dd

Prerequisite

Etymology

This derived LEL letter class handles relational numerical binary operators

Synopsis

This LEL letter class is derived from LELInterface. It is used to construct LEL objects that apply relational numerical binary operators to Lattice expressions. They operate on numerical (Float,Double,Complex,DComplex) Lattice expressions and result in a Bool. The available C++ operators are ==,!=>,>=,<,<=, with equivalents in the enum of EQ, NE, GT, GE, LT, and LE

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<Float> x(shape); x.set(1.0);
ArrayLattice<Float> y(shape); y.set(2.0);
ArrayLattice<Bool> z(shape);
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;
z.copyData(x<y); // z = x < y;
z.copyData(x<=y); // z = x <= y;

Motivation

Numerical relational binary operations are a basic mathematical expression.

Definition at line 210 of file LELBinary.h.

Constructor & Destructor Documentation

template<class T >
casacore::LELBinaryCmp< T >::LELBinaryCmp ( const LELBinaryEnums::Operation  op,
const CountedPtr< LELInterface< T > > &  pLeftExpr,
const CountedPtr< LELInterface< T > > &  pRightExpr 
)

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

It can only handle the comparison operators.

template<class T >
casacore::LELBinaryCmp< T >::~LELBinaryCmp ( )

Destructor.

Member Function Documentation

template<class T >
virtual String casacore::LELBinaryCmp< T >::className ( ) const
virtual

Get class name.

Implements casacore::LELInterface< Bool >.

template<class T >
virtual void casacore::LELBinaryCmp< T >::eval ( LELArray< Bool > &  result,
const Slicer section 
) const
virtual

Recursively evaluate the expression.

Implements casacore::LELInterface< Bool >.

template<class T >
virtual LELScalar<Bool> casacore::LELBinaryCmp< T >::getScalar ( ) const
virtual

Recursively evaluate the scalar expression.

Implements casacore::LELInterface< Bool >.

template<class T >
virtual Bool casacore::LELBinaryCmp< T >::hasLock ( FileLocker::LockType  ) const
virtual

Reimplemented from casacore::LELInterface< Bool >.

template<class T >
virtual Bool casacore::LELBinaryCmp< T >::lock ( FileLocker::LockType  ,
uInt  nattempts 
)
virtual

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

Reimplemented from casacore::LELInterface< Bool >.

template<class T >
virtual Bool casacore::LELBinaryCmp< T >::prepareScalarExpr ( )
virtual

Do further preparations (e.g.

optimization) on the expression.

Implements casacore::LELInterface< Bool >.

template<class T >
virtual void casacore::LELBinaryCmp< T >::resync ( )
virtual

Reimplemented from casacore::LELInterface< Bool >.

template<class T >
virtual void casacore::LELBinaryCmp< T >::unlock ( )
virtual

Reimplemented from casacore::LELInterface< Bool >.

Member Data Documentation

template<class T >
LELBinaryEnums::Operation casacore::LELBinaryCmp< T >::op_p
private

Definition at line 245 of file LELBinary.h.

template<class T >
CountedPtr<LELInterface<T> > casacore::LELBinaryCmp< T >::pLeftExpr_p
private

Definition at line 246 of file LELBinary.h.

template<class T >
CountedPtr<LELInterface<T> > casacore::LELBinaryCmp< T >::pRightExpr_p
private

Definition at line 247 of file LELBinary.h.


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