casacore::LELUnary< T > Class Template Reference

This LEL class handles numerical unary operators. More...

#include <LELUnary.h>

Public Member Functions
	LELUnary (const LELUnaryEnums::Operation op, const CountedPtr< LELInterface< T > > &pExpr)
	Constructor takes operation and expression to be operated upon. More...
	~LELUnary ()
	Destructor does nothing. More...
virtual void	eval (LELArray< T > &result, const Slicer &section) const
	Recursively evaluate the expression. More...
virtual LELScalar< T >	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< T >
virtual	~LELInterface ()
	Virtual destructor. More...
virtual void	evalRef (LELArrayRef< T > &result, const Slicer &section) const
LELArray< T >	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
LELUnaryEnums::Operation	op_p
CountedPtr< LELInterface< T > >	pExpr_p

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

Detailed Description

template<class T>
class casacore::LELUnary< T >

This LEL class handles numerical unary operators.

Intended use:

Internal

Review Status

Date Reviewed:

yyyy/mm/dd

Prerequisite

• Lattice
• LatticeExpr
• LatticeExprNode
• LELInterface
• LELUnaryEnums

Etymology

This derived LEL letter class handles numerical unary operators

Synopsis

This LEL letter class is derived from LELInterface. It is used to construct LEL objects that apply numerical unary operators to Lattice expressions. They operate on numerical Lattice (Float,Double,Complex,DComplex) expressions and return the same numerical type. The available C++ operators
are +,- with equivalents in the enum of PLUS and MINUS.

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. An example of how the user would indirectly use this class (through the envelope) is:

IPosition shape(2,5,10);
ArrayLattice<Float> x(shape); x.set(1.0);
ArrayLattice<Float> y(shape); 
y.copyData(-x);                 // y = -x

Motivation

Numerical unary operations are a basic mathematical expression.

Definition at line 186 of file LELUnary.h.

Constructor & Destructor Documentation

LELUnary()

template<class T >

casacore::LELUnary< T >::LELUnary	(	const LELUnaryEnums::Operation	op,
		const CountedPtr< LELInterface< T > > &	pExpr
	)

Constructor takes operation and expression to be operated upon.

~LELUnary()

template<class T >

casacore::LELUnary< T >::~LELUnary

(

)

Destructor does nothing.

Member Function Documentation

className()

template<class T >

virtual String casacore::LELUnary< T >::className ( ) const

virtual

Get class name.

Implements casacore::LELInterface< T >.

eval()

template<class T >

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

virtual

Recursively evaluate the expression.

Implements casacore::LELInterface< T >.

getScalar()

template<class T >

virtual LELScalar<T> casacore::LELUnary< T >::getScalar ( ) const

virtual

Recursively evaluate the scalar expression.

Implements casacore::LELInterface< T >.

hasLock()

template<class T >

virtual Bool casacore::LELUnary< T >::hasLock ( FileLocker::LockType  ) const

virtual

Reimplemented from casacore::LELInterface< T >.

lock()

template<class T >

virtual Bool casacore::LELUnary< T >::lock ( FileLocker::LockType  , uInt  nattempts  )

virtual

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

Reimplemented from casacore::LELInterface< T >.

prepareScalarExpr()

template<class T >

virtual Bool casacore::LELUnary< T >::prepareScalarExpr ( )

virtual

Do further preparations (e.g.

optimization) on the expression.

Implements casacore::LELInterface< T >.

resync()

template<class T >

virtual void casacore::LELUnary< T >::resync ( )

virtual

Reimplemented from casacore::LELInterface< T >.

unlock()

template<class T >

virtual void casacore::LELUnary< T >::unlock ( )

virtual

Reimplemented from casacore::LELInterface< T >.

Member Data Documentation

op_p

template<class T >

LELUnaryEnums::Operation casacore::LELUnary< T >::op_p

private

Definition at line 220 of file LELUnary.h.

pExpr_p

template<class T >

CountedPtr<LELInterface<T> > casacore::LELUnary< T >::pExpr_p

private

Definition at line 221 of file LELUnary.h.

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

• lattices/LEL/LELUnary.h