A boolean coordinate. More...

#include <CoordinateExpr.h>

Inheritance diagram for lsst::afw::geom::CoordinateExpr< N >:

Public Member Functions
	CoordinateExpr (bool val=false)
	Construct a CoordinateExpr with all elements set to the same scalar value. More...

template<typename Vector >
	CoordinateExpr (Eigen::MatrixBase< Vector > const &vector)
	Construct a CoordinateExpr from an Eigen vector. More...

Logical operators
These operators do not provide interoperability with scalars.
CoordinateExpr	and_ (CoordinateExpr const &rhs) const

CoordinateExpr	or_ (CoordinateExpr const &rhs) const

CoordinateExpr	not_ () const

Public Member Functions inherited from lsst::afw::geom::CoordinateBase< CoordinateExpr< N >, bool, N >
bool &	operator[] (int n)

boolconst &	operator[] (int n) const

bool &	coeffRef (int n)

boolconst &	coeffRef (int n) const

EigenVector const &	asEigen () const
	Return a fixed-size Eigen representation of the coordinate object. More...

Private Types
typedef CoordinateBase < CoordinateExpr< N >, bool, N >	Super

Additional Inherited Members
Public Types inherited from lsst::afw::geom::CoordinateBase< CoordinateExpr< N >, bool, N >
typedef bool	Element

typedef Eigen::Matrix< bool, N, 1, Eigen::DontAlign >	EigenVector

Static Public Attributes inherited from lsst::afw::geom::CoordinateBase< CoordinateExpr< N >, bool, N >
static int const	dimensions

Protected Member Functions inherited from lsst::afw::geom::CoordinateBase< CoordinateExpr< N >, bool, N >
	CoordinateBase (boolval=static_cast< bool >(0))
	Initialize all elements to a scalar. More...

	CoordinateBase (Eigen::MatrixBase< Vector > const &vector)
	Initialize all elements from an N-d Eigen vector. More...

void	_swap (CoordinateBase &other)

Protected Attributes inherited from lsst::afw::geom::CoordinateBase< CoordinateExpr< N >, bool, N >
EigenVector	_vector

Detailed Description

template<int N>
class lsst::afw::geom::CoordinateExpr< N >

A boolean coordinate.

CoordinateExpr is intended to be used as a temporary in coordinate comparisons:

*  Point2D a(3.5,1.2);
*  Point2D b(-1.5,4.3);
*  std::cout << all(a.lt(b)) << std::endl;  // false
*  std::cout << any(a.lt(b)) << std::endl;  // true
*  

CoordinateExpr is not a true lazy-evaluation expression template, as that seems unnecessary when the object is typically only two bools large (smaller than the raw pointers necessary to implement a lazy solution). The consequence is that there's no short-circuiting of logical operators, but I don't think that will even remotely matter for most use cases. The any() and all() functions do support short-circuiting.

Definition at line 54 of file CoordinateExpr.h.