Point< T > Class Template Reference

Detailed Description

template<typename T>
class lemon::dim2::Point< T >

A simple two dimensional vector (plain vector) implementation with the usual vector operations.

#include <lemon/dim2.h>

Public Member Functions
	Point ()
	Default constructor.
	Point (T a, T b)
	Construct an instance from coordinates.
int	size () const
	Returns the dimension of the vector (i.e. returns 2). More...
T &	operator[] (int idx)
	Subscripting operator. More...
const T &	operator[] (int idx) const
	Const subscripting operator. More...
template<class TT >
	Point (const Point< TT > &p)
	Conversion constructor.
T	normSquare () const
	Give back the square of the norm of the vector.
Point< T > &	operator+= (const Point< T > &u)
	Increment the left hand side by u.
Point< T > &	operator-= (const Point< T > &u)
	Decrement the left hand side by u.
Point< T > &	operator*= (const T &u)
	Multiply the left hand side with a scalar.
Point< T > &	operator/= (const T &u)
	Divide the left hand side by a scalar.
T	operator* (const Point< T > &u) const
	Return the scalar product of two vectors.
Point< T >	operator+ (const Point< T > &u) const
	Return the sum of two vectors.
Point< T >	operator- () const
	Return the negative of the vector.
Point< T >	operator- (const Point< T > &u) const
	Return the difference of two vectors.
Point< T >	operator* (const T &u) const
	Return a vector multiplied by a scalar.
Point< T >	operator/ (const T &u) const
	Return a vector divided by a scalar.
bool	operator== (const Point< T > &u) const
	Test equality.
bool	operator!= (Point u) const
	Test inequality.

Public Attributes
T	x
	First coordinate.
T	y
	Second coordinate.

Related Functions
(Note that these are not member functions.)
template<typename T >
Point< T >	makePoint (const T &x, const T &y)
	Return a Point. More...
template<typename T >
Point< T >	operator* (const T &u, const Point< T > &x)
	Return a vector multiplied by a scalar. More...
template<typename T >
std::istream &	operator>> (std::istream &is, Point< T > &z)
	Read a plain vector from a stream. More...
template<typename T >
std::ostream &	operator<< (std::ostream &os, const Point< T > &z)
	Write a plain vector to a stream. More...
template<typename T >
Point< T >	rot90 (const Point< T > &z)
	Rotate by 90 degrees. More...
template<typename T >
Point< T >	rot180 (const Point< T > &z)
	Rotate by 180 degrees. More...
template<typename T >
Point< T >	rot270 (const Point< T > &z)
	Rotate by 270 degrees. More...

Member Function Documentation

int size ( ) const

inline

The dimension of the vector. This function always returns 2.

T& operator[] ( int  idx )

inline

p[0] is p.x and p[1] is p.y

const T& operator[] ( int  idx ) const

inline

p[0] is p.x and p[1] is p.y