regina::DegreeLessThan< dim, subdim > Class Template Reference

A function object used for sorting faces of triangulations by increasing degree. More...

#include <triangulation/generic/triangulation.h>

Public Member Functions
	DegreeLessThan (const Triangulation< dim > &tri)
	Constructions a function object for working with faces of the given triangulation. More...
	DegreeLessThan (const DegreeLessThan &)=default
	Creates a new clone of the given function object. More...
bool	operator() (unsigned a, unsigned b) const
	Compares the degrees of the subdim-dimensional faces at the given indices within the working triangulation. More...
DegreeLessThan &	operator= (const DegreeLessThan &)=delete

Detailed Description

template<int dim, int subdim>
class regina::DegreeLessThan< dim, subdim >

A function object used for sorting faces of triangulations by increasing degree.

This can (for instance) be used with std::sort().

The template argument dim refers to the dimension of the overall triangluation(s) with which you are working. The template argument subdim refers to the dimension of the faces that you are sorting. So, for instance, to sort edges of a 3-manifold triangulation by increasing edge degree, you would use DegreeLessThan<3, 1>.

A single instance of this class works with faces of a single fixed triangulation (which is passed to the class constructor).

An object of this class behaves like a reference: it is lightweight and can be copy-constructed cheaply, but it does not support assignments or swaps.

Precondition

dim is one of Regina's standard dimensions.

subdim is between 0 and dim-1 inclusive.

Constructor & Destructor Documentation

DegreeLessThan() [1/2]

template<int dim, int subdim>

regina::DegreeLessThan< dim, subdim >::DegreeLessThan ( const Triangulation< dim > &  tri )

inline

Constructions a function object for working with faces of the given triangulation.

Parameters

tri	the triangulation with which we are working.

DegreeLessThan() [2/2]

template<int dim, int subdim>

regina::DegreeLessThan< dim, subdim >::DegreeLessThan ( const DegreeLessThan< dim, subdim > &  )

default

Creates a new clone of the given function object.

Member Function Documentation

operator()()

template<int dim, int subdim>

bool regina::DegreeLessThan< dim, subdim >::operator() ( unsigned  a, unsigned  b  ) const

inline

Compares the degrees of the subdim-dimensional faces at the given indices within the working triangulation.

The triangulation that is used will be the one that was passed to the class constructor.

Precondition

Both a and b are non-negative, and are strictly less than the total number of subdim-dimensional faces in the triangulation.

Parameters

a	the index of the first subdim-dimensional face within the triangulation.
b	the index of the second subdim-dimensional face within the triangulation.

Returns

true if and only if face a has smaller degree than face b within the given triangulation.

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

• triangulation/generic/triangulation.h