regina::DiscSpec Struct Reference

Specifies a single normal disc in a normal surface. More...

#include <surface/disc.h>

Public Member Functions
	DiscSpec ()=default
	Creates a new uninitialised disc specifier.
	DiscSpec (size_t newTetIndex, int newType, unsigned long newNumber)
	Creates a new disc specifier containing the given values.
	DiscSpec (const DiscSpec &)=default
	Creates a new disc specifier that is a clone of the given specifier.
DiscSpec &	operator= (const DiscSpec &)=default
	Copies the values from the given disc specifier into this specifier.
bool	operator== (const DiscSpec &) const =default
	Determines if this and the given disc specifier contain identical information.

Public Attributes
size_t	tetIndex
	The index in the triangulation of the tetrahedron containing the disc.
int	type
	The disc type; this is between 0 and 9 inclusive, as described in the DiscSpec class notes.
unsigned long	number
	Specifies which disc of the particular type in the particular tetrahedron is being referred to; discs are numbered as described in the DiscSpec class notes.

Friends
std::ostream &	operator<< (std::ostream &out, const DiscSpec &spec)
	Writes the given disc specifier to the given output stream.

Detailed Description

Specifies a single normal disc in a normal surface.

There are 10 disc types. Types 0-3 represent triangles 0-3, types 4-6 represent quads 0-2 and types 7-9 represent octagons 0-2.

Discs of a specific type are assigned numbers from 0 upwards. Triangular discs are numbered outwards from the vertex they surround. Quad discs and octagonal discs are numbered outwards away from vertex 0 of the tetrahedron.

Note that, unlike DiscType in which the meaning of DiscType::type is flexible, the meaning of DiscSpec::type is fixed as described above.

These objects are small enough to pass by value and swap with std::swap(), with no need for any specialised move operations or swap functions.

Warning

This class converts the indices of normal discs of a given type from LargeInteger to unsigned long. See the precondition below.

Precondition

The number of normal discs of a particular type in a particular tetrahedron can be represented by a long integer.

This class should only be used with embedded normal surfaces.

Constructor & Destructor Documentation

DiscSpec() [1/3]

regina::DiscSpec::DiscSpec ( )

default

Creates a new uninitialised disc specifier.

DiscSpec() [2/3]

regina::DiscSpec::DiscSpec ( size_t newTetIndex, int newType, unsigned long newNumber )

inline

Creates a new disc specifier containing the given values.

Parameters

newTetIndex	the index in the triangulation of the tetrahedron containing the disc.
newType	the disc type; this is between 0 and 9 inclusive, as described in the DiscSpec class notes.
newNumber	specifies which disc of the particular type in the particular tetrahedron is being referred to; discs are numbered as described in the DiscSpec class notes.

DiscSpec() [3/3]

regina::DiscSpec::DiscSpec ( const DiscSpec & )

default

Creates a new disc specifier that is a clone of the given specifier.

Member Function Documentation

operator=()

DiscSpec & regina::DiscSpec::operator= ( const DiscSpec & )

default

Copies the values from the given disc specifier into this specifier.

Returns

a reference to this disc specifier.

operator==()

bool regina::DiscSpec::operator== ( const DiscSpec & ) const

default

Determines if this and the given disc specifier contain identical information.

Returns

true if and only if this and the given disc specifier contain identical information.

Friends And Related Symbol Documentation

operator<<

std::ostream & operator<< ( std::ostream & out, const DiscSpec & spec )

friend

Writes the given disc specifier to the given output stream.

The disc specifier will be written as a triple (tetIndex, type, number).

Parameters

out	the output stream to which to write.
spec	the disc specifier to write.

Returns

a reference to out.

Member Data Documentation

number

unsigned long regina::DiscSpec::number

Specifies which disc of the particular type in the particular tetrahedron is being referred to; discs are numbered as described in the DiscSpec class notes.

tetIndex

size_t regina::DiscSpec::tetIndex

The index in the triangulation of the tetrahedron containing the disc.

type

int regina::DiscSpec::type

The disc type; this is between 0 and 9 inclusive, as described in the DiscSpec class notes.

---

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

• surface/disc.h