GiNaC: GiNaC::multi_iterator_permutation< T > Class Template Reference

GiNaC 1.8.9

The class multi_iterator_permutation defines a multi_iterator , for which. More...

#include <utils_multi_iterator.h>

Inheritance diagram for GiNaC::multi_iterator_permutation< T >:

Public Member Functions
	multi_iterator_permutation (void)
	Default constructor.

	multi_iterator_permutation (T B, T N, size_t k)
	Construct a multi_iterator with upper limit N and size k .

	multi_iterator_permutation (T B, T N, const std::vector< T > &vv)
	Construct from a vector.

basic_multi_iterator< T > &	init (void)
	Initialize the multi-index to.

basic_multi_iterator< T > &	operator++ (int)
	The postfix increment operator allows to write for a multi-index n++, which will update n to the next configuration.

int	get_sign (void) const
	Returns the sign of the permutation, defined by.

Public Member Functions inherited from GiNaC::basic_multi_iterator< T >
	basic_multi_iterator (void)
	Default constructor.

	basic_multi_iterator (T B, T N, size_t k)
	Construct a multi_iterator with upper limit N, lower limit B and size k .

	basic_multi_iterator (T B, T N, const std::vector< T > &vv)
	Construct from a vector.

virtual	~basic_multi_iterator ()
	Destructor.

size_t	size (void) const
	Returns the size of a multi_iterator.

bool	overflow (void) const
	Return the overflow flag.

const std::vector< T > &	get_vector (void) const
	Returns a reference to the vector v.

T	operator[] (size_t i) const
	Subscription via [].

T &	operator[] (size_t i)
	Subscription via [].

T	operator() (size_t i) const
	Subscription via ()

T &	operator() (size_t i)
	Subscription via ()

Friends
template<class TT >
std::ostream &	operator<< (std::ostream &os, const multi_iterator_permutation< TT > &v)

Additional Inherited Members
Protected Attributes inherited from GiNaC::basic_multi_iterator< T >
T	N

T	B

std::vector< T >	v

bool	flag_overflow

Detailed Description

template<class T>
class GiNaC::multi_iterator_permutation< T >

The class multi_iterator_permutation defines a multi_iterator , for which.

$B \le i_j < N$

and

$i_i \neq i_j$

In particular, if , multi_iterator_permutation loops over all permutations of elements.

Definition at line 321 of file utils_multi_iterator.h.

Constructor & Destructor Documentation

◆ multi_iterator_permutation() [1/3]

template<class T >

GiNaC::multi_iterator_permutation< T >::multi_iterator_permutation ( void )

inline

Default constructor.

Definition at line 1119 of file utils_multi_iterator.h.

◆ multi_iterator_permutation() [2/3]

template<class T >

GiNaC::multi_iterator_permutation< T >::multi_iterator_permutation	(	T	B,
		T	N,
		size_t	k
	)

inlineexplicit

Construct a multi_iterator with upper limit N and size k .

Definition at line 1127 of file utils_multi_iterator.h.

◆ multi_iterator_permutation() [3/3]

template<class T >

GiNaC::multi_iterator_permutation< T >::multi_iterator_permutation	(	T	B,
		T	N,
		const std::vector< T > &	vv
	)

inlineexplicit

Construct from a vector.

Definition at line 1135 of file utils_multi_iterator.h.

Member Function Documentation

◆ init()

template<class T >

basic_multi_iterator< T > & GiNaC::multi_iterator_permutation< T >::init ( void )

inlinevirtual

Initialize the multi-index to.

$(n_1,n_2,n_3,...,n_k) = (B+0,B+1,B+2,...,B+k-1)$

Reimplemented from GiNaC::basic_multi_iterator< T >.

Definition at line 1148 of file utils_multi_iterator.h.

◆ operator++()

template<class T >

basic_multi_iterator< T > & GiNaC::multi_iterator_permutation< T >::operator++ ( int )

inlinevirtual

The postfix increment operator allows to write for a multi-index n++, which will update n to the next configuration.

If n is in the last configuration and the increment operator ++ is applied to n, the overflow flag will be raised.

Reimplemented from GiNaC::basic_multi_iterator< T >.

Definition at line 1171 of file utils_multi_iterator.h.

References k.

◆ get_sign()

template<class T >

int GiNaC::multi_iterator_permutation< T >::get_sign ( void ) const

inline

Returns the sign of the permutation, defined by.

$\left(-1\right)^{n_{inv}},$

where $n_{inv}$ is the number of inversions, e.g. the number of pairs for which

$n_i > n_j.$

Definition at line 1242 of file utils_multi_iterator.h.

References k.

Friends And Related Symbol Documentation

◆ operator<<

template<class T >

template<class TT >

std::ostream & operator<<	(	std::ostream &	os,
		const multi_iterator_permutation< TT > &	v
	)

friend

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

utils_multi_iterator.h

This page is part of the GiNaC developer's reference. It was generated automatically by doxygen. For an introduction, see the tutorial.