A gap decorator allows the annotation of sequences with gap symbols while leaving the underlying sequence unmodified. More...

#include <seqan3/range/decorator/gap_decorator.hpp>

Inheritance diagram for seqan3::gap_decorator< inner_type >:

Classes
class	gap_decorator_iterator
	The iterator type over a seqan3::gap_decorator. More...

Public Types
using	unaligned_seq_type = inner_type
	The underlying ungapped range type.

Range-associated member types
using	value_type = gapped< value_type_t< inner_type > >
	The variant type of the alphabet type and gap symbol type (see seqan3::gapped).

using	reference = value_type
	Use the value type as reference type because the underlying sequence must not be modified.

using	const_reference = reference
	const_reference type equals reference type equals value type because the underlying sequence must not be modified.

using	size_type = size_type_t< inner_type >
	The size_type of the underlying sequence.

using	difference_type = difference_type_t< inner_type >
	The difference type of the underlying sequence.

Public Member Functions
Constructors, destructor and assignment
constexpr	gap_decorator ()=default
	Default constructor. Attention: all operations on a solely default constructed decorator, except assigning a new range, are UB.

constexpr	gap_decorator (gap_decorator const &)=default
	Copy constructor.

constexpr gap_decorator &	operator= (gap_decorator const &)=default
	Copy construction via assignment.

constexpr	gap_decorator (gap_decorator &&rhs)=default
	Move constructor.

constexpr gap_decorator &	operator= (gap_decorator &&rhs)=default
	Move assignment.

	~gap_decorator ()=default
	Use default deconstructor.

template<typename other_range_t >
	gap_decorator (other_range_t &&range)
	Construct with the ungapped range type.

size_type	size () const noexcept
	Returns the total length of the aligned sequence. More...

Iterators
const_iterator	begin () const noexcept
	Returns an iterator to the first element of the container. More...

const_iterator	cbegin () const noexcept
	Returns an iterator to the first element of the container. More...

const_iterator	end () const noexcept
	Returns an iterator pointing behind the last element of the decorator. More...

const_iterator	cend () const noexcept
	Returns an iterator pointing behind the last element of the decorator. More...

Element access
reference	at (size_type const i)
	Return the i-th element as a reference. More...

const_reference	at (size_type const i) const
	Return the i-th element as a reference. More...

constexpr reference	operator[] (size_type const i) const noexcept
	Return the i-th element as a reference. More...

Friends

Comparison operators

Compares two seqan3::gap_decorator 's by underlying sequence and gaps.

Parameters

[in]	lhs	The left-hand side gap decorator to compare.
[in]	rhs	The right-hand side gap decorator to compare.

Returns: A boolean flag indicating (in)equality of the aligned sequences.

Complexity

Worst case: $O(n*\log k)$ Constant in case the decorators have not the same number of (consecutive) gaps.

Exceptions

No-throw guarantee. Does not modify the aligned sequences.

bool operator== (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is equal to rhs.

bool operator!= (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is not equal to rhs.

bool operator< (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is less than rhs.

bool operator<= (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is less than or equal to rhs.

bool operator> (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is greater than rhs.

bool operator>= (gap_decorator const &lhs, gap_decorator const &rhs) noexcept

Checks whether lhs is greater than or equal to rhs.

Related Functions
(Note that these are not member functions.)
Requirements for seqan3::aligned_sequence
You can expect these functions on all types that model seqan3::aligned_sequence.
std::ranges::iterator_t< aligned_seq_t >	insert_gap (aligned_seq_t &aligned_seq, typename aligned_seq_t::const_iterator pos_it)
	Insert a seqan3::gap into an aligned sequence. More...

std::ranges::iterator_t< aligned_seq_t >	insert_gap (aligned_seq_t &aligned_seq, typename aligned_seq_t::const_iterator pos_it, typename aligned_seq_t::size_type size)
	Insert multiple seqan3::gap into an aligned sequence. More...

std::ranges::iterator_t< aligned_seq_t >	erase_gap (aligned_seq_t &aligned_seq, typename aligned_seq_t::const_iterator pos_it)
	Erase a seqan3::gap from an aligned sequence. More...

std::ranges::iterator_t< aligned_seq_t >	erase_gap (aligned_seq_t &aligned_seq, typename aligned_seq_t::const_iterator first, typename aligned_seq_t::const_iterator last)
	Erase multiple seqan3::gap from an aligned sequence. More...

void	assign_unaligned (aligned_seq_t &aligned_seq, unaligned_sequence_type &&unaligned_seq)
	Assign an ungapped sequence to a gapped sequence. More...

Aligned sequence modifications
iterator	insert_gap (const_iterator const it, size_type const count=1)
	Insert a gap of length count at the aligned sequence iterator position. More...

iterator	erase_gap (const_iterator const it)
	Erase one gap symbol at the indicated iterator postion. More...

iterator	erase_gap (const_iterator const first, const_iterator const last)
	Erase gap symbols at the iterator postions [first, last[. More...

template<typename unaligned_seq_t >
void	assign_unaligned (gap_decorator &dec, unaligned_seq_t &&unaligned)
	Assigns a new sequence of type seqan3::gap_decorator::unaligned_seq_type to the decorator. More...

Detailed Description

template<std::ranges::viewable_range inner_type>
class seqan3::gap_decorator< inner_type >

A gap decorator allows the annotation of sequences with gap symbols while leaving the underlying sequence unmodified.

Template Parameters

inner_type The type of range that will be decorated with gaps; must model std::ranges::random_access_range and std::ranges::sized_range.

This class may be used whenever you want to store or compute an alignment. The underlying (ungapped) sequence remains unmodified, and is augmented with gap information. The seqan3::gap_decorator behaves just like a vector over a gapped alphabet when iterating over it, inserting/erasing gaps or accessing a position. The only difference lies in the performance and size overhead (see below).

Performance

n The length of the underlying sequence. k The number of contiguous gaps (not gap symbols). l The total number of gap symbols.

	access next	random access	gap insert/erase at end	gap insert/erase random	size overhead
decorator		$O(\log(k))$	$O(\log(k))$
vector

The size overhead refers to the space that is needed when using each of the data structures in addition to an already existing ungapped sequence.

Implementation details

This decorator stores a std::set over tuples of (pos, cumulative_size) where every entry represents one contiguous stretch of gaps. pos is the (virtual) insert position in the underlying range and cumulative_size is the length of that contiguous stretch of gaps plus the length of all preceding elements. Resolving random access requires logarithmic access into the set and inserting or removing a gap symbol additionally entails updating all subsequent elements in the set to preserve correct cumulative sizes.

The seqan3::gap_decorator::iterator type

Attention: The iterator of the seqan3::gap_decorator does not model the Cpp17BidirectionalIterator requirements of the STL because dereferencing the iterator returns a proxy and no operator-> is provided. It does model the C++20 std::bidirectional_iterator.

Member Function Documentation

◆ at() [1/2]

template<std::ranges::viewable_range inner_type>

reference seqan3::gap_decorator< inner_type >::at ( size_type const i )

inline

Return the i-th element as a reference.

Parameters

i	The element to retrieve.

Returns: A reference of the gapped alphabet type.

Complexity

$O(\log k)$ where $k$ is the number of gaps.

Exceptions

Throws std::out_of_range exception if i is out of range.

◆ at() [2/2]

template<std::ranges::viewable_range inner_type>

const_reference seqan3::gap_decorator< inner_type >::at ( size_type const i ) const

inline

Return the i-th element as a reference.

Parameters

i	The element to retrieve.

Returns: A reference of the gapped alphabet type.

Complexity

$O(\log k)$ where $k$ is the number of gaps.

Exceptions

Throws std::out_of_range exception if i is out of range.

◆ begin()

template<std::ranges::viewable_range inner_type>

const_iterator seqan3::gap_decorator< inner_type >::begin ( ) const

inlinenoexcept

Returns an iterator to the first element of the container.

Returns: Iterator to the first element.

If the container is empty, the returned iterator will be equal to end().

Complexity

Constant.

Exceptions

No-throw guarantee.

◆ cbegin()

template<std::ranges::viewable_range inner_type>

const_iterator seqan3::gap_decorator< inner_type >::cbegin ( ) const

inlinenoexcept

Returns an iterator to the first element of the container.

Returns: Iterator to the first element.

If the container is empty, the returned iterator will be equal to end().

Complexity

Constant.

Exceptions

No-throw guarantee.

◆ cend()

template<std::ranges::viewable_range inner_type>

const_iterator seqan3::gap_decorator< inner_type >::cend ( ) const

inlinenoexcept

Returns an iterator pointing behind the last element of the decorator.

Returns: Iterator pointing behind the last element.

Attention: This element acts as a placeholder; attempting to dereference it results in undefined behaviour.

Complexity

Constant.

Exceptions

No-throw guarantee.

◆ end()

template<std::ranges::viewable_range inner_type>

const_iterator seqan3::gap_decorator< inner_type >::end ( ) const

inlinenoexcept

Returns an iterator pointing behind the last element of the decorator.

Returns: Iterator pointing behind the last element.

Attention: This element acts as a placeholder; attempting to dereference it results in undefined behaviour.

Complexity

Constant.

Exceptions

No-throw guarantee.

◆ erase_gap() [1/2]

template<std::ranges::viewable_range inner_type>

iterator seqan3::gap_decorator< inner_type >::erase_gap	(	const_iterator const	first,
		const_iterator const	last
	)

inline

Erase gap symbols at the iterator postions [first, last[.

Parameters

[in]	first	The iterator pointing to the position where to start inserting gaps.
[in]	last	The iterator pointing to the position where to stop erasing gaps.

Returns: Iterator following the last removed element.

Exceptions

seqan3::gap_erase_failure if [first, last[ does not correspond to a consecutive range of seqan3::gap 's.

Complexity

$O(\log k)$

◆ erase_gap() [2/2]

template<std::ranges::viewable_range inner_type>

iterator seqan3::gap_decorator< inner_type >::erase_gap ( const_iterator const it )

inline

Erase one gap symbol at the indicated iterator postion.

Parameters

it	Iterator indicating the gap to be erased.

Returns: Iterator following the last removed element.

Exceptions

seqan3::gap_erase_failure if character is no seqan3::gap.

Complexity

$O(\log k)$

◆ insert_gap()

template<std::ranges::viewable_range inner_type>

iterator seqan3::gap_decorator< inner_type >::insert_gap	(	const_iterator const	it,
		size_type const	count = `1`
	)

inline

Insert a gap of length count at the aligned sequence iterator position.

Parameters

it	Iterator indicating the gap start position in the aligned sequence.
count	Number of gap symbols to be inserted.

Returns: An iterator pointing to the start position of the insertion.

Complexity

Average and worst case (insertion before last gap): $O(k)$ , Best case (back insertion): $O(\log k)$ .

◆ operator[]()

template<std::ranges::viewable_range inner_type>

constexpr reference seqan3::gap_decorator< inner_type >::operator[] ( size_type const i ) const

inlineconstexprnoexcept

Return the i-th element as a reference.

Parameters

i	The element to retrieve.

Returns: A reference of the gapped alphabet type.

This function delegates to an iterator seqan3::gap_decorator.

Complexity

$O(\log k)$ where $k$ is the number of gaps.

◆ size()

template<std::ranges::viewable_range inner_type>

size_type seqan3::gap_decorator< inner_type >::size ( ) const

inlinenoexcept

Returns the total length of the aligned sequence.

Returns: The total length of the aligned sequence (gaps included).

Complexity

Constant.

Exceptions

No-throw guarantee.

Friends And Related Function Documentation

◆ assign_unaligned() [1/2]

void assign_unaligned	(	aligned_seq_t &	aligned_seq,
		unaligned_sequence_type &&	unaligned_seq
	)

Template Parameters

aligned_seq_t	Type of the container to reassign; must model seqan3::aligned_sequence.
unaligned_seq_t	Type of the container to assign from; must correspond to the aligned type without gap information (see details.)

Parameters

[in,out]	aligned_seq	The gapped sequence container to assign to.
[in,out]	unaligned_seq	The unaligned sequence container to assign from.

An aligned sequence has to be assignable from its unaligned counter part. For example a std::vector<seqan3::gapped<seqan3::dna4>> as well as a seqan3::gap_decorator<std::vector<seqan3::dna4>> can be assigned from s std::vector<seqan3::dna4> via seqan3::assign_unaligned.

Attention: This is a concept requirement, not an actual function (however types modelling this concept will provide an implementation).

◆ assign_unaligned [2/2]

template<std::ranges::viewable_range inner_type>

template<typename unaligned_seq_t >

void assign_unaligned	(	gap_decorator< inner_type > &	dec,
		unaligned_seq_t &&	unaligned
	)

friend

Assigns a new sequence of type seqan3::gap_decorator::unaligned_seq_type to the decorator.

Parameters

[in,out]	dec	The decorator to modify.
[in]	unaligned	The unaligned sequence to assign.

◆ erase_gap() [1/2]

std::ranges::iterator_t< aligned_seq_t > erase_gap	(	aligned_seq_t &	aligned_seq,
		typename aligned_seq_t::const_iterator	first,
		typename aligned_seq_t::const_iterator	last
	)

Template Parameters

aligned_seq_t Type of the range to modify; must model seqan3::aligned_sequence.

Parameters

[in,out]	aligned_seq	The aligned sequence to modify.
[in]	first	The iterator pointing to the position where to start erasing gaps.
[in]	last	The iterator pointing to the position where to stop erasing gaps.

Returns: An iterator following the last removed element. If the iterator last refers to the last element, the std::ranges::end() iterator is returned.

Exceptions

seqan3::gap_erase_failure if one of the characters in [first, last) no seqan3::gap.

Note: This may cause reallocations and thus invalidates all iterators and references. Use the returned iterator.

Attention: This is a concept requirement, not an actual function (however types modelling this concept will provide an implementation).

◆ erase_gap() [2/2]

std::ranges::iterator_t< aligned_seq_t > erase_gap	(	aligned_seq_t &	aligned_seq,
		typename aligned_seq_t::const_iterator	pos_it
	)

Template Parameters

aligned_seq_t Type of the range to modify; must model seqan3::aligned_sequence.

Parameters

[in,out]	aligned_seq	The aligned sequence to modify.
[in]	pos_it	The iterator pointing to the position where to erase a gap.

Returns: An iterator following the removed element. If the iterator pos_it refers to the last element, the std::ranges::end() iterator is returned.

Exceptions

seqan3::gap_erase_failure if there is no seqan3::gap at pos_it.

Note: This may cause reallocations and thus invalidates all iterators and references. Use the returned iterator.

Attention: This is a concept requirement, not an actual function (however types modelling this concept will provide an implementation).

◆ insert_gap() [1/2]

std::ranges::iterator_t< aligned_seq_t > insert_gap	(	aligned_seq_t &	aligned_seq,
		typename aligned_seq_t::const_iterator	pos_it
	)

Template Parameters

aligned_seq_t Type of the range to modify; must model seqan3::aligned_sequence.

Parameters

[in,out]	aligned_seq	The aligned sequence to modify.
[in]	pos_it	The iterator pointing to the position where to insert a gap.

Returns: An iterator pointing to the inserted gap.

Note: This may cause reallocations and thus invalidates all iterators and references. Use the returned iterator.

Attention: This is a concept requirement, not an actual function (however types modelling this concept will provide an implementation).

◆ insert_gap() [2/2]

std::ranges::iterator_t< aligned_seq_t > insert_gap	(	aligned_seq_t &	aligned_seq,
		typename aligned_seq_t::const_iterator	pos_it,
		typename aligned_seq_t::size_type	size
	)

Template Parameters

aligned_seq_t Type of the range to modify; must model seqan3::aligned_sequence.

Parameters

[in,out]	aligned_seq	The aligned sequence to modify.
[in]	pos_it	The iterator pointing to the position where to insert a gaps.
[in]	size	The number of gap symbols to insert (will result in a gap of length `size`).

Returns: An iterator pointing to the first inserted gap or pos_it if size == 0.

Note: This may cause reallocations and thus invalidates all iterators and references. Use the returned iterator.

Attention: This is a concept requirement, not an actual function (however types modelling this concept will provide an implementation).

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

seqan3/range/decorator/gap_decorator.hpp

Classes

Public Types

Public Member Functions

Friends

Complexity

Exceptions

Related Functions

Aligned sequence modifications

Detailed Description

template<std::ranges::viewable_range inner_type> class seqan3::gap_decorator< inner_type >

Performance

Implementation details

The seqan3::gap_decorator::iterator type

Member Function Documentation

◆ at() [1/2]

Complexity

Exceptions

◆ at() [2/2]

Complexity

Exceptions

◆ begin()

Complexity

Exceptions

◆ cbegin()

Complexity

Exceptions

◆ cend()

Complexity

Exceptions

◆ end()

Complexity

Exceptions

◆ erase_gap() [1/2]

Complexity

◆ erase_gap() [2/2]

Complexity

◆ insert_gap()

Complexity

◆ operator[]()

Complexity

◆ size()

Complexity

Exceptions

Friends And Related Function Documentation

◆ assign_unaligned() [1/2]

◆ assign_unaligned [2/2]

◆ erase_gap() [1/2]

◆ erase_gap() [2/2]

◆ insert_gap() [1/2]

◆ insert_gap() [2/2]

template<std::ranges::viewable_range inner_type>
class seqan3::gap_decorator< inner_type >