std::ranges::lazy_split_view<V, Pattern>::inner_iterator

 

C++

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Standard library headers

Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

Range conversions std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

Dangling iterator handling dangling borrowed_iterator_t borrowed_subrange_t

Range primitives
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

Range concepts
range borrowed_range    common_range	sized_range viewable_range    view	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	approximately_sized_range (C++26) constant_range (C++23)

Views
view_interface	subrange

Range factories
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

Range adaptors
views::all_tviews::all as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while common_viewviews::common views::counted to_input_viewviews::to_input (C++26)(C++26)	ref_view drop_viewviews::drop drop_while_viewviews::drop_while lazy_split_viewviews::lazy_split split_viewviews::split join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   concat_viewviews::concat (C++26)(C++26) cache_latest_viewviews::cache_latest (C++26)(C++26)	owning_view reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)

Range generators std::generator (C++23)

Range adaptor closure objects range_adaptor_closure (C++23)

Range adaptor objects

Helper items
copyable-box movable-box (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::lazy_split_view

Member functions

lazy_split_view::lazy_split_view

lazy_split_view::base

lazy_split_view::begin

lazy_split_view::end

Nested classes

lazy_split_view::outer_iterator

lazy_split_view::outer_iterator::value_type

lazy_split_view::inner_iterator

Deduction guides

 

template<bool Const > struct/*inner_iterator*/;		(since C++20) (exposition only*)

The return type of lazy_split_view::outer_iterator::value_type::begin().

Const matches the template argument of outer_iterator.

Member types

Member	Definition
Base	maybe-const <Const, V> (exposition-only member type*)
iterator_concept	outer_iterator<Const>::iterator_concept, that is std::forward_iterator_tag, if Base models forward_range. std::input_iterator_tag, otherwise.
iterator_category (conditionally present)	Present only if Base models forward_range. std::forward_iterator_tag if std::iterator_traits<ranges::iterator_t<Base>>::iterator_category models std::derived_from<std::forward_iterator_tag>. std::iterator_traits<ranges::iterator_t<Base>>::iterator_category otherwise.
value_type	ranges::range_value_t<Base>
difference_type	ranges::range_difference_t<Base>

Data members

Member	Description
outer_iterator<Const>i_(private)	an iterator into the underlying view of the parent object lazy_split_view (exposition-only member object*)
boolincremented_(private)	a flag that indicates whether the operator++ was invoked on this object at least once (exposition-only member object*)

Member functions

(constructor) (C++20)	constructs an iterator (public member function)
base (C++20)	returns the underlying iterator (public member function)
operator* (C++20)	returns the current element (public member function)
operator++operator++(int) (C++20)	advances the iterator (public member function)

Member functions

std::ranges::lazy_split_view::inner_iterator::inner_iterator

/*inner_iterator*/()=default;	(1)	(since C++20)
constexprexplicit/*inner_iterator*/(/*outer_iterator*/<Const> i );	(2)	(since C++20)

1) Value initializes data member i_ via its default member initializer (= /*outer_iterator*/<Const>()).

2) Initializes i_ with std::move(i).

The data member incremented_ is initialized with its default member initializer to false.

std::ranges::lazy_split_view::inner_iterator::base

constexprconstranges::iterator_t<Base>& base()const&noexcept;	(1)	(since C++20)
constexprranges::iterator_t<Base> base()&&     requires ranges::forward_range<V>;	(2)	(since C++20)

Returns a copy of the underlying iterator.

1) Copy constructs the result from the underlying iterator. Equivalent to return i_./*cur*/();.

2) Move constructs the result from the underlying iterator. Equivalent to return std::move(i_./*cur*/());.

std::ranges::lazy_split_view::inner_iterator::operator*

constexpr decltype(auto) operator*()const;		(since C++20)

Returns the element the underlying iterator points to.

Equivalent to return*i_./*cur*/();.

std::ranges::lazy_split_view::inner_iterator::operator++

constexpr/*inner_iterator*/& operator++();	(1)	(since C++20)
constexpr decltype(auto) operator++(int);	(2)	(since C++20)

1) The function body is equivalent to
incremented_ =true;

ifconstexpr(!ranges::forward_range<Base>)
{
    ifconstexpr(Pattern::size()==0)
        return*this;
}
++i_./*cur*/();

return*this;

2) Equivalent to
ifconstexpr(ranges::forward_range<Base>)

{
    auto tmp =*this;
    ++*this;
    return tmp;
}
else
    ++*this;// no return statement

Non-member functions

operator== (C++20)	compares the iterators or the iterator and std::default_sentinel (function)
iter_move (C++20)	casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function)
iter_swap (C++20)	swaps the objects pointed to by two underlying iterators (function)

operator==(std::ranges::split_view::inner_iterator)

friendconstexprbool operator==(const/*inner_iterator*/& x,                                   const/*inner_iterator*/& y )       requires forward_range<Base>;	(1)	(since C++20)
friendconstexprbool operator==(const/*inner_iterator*/& x,                                   std::default_sentinel_t);	(2)	(since C++20)

1) Equivalent to return x.i_./*cur*/()== y.i_./*cur*/();.

2) The function body is equivalent to

auto[pcur, pend]=ranges::subrange{x.i_.parent_->pattern_};auto end =ranges::end(x.i_.parent_->base_);ifconstexpr(/*tiny_range*/<Pattern>){constauto& cur = x.i_./*cur*/();if(cur == end)returntrue;if(pcur == pend)return x.incremented_;return*cur ==*pcur;}else{auto cur = x.i_./*cur*/();if(cur == end)returntrue;if(pcur == pend)return x.incremented_;do{if(*cur !=*pcur)returnfalse;if(++pcur == pend)returntrue;}while(++cur != end);returnfalse;}

The != operator is synthesized from operator==.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::ranges::split_view::inner_iterator is an associated class of the arguments.

iter_move(std::ranges::split_view::inner_iterator)

friendconstexpr decltype(auto) iter_move(const/*inner_iterator*/& i )     noexcept(noexcept(ranges::iter_move(i.i_./*cur*/())));		(since C++20)

Equivalent to returnranges::iter_move(i.i_./*cur*/());.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::ranges::split_view::inner_iterator is an associated class of the arguments.

iter_swap(std::ranges::split_view::inner_iterator)

friendconstexprvoid iter_swap(const/*inner_iterator*/& x,                                  const/*inner_iterator*/& y )     noexcept(noexcept(ranges::iter_swap(x.i_.current, y.i_.current)))     requires std::indirectly_swappable<ranges::iterator_t<Base>>;		(since C++20)

Equivalent to ranges::iter_swap(x.i_./*cur*/(), y.i_./*cur*/()).

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::ranges::split_view::inner_iterator is an associated class of the arguments.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3591	C++20	the && overload of base might invalidate outer iterators	constraints added
LWG 3593	C++20	the const& overload of base returns a reference but might not be noexcept	made noexcept