std::ranges::join_view<V>::iterator<Const>::operator++,--

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< cpp‎ | ranges‎ | join view‎ | iterator
C++
Ranges library
Range adaptors
std::ranges::join_view
constexpr /*iterator*/ & operator++ ( ) ;
(1) (since C++20)
constexpr void operator++ ( int ) ;
(2) (since C++20)
constexpr /*iterator*/ operator++ ( int )

requires /*ref-is-glvalue*/ && ranges::forward_range <Base> &&

ranges::forward_range < ranges::range_reference_t <Base>> ;
(3) (since C++20)
constexpr iterator& operator-- ( )

requires /*ref-is-glvalue*/ && ranges::bidirectional_range <Base> &&
ranges::bidirectional_range < ranges::range_reference_t <Base>> &&

ranges::common_range < ranges::range_reference_t <Base>> ;
(4) (since C++20)
constexpr /*iterator*/ operator-- ( int )

requires /*ref-is-glvalue*/ && ranges::bidirectional_range <Base> &&
ranges::bidirectional_range < ranges::range_reference_t <Base>> &&

ranges::common_range < ranges::range_reference_t <Base>> ;
(5) (since C++20)

Increments or decrements the underlying iterator.

Let inner_ and outer_ be the underlying iterators, and parent_ be the pointer to parent ranges::join_view, the constant /*ref-is-glvalue*/ be std::is_reference_v < ranges::range_reference_t <Base>>

1) Let /*inner-range*/ be:
  • *outer_, if /*ref-is-glvalue*/ == true
  • *parent_->inner_ otherwise.

Equivalent to: 

auto&& inner_rng = /*inner-range*/;
if (++inner_ == ranges::end(inner_rng))
{
    ++outer_;
    satisfy();
}
return *this;
2) Equivalent to: ++*this.
3) Equivalent to: 
auto tmp = *this;
++*this;
return tmp;
4) Equivalent to: 
if (outer_ == ranges::end(parent_->base_))
    inner_ = ranges::end(*--outer_);
while (inner_ == ranges::begin(*outer_))
    inner_ = ranges::end(*--outer_);
--inner_;
return *this;
5) Equivalent to: 
auto tmp = *this;
--*this;
return tmp;

Parameters

(none)

Return value

1,4) *this
2) (none)
3,5) a copy of *this that was made before the change.
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