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

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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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