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std::ranges::elements_view<V,F>::iterator<Const>::operator++,--,+=,-=

constexpr /*iterator*/& operator++();
 (1) (since C++20) 
constexpr void operator++( int );
 (2) (since C++20) 
constexpr /*iterator*/ operator++( int )
  requires ranges::forward_range<Base>;
 (3) (since C++20) 
constexpr /*iterator*/& operator--()
  requires ranges::bidirectional_range<Base>;
 (4) (since C++20) 
constexpr /*iterator*/ operator--( int )
  requires ranges::bidirectional_range<Base>;
 (5) (since C++20) 
constexpr /*iterator*/& operator+=( difference_type n )
  requires ranges::random_access_range<Base>;
 (6) (since C++20) 
constexpr /*iterator*/& operator-=( difference_type n )
  requires ranges::random_access_range<Base>;
 (7) (since C++20)

Increments or decrements the iterator.

Let current_ be the underlying iterator.

1) Equivalent to ++current_; return *this;
2) Equivalent to ++current_;
3) Equivalent to auto tmp = *this; ++*this; return tmp;
4) Equivalent to --current_; return *this;
5) Equivalent to auto tmp = *this; --*this; return tmp;
6) Equivalent to current_ += n; return *this;
7) Equivalent to current_ -= n; return *this;

Parameters

n - position relative to current location

Return value

1,4,6,7) *this
2) (none)
3,5) a copy of *this that was made before the change

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