# std::ranges::slide_view<V>::iterator<Const>::operator++,--,+=,-=

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constexpr /*iterator*/& operator++(); | (1) | (since C++23)
constexpr /*iterator*/ operator++( int ); | (2) | (since C++23)
constexpr /*iterator*/& operator--() requires ranges::bidirectional_range <Base>; | (3) | (since C++23)
constexpr /*iterator*/ operator--( int ) requires ranges::bidirectional_range <Base>; | (4) | (since C++23)
constexpr /*iterator*/& operator+=( difference_type n ) requires ranges::random_access_range <Base>; | (5) | (since C++23)
constexpr /*iterator*/& operator-=( difference_type n ) requires ranges::random_access_range <Base>; | (6) | (since C++23)

Advances or decrements the iterator.

Let `current_` and `last_ele_` be the underlying iterators to the begin and end of the sliding window.

1) Equivalent to:

    current_ = ranges::next(current_);
    last_ele_ = ranges::next(last_ele_); // if last_ele_ is present
    return *this;

Before the invocation, the `current_` and `last_ele_` (if present) must be incrementable.
2) Equivalent to: auto tmp = *this; ++*this; return tmp;
3) Equivalent to:

    current_ = ranges::prev(current_);
    last_ele_ = ranges::prev(last_ele_); // if last_ele_ is present
    return *this;

Before the invocation, the `current_` and `last_ele_` (if present) must be decrementable.
4) Equivalent to: auto tmp = *this; --*this; return tmp;
5) Equivalent to:

    current_ = current_ + n;
    last_ele_ = last_ele_ + n; // if last_ele_ is present
    return *this;

Before the invocation, the expressions current_ + n and last_ele_ + n (if `last_ele_` is present) must have well-defined behavior.
6) Equivalent to:

    current_ = current_ - n;
    last_ele_ = last_ele_ - n; // if last_ele_ is present
    return *this;

Before the invocation, the expressions current_ - n and last_ele_ - n (if `last_ele_` is present) must have well-defined behavior.

### Parameters

n | - | position relative to current location

### Return value

1,3,5,6) *this
2,4) a copy of *this that was made before the change

### Example

| This section is incomplete Reason: no example

### See also

operator+operator- (C++23) | performs iterator arithmetic (function)

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