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

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< cpp‎ | ranges‎ | stride view‎ | iterator

constexpr /*iterator*/& operator++(); | (1) | (since C++23)
constexpr void operator++( int ); | (2) | (since C++23)
constexpr /*iterator*/ operator++( int ) requires ranges::forward_range<Base>; | (3) | (since C++23)
constexpr /*iterator*/& operator--() requires ranges::bidirectional_range<Base>; | (4) | (since C++23)
constexpr /*iterator*/ operator--( int ) requires ranges::bidirectional_range<Base>; | (5) | (since C++23)
constexpr /*iterator*/& operator+=( difference_type n ) requires ranges::random_access_range<Base>; | (6) | (since C++23)
constexpr /*iterator*/& operator-=( difference_type n ) requires ranges::random_access_range<Base>; | (7) | (since C++23)

Increments or decrements the iterator.

Let `current_`, `end_`, `stride_`, and `missing_` be the data members of the iterator.

1) Equivalent to

    missing_ = ranges::advance(current_, stride_, end_);
    return *this

Before the call `current_` should not be equal to `end_`.
2) Equivalent to ++*this;.
3) Equivalent to auto tmp = *this; ++*this; return tmp;.
4) Equivalent to

    ranges::advance(current_, missing_ - stride_);
    missing_ = 0;
    return *this;

5) Equivalent to auto tmp = *this; --*this; return tmp;.
6) Equivalent to

    if (n > 0)
    {
        ranges::advance(current_, stride_ * (n - 1));
        missing_ = ranges::advance(current_, stride_, end_);
    }
    else if (n < 0)
    {
        ranges::advance(current_, stride_ * n + missing_);
        missing_ = 0;
    }

    return *this;

If n > 0, then before the call to this function the ranges::distance(current_, end_) must be greater than stride_ * (n - 1).

Note that if n < 0, the ranges::distance(current_, end_) is always greater than (non-positive) stride_ * (n - 1).
7) Equivalent to return *this += -n;

### 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

### Example

| This section is incomplete Reason: no example

### See also

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

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