operator+,-(ranges::transform_view::iterator)

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< cpp‎ | ranges‎ | transform view‎ | iterator
C++
Ranges library
Range adaptors
std::ranges::transform_view
Member functions
Deduction guides
Iterator
operator+(transform_view::iterator)
operator-(transform_view::iterator)
Sentinel
friend constexpr /*iterator*/ operator+ ( /*iterator*/ i, difference_type n )
    requires ranges::random_access_range <Base> ;
(1) (since C++20)
friend constexpr /*iterator*/ operator+ ( difference_type n, /*iterator*/ i )
    requires ranges::random_access_range <Base> ;
(2) (since C++20)
friend constexpr /*iterator*/ operator- ( /*iterator*/ i, difference_type n )
    requires ranges::random_access_range <Base> ;
(3) (since C++20)
friend constexpr difference_type operator- ( const /*iterator*/ & x,

const /*iterator*/ & y )
    requires std::sized_sentinel_for < ranges::iterator_t <Base>,

ranges::iterator_t <Base>> ;
(4) (since C++20)
1,2) Returns the iterator i incremented by n.
3) Returns the iterator i decremented by n.
4) Returns the distance between x and y.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when transform_view::iterator<Const>

Parameters

i, x, y - the iterators.
n - position relative to current location.

Return value

Let parent_ denote the pointer to the parent transform_view, current_ denote the underlying iterator.

1,2) /*iterator*/ { *i.parent_, i.current_ + n}
3) /*iterator*/ { *i.parent_, i.current_ - n}
4) x.current_ - y.current_

Example

This section is incomplete
Reason: no example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 3483 C++20 transform_view::iterator's difference is overconstrained requirement is relaxed
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