NAME¶

std::experimental::ranges::distance - std::experimental::ranges::distance

Synopsis¶

Defined in header <experimental/ranges/iterator>
namespace {
(ranges TS)
constexpr /* unspecified */ distance = /* unspecified */; (customization
point object)
}
Call signature
template< Iterator I, Sentinel<I> S >
constexpr ranges::difference_type_t<I> distance( I first, S last (1)
);
template< Range R >
constexpr ranges::difference_type_t<ranges::iterator_t<R>> (2)
distance( R&& r );
template< SizedRange R >
constexpr ranges::difference_type_t<ranges::iterator_t<R>> (3)
distance( R&& r );

Returns the distance between first and last, or between the beginning and the end of
the range r.

1) If SizedSentinel<S, I> is satisfied, equivalent to return last - first;.
Otherwise, returns the number of increments needed to get from first to last. If
[first, last) does not denote a range, then I and S must be the same type and must
model SizedSentinel, and [last, first) must denote a range. Otherwise, the behavior
is undefined.
2) Equivalent to return ranges::distance(ranges::begin(r), ranges::end(r));.
3) Equivalent to return ranges::size(r);.

Instantiating overloads (2,3) may be ill-formed if the header
<experimental/ranges/range> is not included before the point of instantiation.

Return value¶

The distance between first and last, or between the beginning and the end of the
range r.

Example¶

This section is incomplete
Reason: no example

See also¶

distance returns the distance between two iterators
(function template)
advance advances an iterator by given distance
(function template)
next increment an iterator
(function template)
prev decrement an iterator
(function template)
size obtains the size of a range whose size can be calculated in constant time
(customization point object)

Category:¶

* Todo no example