std::experimental::ranges::Range

Technical Specification
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
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Defined in header `<experimental/ranges/range>`
template< class T > concept bool Range = requires(T&& t) { ranges::begin(t); /* not necessarily equality-preserving (see below) */ ranges::end(t); };		(ranges TS)

Given an lvalue t of type std::remove_reference_t<T>, Range<T> is satisfied only if

[ranges::begin(t), ranges::end(t)) denotes a range; and
both ranges::begin(t) and ranges::end(t) are amortized constant time and non-modifying.
If ranges::iterator_t<T> satisfies ForwardIterator, ranges::begin(t) is equality preserving.

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