23 Ranges library [ranges]

23.5 Range utilities [range.utility]

23.5.2 View interface [view.interface]

23.5.2.1 Members [view.interface.members]

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constexpr decltype(auto) front() requires ForwardRange<D>; constexpr decltype(auto) front() const requires ForwardRange<const D>;
1
#
Expects: !empty().
2
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Effects: Equivalent to: return *ranges::begin(derived());
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constexpr decltype(auto) back() requires BidirectionalRange<D> && CommonRange<D>; constexpr decltype(auto) back() const requires BidirectionalRange<const D> && CommonRange<const D>;
3
#
Expects: !empty().
4
#
Effects: Equivalent to: return *ranges::prev(ranges::end(derived()));