24 Ranges library [ranges]

24.5 Range utilities [range.utility]

24.5.2 View interface [view.interface]

24.5.2.1 Members [view.interface.members]

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constexpr decltype(auto) front() requires forward_­range<D>; constexpr decltype(auto) front() const requires forward_­range<const D>;
1
#
Preconditions: !empty().
2
#
Effects: Equivalent to: return *ranges​::​begin(derived());
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constexpr decltype(auto) back() requires bidirectional_­range<D> && common_range<D>; constexpr decltype(auto) back() const requires bidirectional_­range<const D> && common_range<const D>;
3
#
Preconditions: !empty().
4
#
Effects: Equivalent to: return *ranges​::​prev(ranges​::​end(derived()));