25 Ranges library [ranges]

25.5 Range utilities [range.utility]

25.5.3 View interface [view.interface]

25.5.3.2 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() is true.
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() is true.
4
#
Effects: Equivalent to: return *ranges​::​prev(ranges​::​end(derived()));