[range.adaptor.helpers] (original) (raw)

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.5 Range adaptor helpers [range.adaptor.helpers]

namespace std::ranges { template<class F, class Tuple> constexpr auto tuple-transform(F&& f, Tuple&& t) { return apply([&]<class... Ts>(Ts&&... elements) { return tuple<invoke_result_t<F&, Ts>...>(invoke(f, std::forward<Ts>(elements))...);}, std::forward<Tuple>(t));} template<class F, class Tuple> constexpr void tuple-for-each(F&& f, Tuple&& t) { apply([&]<class... Ts>(Ts&&... elements) { (static_cast<void>(invoke(f, std::forward<Ts>(elements))), ...);}, std::forward<Tuple>(t));} template<class T> constexpr T& as-lvalue(T&& t) { return static_cast<T&>(t);} template<bool Const, class... Views> concept all-random-access = (random_access_range<_maybe-const_<Const, Views>> && ...);template<bool Const, class... Views> concept all-bidirectional = (bidirectional_range<_maybe-const_<Const, Views>> && ...);template<bool Const, class... Views> concept all-forward = (forward_range<_maybe-const_<Const, Views>> && ...);}