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deductiongu...es::subrange(3) C++ Standard Libarydeductiongu...es::subrange(3) NAME deductionguidesforstd::ranges::subrange - deductionguides- forstd::ranges::subrange Synopsis Defined in header <ranges> template< std::input_or_output_iterator I, std::sentinel_for<I> S > (1) (since subrange(I, S) -> subrange<I, S>; C++20) template< std::input_or_output_iterator I, std::sentinel_for<I> S > (since subrange(I, S, /*make-unsigned-like-t*/<std::iter_difference_t<I>>) -> (2) C++20) subrange<I, S, ranges::subrange_kind::sized>; template< ranges::borrowed_range<R> > subrange(R&&) -> subrange<ranges::iterator_t<R>, ranges::sentinel_t<R>, (ranges::sized_range<R> || (3) (since std::sized_sentinel_for<ranges::sentinel_t<R>, C++20) ranges::iterator_t<R>>) ? ranges::subrange_kind::sized : ranges::subrange_kind::unsized>; template< ranges::borrowed_range<R> > subrange(R&&, /*make-unsigned-like-t*/<ranges::range_differ- ence_t<R>>) (since -> (4) C++20) subrange<ranges::iterator_t<R>, ranges::sentinel_t<R>, ranges::subrange_kind::sized>; These deduction guides are provided for std::ranges::subrange. 1) Deduces the template arguments from the type of iterator and sen- tinel. The subrange is sized if std::sized_sentinel_for<S, I> is satisfied, as determined by the default template argument. 2) Deduces the template arguments from the type of iterator and sen- tinel, while the size of range is specified. The subrange is always sized. 3) Deduces the template arguments from the type of range. The sub- range is sized if the size can be obtained from the range or its iterator and sen- tinel. 4) Deduces the template arguments from the type of range, while the size of range is specified. The subrange is always sized. The exposition-only alias template make-unsigned-like-t maps each integer-like type to its corresponding unsigned version. Notes While constructing the subrange object, * for (1,2), the behavior is undefined if the iterator-sentinel pair does not denote a valid range, * for (2,4), the behavior is undefined if the given size is not equal to the size of the range. Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 3404 C++20 meaningless deduction guides from pair-like removed types were provided Category: * Todo no example http://cppreference.com 2024.06.10 deductiongu...es::subrange(3)
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