71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/*!
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* \file /utl/impl/concepts/iterators.h
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* \brief utl iterator concept support header
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*
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* Copyright (C) 2018 Christos Choutouridis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __utl_concepts_iterator_h__
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#define __utl_concepts_iterator_h__
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#include <utl/core/impl.h>
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#include <utl/concepts/defines.h>
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#include <utl/concepts/stl.h>
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/*!
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* \ingroup concepts
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* \defgroup iterators
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*/
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//! @{
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namespace utl {
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#if CXX_CONCEPTS
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template <class I>
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_utlConcept WeaklyIncrementable =
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Semiregular<I> &&
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requires(I i) {
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{ ++i } -> Same<I>&; // not required to be equality preserving
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i++; // not required to be equality preserving
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};
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#else
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namespace detail {
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template <typename I> using try_ppI = decltype (++(std::declval<I>()));
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template <typename I> using try_Ipp = decltype (std::declval<I>()++);
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}
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template <class I>
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_utlConcept WeaklyIncrementable =
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Semiregular<I>
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&& Same<_ref_t<I>, meta::detected_t<detail::try_ppI, _ref_t<I>>>
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&& meta::is_detected<detail::try_Ipp, _ref_t<I>>::value;
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#endif
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#if CXX_CONCEPTS
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template <class I>
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_utlConcept DeviceIterator =
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requires(I i) {
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{ *i } -> auto&&; // Requires: i is dereferenceable
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} &&
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WeaklyIncrementable<I>;
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#else
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#endif
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}
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//! @}
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#endif /* __utl_concepts_iterator_h__ */
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