mirror of
https://github.com/triqs/dft_tools
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113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2012-2013 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_ARRAYS_CACHE_H
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#define TRIQS_ARRAYS_CACHE_H
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#include "./array.hpp"
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#include <triqs/utility/view_tools.hpp>
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#include <triqs/utility/c14.hpp>
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namespace triqs {
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namespace arrays {
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// ----------------- the implementation class -----------------------
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template <typename DataType, bool IsConst> class cache_impl {
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protected:
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typedef memory_layout<DataType::domain_type::rank> ml_t;
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ml_t ml;
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std::c14::conditional_t<IsConst, typename const_view_type_if_exists_else_type<DataType>::type,
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typename view_type_if_exists_else_type<DataType>::type> keeper;
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bool need_copy;
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using CacheType = array<typename DataType::value_type, DataType::domain_type::rank>;
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using exposed_view_type = std::c14::conditional_t<IsConst, typename CacheType::const_view_type, typename CacheType::view_type>;
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struct internal_data {
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CacheType copy;
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exposed_view_type view;
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internal_data(cache_impl const& P, ml_t ml) : copy(CacheType(P.keeper, ml)), view(copy) {
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#ifdef TRIQS_ARRAYS_CACHE_COPY_VERBOSE
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std::cerr << " Cache : copy made " << std::endl << " -- TRACE = --" << std::endl << triqs::utility::stack_trace()
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<< std::endl;
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#endif
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}
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};
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friend struct internal_data;
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mutable std::shared_ptr<internal_data> _id;
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internal_data& id() const {
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if (!_id) _id = std::make_shared<internal_data>(*this, ml);
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return *_id;
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}
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// avoid compiling the transformation keeper-> exposed_view_type when it does not make sense, e.g. expressions
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exposed_view_type view1(std::true_type) const {
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if (need_copy)
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return id().view;
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else
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return keeper;
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}
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exposed_view_type view1(std::false_type) const { return id().view; }
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exposed_view_type view2() const { return view1(bool_constant<is_amv_value_or_view_class<DataType>::value>()); }
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bool need_copy_dynamic(DataType const& x, std::false_type) const { return false; }
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bool need_copy_dynamic(DataType const& x, std::true_type) const { return (x.indexmap().memory_indices_layout() != ml); }
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void back_update(std::true_type) {}
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void back_update(std::false_type) {
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if (need_copy) keeper = id().view;
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}
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public:
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cache_impl(DataType const& x, ml_t ml_ = ml_t()) : ml(ml_), keeper(x) {
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need_copy = (!is_amv_value_or_view_class<DataType>::value) || need_copy_dynamic(x, is_amv_value_or_view_class<DataType>()) ||
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(!has_contiguous_data(x));
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}
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~cache_impl() { back_update(bool_constant< IsConst>()); }
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cache_impl(cache_impl &&) = default;
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cache_impl(cache_impl const&) = delete;
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cache_impl& operator =(cache_impl const&) = delete;
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cache_impl& operator =(cache_impl &&) = delete;
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void update() {
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if (need_copy && _id) id().view = keeper;
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}
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exposed_view_type view() const { return view2(); }
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operator exposed_view_type() const { return view2(); }
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};
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// ---------------- Users class and factories ------------------
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template <typename DataType> using cache = cache_impl<DataType, false>;
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template <typename DataType> using const_cache = cache_impl<DataType, true>;
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template <typename D>
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const_cache<D> make_const_cache(D const& x, memory_layout<D::domain_type::rank> ml = memory_layout<D::domain_type::rank>{'C'}) {
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return {x, ml};
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}
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template <typename D>
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cache<D> make_cache(D const& x, memory_layout<D::domain_type::rank> ml = memory_layout<D::domain_type::rank>{'C'}) {
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return {x, ml};
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}
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}
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} // namespace triqs::arrays
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#endif
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