mirror of
https://github.com/triqs/dft_tools
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49 lines
2.8 KiB
C++
49 lines
2.8 KiB
C++
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/*******************************************************************************
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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 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_INDEXMAP_STORAGE_ORDER_H
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#define TRIQS_ARRAYS_INDEXMAP_STORAGE_ORDER_H
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#include "./mem_layout.hpp"
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namespace triqs { namespace arrays { namespace indexmaps { namespace cuboid { namespace slicing_TO_order {
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template <typename... SliceArgs> struct _impl{
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static constexpr int n_range_ellipsis=0;
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static constexpr ull_t mask(ull_t mo, int P, int c) { return 0;}
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static constexpr ull_t smo (ull_t mo, ull_t ma, int P, int c) { return 0;}
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};
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template <typename A0, typename... SliceArgs> struct _impl< A0,SliceArgs...> {
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typedef _impl<SliceArgs...> next_t;
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static constexpr bool is_range = std::is_base_of<range, A0>::value; // range and ellipsis (derived from range)
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static constexpr int n_range_ellipsis= next_t::n_range_ellipsis + is_range;
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static constexpr ull_t mask(ull_t mo, int P=0, int c=0) { return ((is_range ? P+1 : 0) << (4*c)) + next_t::mask(mo,P + is_range,c+1);}
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static constexpr ull_t r2 (ull_t mo, ull_t ma, int c) { return (ma >> (4*(permutations::apply(mo,c)))) & 0xF; }
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static constexpr ull_t aux (ull_t mo,ull_t ma,ull_t r,int P,int c) { return (r!=0? ( (r-1) << (4*P)) : 0) + next_t::smo(mo,ma,P+(r!=0), c+1); }
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static constexpr ull_t smo (ull_t mo, ull_t ma, int P=0, int c=0) { return aux(mo,ma,r2(mo,ma,c),P,c); }
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};
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template<typename ... Args>
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constexpr ull_t sliced_memory_order1(ull_t mo) { return _impl<Args...>::n_range_ellipsis + 0x10*_impl<Args...>::smo(mo, _impl<Args...>::mask(mo));}
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template<typename ... Args>
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constexpr ull_t sliced_memory_order2(ull_t mo) { return (mem_layout::is_c (mo) ? c_order(_impl<Args...>::n_range_ellipsis) :
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( mem_layout::is_fortran(mo) ? fortran_order(_impl<Args...>::n_range_ellipsis) : sliced_memory_order1<Args...>(mo) ));
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}
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template<ull_t mo, typename ... Args> struct sliced_memory_order { static constexpr ull_t value = sliced_memory_order1<Args...>(mo); };
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}}}}}//namespace triqs::arrays
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#endif
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