mirror of
https://github.com/triqs/dft_tools
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53 lines
2.1 KiB
C++
53 lines
2.1 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) 2011 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_MEMCOPY_H
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#define TRIQS_MEMCOPY_H
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#include "../../utility/exceptions.hpp"
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namespace triqs { namespace arrays { namespace storages {
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// beware : complex is not a pod
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template <class S> struct is_scalar_or_pod : std::integral_constant<bool, std::is_arithmetic<S>::value || boost::is_complex<S>::value || std::is_pod<S>::value > {};
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// copy such that it is a fast memcpy for scalar / pod objects
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// when not a scalar object, loop on elements
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template<typename T1, typename T2>
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void memcopy_impl (T1 * restrict p1, const T2 * restrict p2, size_t size, std::false_type) { for (size_t i = 0; i < size; ++i) p1[i] = p2[i]; }
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template<typename T>
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void memcopy_impl (T * restrict p1, const T * restrict p2, size_t size, std::true_type) {
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if (std::abs(p2-p1)>size) {memcpy (p1, p2, size * sizeof(T));} // guard against aliasing of data
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else { memcopy_impl(p1,p2,size,std::false_type());}
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}
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template<typename T1, typename T2>
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void memcopy (T1 * restrict p1, const T2 * restrict p2, size_t size) {
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constexpr bool use_memcpy = std::is_pod<T1>::value &&
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std::is_same< typename std::remove_cv<T1>::type, typename std::remove_cv<T2>::type>::value;
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memcopy_impl(p1,p2,size,std::integral_constant<bool, use_memcpy>());
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}
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}}}
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#endif
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