mirror of
https://github.com/triqs/dft_tools
synced 2024-12-26 06:14:14 +01:00
53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
/*******************************************************************************
|
|
*
|
|
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
|
|
*
|
|
* Copyright (C) 2011 by O. Parcollet
|
|
*
|
|
* TRIQS is free software: you can redistribute it and/or modify it under the
|
|
* terms of the GNU General Public License as published by the Free Software
|
|
* Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
******************************************************************************/
|
|
#ifndef TRIQS_MEMCOPY_H
|
|
#define TRIQS_MEMCOPY_H
|
|
#include "../../utility/exceptions.hpp"
|
|
|
|
namespace triqs { namespace arrays { namespace storages {
|
|
|
|
// beware : complex is not a pod
|
|
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 > {};
|
|
|
|
// copy such that it is a fast memcpy for scalar / pod objects
|
|
// when not a scalar object, loop on elements
|
|
|
|
template<typename T1, typename T2>
|
|
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]; }
|
|
|
|
template<typename T>
|
|
void memcopy_impl (T * restrict p1, const T * restrict p2, size_t size, std::true_type) {
|
|
if (std::abs(p2-p1)>size) {memcpy (p1, p2, size * sizeof(T));} // guard against aliasing of data
|
|
else { memcopy_impl(p1,p2,size,std::false_type());}
|
|
}
|
|
|
|
template<typename T1, typename T2>
|
|
void memcopy (T1 * restrict p1, const T2 * restrict p2, size_t size) {
|
|
constexpr bool use_memcpy = std::is_pod<T1>::value &&
|
|
std::is_same< typename std::remove_cv<T1>::type, typename std::remove_cv<T2>::type>::value;
|
|
memcopy_impl(p1,p2,size,std::integral_constant<bool, use_memcpy>());
|
|
}
|
|
|
|
}}}
|
|
#endif
|
|
|
|
|