mirror of
https://github.com/triqs/dft_tools
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72 lines
3.5 KiB
C++
72 lines
3.5 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) 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_UTILITY_VIEWTOOLS_H
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#define TRIQS_UTILITY_VIEWTOOLS_H
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#include <functional>
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namespace triqs {
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// keep old solution for a while to check portability and then remove tag
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#define TRIQS_DETECT_VIEWS
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#ifdef TRIQS_DETECT_VIEWS
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template<typename T> void nop(T ...){};
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template<typename T, typename Enable=void> struct has_view : std::false_type {};
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template<typename T> struct has_view<T, decltype(nop(std::declval<typename T::view_type>(),std::declval<typename T::non_view_type>()))> : std::true_type {};
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template<typename T, bool HasView = has_view<T>::value> struct non_view_type_if_exists_else_type;
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template<typename T> struct non_view_type_if_exists_else_type<T,false> {typedef T type;};
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template<typename T> struct non_view_type_if_exists_else_type<T,true > {typedef typename T::non_view_type type;};
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template<typename T, bool HasView = has_view<T>::value> struct view_type_if_exists_else_type;
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template<typename T> struct view_type_if_exists_else_type<T,false> {typedef T type;};
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template<typename T> struct view_type_if_exists_else_type<T,true > {typedef typename T::view_type type;};
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template<typename T, bool HasView = has_view<T>::value> struct const_view_type_if_exists_else_type;
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template<typename T> struct const_view_type_if_exists_else_type<T,false> {typedef T type;};
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template<typename T> struct const_view_type_if_exists_else_type<T,true> {typedef const typename T::view_type type;};
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// template<typename T> struct const_view_type_if_exists_else_type<const T, typename T::has_view_type_tag> {typedef const typename T::view_type type;};
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#else
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template<typename T, typename Void =void> struct non_view_type_if_exists_else_type {typedef T type;};
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template<typename T> struct non_view_type_if_exists_else_type<T, typename T::has_view_type_tag> {typedef typename T::non_view_type type;};
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template<typename T, typename Void =void> struct view_type_if_exists_else_type {typedef T type;};
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template<typename T> struct view_type_if_exists_else_type<T, typename T::has_view_type_tag> {typedef typename T::view_type type;};
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template<typename T, typename Void =void> struct const_view_type_if_exists_else_type {typedef T type;};
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template<typename T> struct const_view_type_if_exists_else_type<T, typename T::has_view_type_tag> {typedef const typename T::view_type type;};
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// template<typename T> struct const_view_type_if_exists_else_type<const T, typename T::has_view_type_tag> {typedef const typename T::view_type type;};
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#endif
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// replacement of std::plus for views ...
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template <class T> struct add_views : std::binary_function <T,T,T> {
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T operator() (const T& x, const T& y) const
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{ typename T::non_view_type r(x); r =r + y; return r;}
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};
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}//namespace triqs
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#endif
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