mirror of
https://github.com/triqs/dft_tools
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70 lines
4.3 KiB
C++
70 lines
4.3 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) 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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#pragma once
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namespace triqs {
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namespace utility {
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// Derive from this object using CRTP to provide arithmetic operation by casting the final object to C
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// by not forwarding x, I assume the cast is a simple value, not a matrix, but this is ok
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template <typename Derived, typename C> struct arithmetic_ops_by_cast {};
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#define IMPL_OP(OP) \
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template <typename D, typename C, typename Y> \
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auto operator OP(arithmetic_ops_by_cast<D, C> const &x, Y &&y)->decltype(std::declval<C>() OP std::forward<Y>(y)) { \
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return C(static_cast<D const &>(x)) OP std::forward<Y>(y); \
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} \
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template <typename D, typename C, typename Y> \
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auto operator OP(Y &&y, arithmetic_ops_by_cast<D, C> const &x) \
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->TYPE_DISABLE_IF(decltype(std::forward<Y>(y) OP std::declval<C>()), \
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std::is_base_of<D, typename std::remove_cv<typename std::remove_reference<Y>::type>::type>) { \
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return std::forward<Y>(y) OP C(static_cast<D const &>(x)); \
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}
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IMPL_OP(+);
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IMPL_OP(-);
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IMPL_OP(*);
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IMPL_OP(/ );
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#undef IMPL_OP
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// Same thing, but disallow the operations with the type itself
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template <typename Derived, typename C> struct arithmetic_ops_by_cast_disable_same_type {};
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#define IMPL_OP(OP) \
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template <typename D, typename C, typename Y> \
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auto operator OP(arithmetic_ops_by_cast_disable_same_type<D, C> const &x, Y &&y) \
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->TYPE_DISABLE_IF(decltype(std::declval<C>() OP std::forward<Y>(y)), \
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std::is_base_of<D, typename std::remove_cv<typename std::remove_reference<Y>::type>::type>) { \
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return C(static_cast<D const &>(x)) OP std::forward<Y>(y); \
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} \
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template <typename D, typename C, typename Y> \
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auto operator OP(Y &&y, arithmetic_ops_by_cast_disable_same_type<D, C> const &x) \
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->TYPE_DISABLE_IF(decltype(std::forward<Y>(y) OP std::declval<C>()), \
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std::is_base_of<D, typename std::remove_cv<typename std::remove_reference<Y>::type>::type>) { \
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return std::forward<Y>(y) OP C(static_cast<D const &>(x)); \
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}
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IMPL_OP(+);
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IMPL_OP(-);
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IMPL_OP(*);
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IMPL_OP(/ );
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#undef IMPL_OP
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}
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}
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