mirror of
https://github.com/triqs/dft_tools
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60 lines
2.5 KiB
C++
60 lines
2.5 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_UTILITY_EXPRESSION_TEMPLATE_TOOLS_H
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#define TRIQS_UTILITY_EXPRESSION_TEMPLATE_TOOLS_H
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#include <type_traits>
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#include <complex>
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namespace triqs { namespace utility {
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namespace tags { struct plus{}; struct minus{}; struct multiplies{}; struct divides{}; }
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// The basic operations put in a template....
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template<typename Tag> struct operation;
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template<> struct operation<tags::plus> {
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template<typename L, typename R> auto operator()(L const & l, R const & r) const -> decltype(l+r) { return l+r;}
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static const char name = '+';
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};
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template<> struct operation<tags::minus> {
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template<typename L, typename R> auto operator()(L const & l, R const & r) const -> decltype(l-r) { return l-r;}
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static const char name = '-';
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};
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template<> struct operation<tags::multiplies> {
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template<typename L, typename R> auto operator()(L const & l, R const & r) const -> decltype(l*r) { return l*r;}
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static const char name = '*';
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};
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template<> struct operation<tags::divides> {
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template<typename L, typename R> auto operator()(L const & l, R const & r) const -> decltype(l/r) { return l/r;}
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static const char name = '/';
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};
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// The scalar ...
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template<typename T> struct is_in_ZRC : std::is_arithmetic<T> {};
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template<> struct is_in_ZRC<bool> : std::true_type {};
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template<typename T> struct is_in_ZRC<std::complex<T> > : std::true_type {};
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template<typename A, typename B>
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struct type_of_mult{
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typedef decltype ( std::declval<typename std::remove_reference<A>::type>() * std::declval<typename std::remove_reference<B>::type>() ) type;
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};
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}}//namespace triqs::utility
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#endif
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