mirror of
https://github.com/triqs/dft_tools
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86 lines
4.3 KiB
C++
86 lines
4.3 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_ARRAYS_EXPRESSION_ARRAY_ALGEBRA_H
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#define TRIQS_ARRAYS_EXPRESSION_ARRAY_ALGEBRA_H
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#include "./tools.hpp"
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namespace triqs { namespace arrays {
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template<typename Tag, typename L, typename R>
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struct array_expr : TRIQS_CONCEPT_TAG_NAME(ImmutableArray) {
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typedef typename keeper_type<L>::type L_t;
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typedef typename keeper_type<R>::type R_t;
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static_assert( get_rank<R_t>::value==0 || get_rank<L_t>::value==0 || get_rank<L_t>::value == get_rank<R_t>::value, "rank mismatch in array operations");
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typedef typename std::result_of<operation<Tag>(typename L_t::value_type,typename R_t::value_type)>::type value_type;
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typedef typename std::remove_reference<typename std::result_of<combine_domain(L_t,R_t)>::type>::type domain_type;
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L_t l; R_t r;
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template<typename LL, typename RR> array_expr(LL && l_, RR && r_) : l(std::forward<LL>(l_)), r(std::forward<RR>(r_)) {}
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domain_type domain() const { return combine_domain()(l,r); }
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//template<typename KeyType> value_type operator[](KeyType && key) const { return operation<Tag>()(l[std::forward<KeyType>(key)] , r[std::forward<KeyType>(key)]);}
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template<typename ... Args> value_type operator()(Args && ... args) const { return operation<Tag>()(l(std::forward<Args>(args)...) , r(std::forward<Args>(args)...));}
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friend std::ostream &operator <<(std::ostream &sout, array_expr const &expr){return sout << "("<<expr.l << " "<<operation<Tag>::name << " "<<expr.r<<")" ; }
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};
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// a special case : the unary operator !
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template<typename L> struct array_unary_m_expr : TRIQS_CONCEPT_TAG_NAME(ImmutableArray) {
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typedef typename keeper_type<L>::type L_t;
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typedef typename L_t::value_type value_type;
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typedef typename L_t::domain_type domain_type;
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L_t l;
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template<typename LL> array_unary_m_expr(LL && l_) : l(std::forward<LL>(l_)) {}
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domain_type domain() const { return l.domain(); }
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//template<typename KeyType> value_type operator[](KeyType&& key) const {return -l[key];}
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template<typename ... Args> value_type operator()(Args && ... args) const { return -l(std::forward<Args>(args)...);}
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friend std::ostream &operator <<(std::ostream &sout, array_unary_m_expr const &expr){return sout << '-'<<expr.l; }
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};
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// Now we can define all the C++ operators ...
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#define DEFINE_OPERATOR(TAG, OP, TRAIT1, TRAIT2) \
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template<typename A1, typename A2>\
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typename std::enable_if<TRAIT1<A1>::value && TRAIT2 <A2>::value, array_expr<tags::TAG, A1,A2>>::type\
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operator OP (A1 const & a1, A2 const & a2) { return array_expr<tags::TAG, A1,A2>(a1,a2);}
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DEFINE_OPERATOR(plus, +, ImmutableArray,ImmutableArray);
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DEFINE_OPERATOR(minus, -, ImmutableArray,ImmutableArray);
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DEFINE_OPERATOR(multiplies, *, ImmutableArray,ImmutableArray);
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DEFINE_OPERATOR(multiplies, *, is_in_ZRC,ImmutableArray);
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DEFINE_OPERATOR(multiplies, *, ImmutableArray,is_in_ZRC);
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DEFINE_OPERATOR(divides, /, ImmutableArray,ImmutableArray);
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DEFINE_OPERATOR(divides, /, is_in_ZRC,ImmutableArray);
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DEFINE_OPERATOR(divides, /, ImmutableArray,is_in_ZRC);
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#undef DEFINE_OPERATOR
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// the unary is special
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template<typename A1> typename std::enable_if<ImmutableArray<A1>::value, array_unary_m_expr<A1>>::type
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operator - (A1 const & a1) { return {a1};}
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template<typename Expr > array<typename Expr::value_type, Expr::domain_type::rank>
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make_array( Expr const & e) { return array<typename Expr::value_type, Expr::domain_type::rank>(e);}
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}}//namespace triqs::arrays
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#endif
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