mirror of
https://github.com/triqs/dft_tools
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130 lines
7.6 KiB
C++
130 lines
7.6 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) 2012 by M. Ferrero, 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_GF_EXPR_H
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#define TRIQS_GF_EXPR_H
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#include <triqs/utility/expression_template_tools.hpp>
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namespace triqs { namespace gf {
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using utility::is_in_ZRC;
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namespace gf_expr_tools {
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template<typename S> struct scalar_wrap {
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typedef S value_type;
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S s; scalar_wrap(S const &s_):s(s_){}
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S singularity() const { return s;}
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S data() const { return s;}
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template<typename KeyType> value_type operator[](KeyType && key) const { return s;}
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template<typename ... Args> inline value_type operator()(Args && ... args) const { return s;}
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friend std::ostream &operator <<(std::ostream &sout, scalar_wrap const &expr){return sout << expr.s; }
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};
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// Combine the two meshes of LHS and RHS : need to specialize where there is a scalar
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struct combine_mesh {
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template<typename L, typename R>
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inline auto operator() (L const & l, R const & r) const -> decltype(l.mesh()) {
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if (!(l.mesh() == r.mesh())) TRIQS_RUNTIME_ERROR << "Mesh mismatch : ";//<< l.mesh()<<" vs" <<r.mesh();
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return l.mesh();
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}
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template<typename S, typename R> auto operator() (scalar_wrap<S> const & w, R const & r) const -> decltype(r.mesh()) { return r.mesh();}
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template<typename S, typename L> auto operator() (L const & l, scalar_wrap<S> const & w) const -> decltype(l.mesh()) { return l.mesh();}
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};
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template<typename T> struct keeper_type : std::conditional<utility::is_in_ZRC<T>::value, scalar_wrap<T>, typename view_type_if_exists_else_type<T>::type> {};
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}// gf_expr_tools
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template<typename Descriptor, typename Tag, typename L, typename R> struct gf_expr : TRIQS_MODEL_CONCEPT(ImmutableGreenFunction),gf_tag<Descriptor> {
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typedef typename gf_expr_tools::keeper_type<L>::type L_t;
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typedef typename gf_expr_tools::keeper_type<R>::type R_t;
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typedef Descriptor descriptor_t;
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//typedef typename std::result_of<utility::operation<Tag>(typename L_t::value_type,typename R_t::value_type)>::type value_t;
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typedef typename std::remove_reference<typename std::result_of<gf_expr_tools::combine_mesh(L_t,R_t)>::type>::type mesh_t;
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//typedef typename Descriptor::singularity_t::view_type singularity_view_t;
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//typedef value_t value_type;
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L_t l; R_t r;
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template<typename LL, typename RR> gf_expr(LL && l_, RR && r_) : l(std::forward<LL>(l_)), r(std::forward<RR>(r_)) {}
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mesh_t mesh() const { return gf_expr_tools::combine_mesh()(l,r); }
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auto data() const ->decltype( utility::operation<Tag>()(l.data(), r.data())) { return utility::operation<Tag>()(l.data(), r.data());}
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auto singularity() const DECL_AND_RETURN (utility::operation<Tag>()(l.singularity() , r.singularity()));
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//const singularity_view_t singularity() const { return utility::operation<Tag>()(l.singularity() , r.singularity());}
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//symmetry_t const & symmetry() const { return _symmetry;}
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template<typename KeyType> auto operator[](KeyType && key) const DECL_AND_RETURN(utility::operation<Tag>()(l[std::forward<KeyType>(key)] , r[std::forward<KeyType>(key)]));
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template<typename ... Args> auto operator()(Args && ... args) const DECL_AND_RETURN(utility::operation<Tag>()(l(std::forward<Args>(args)...) , r(std::forward<Args>(args)...)));
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friend std::ostream &operator <<(std::ostream &sout, gf_expr const &expr){return sout << "("<<expr.l << " "<<utility::operation<Tag>::name << " "<<expr.r<<")" ; }
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};
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// -------------------------------------------------------------------
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//a special case : the unary operator !
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template<typename Descriptor, typename L> struct gf_unary_m_expr : TRIQS_MODEL_CONCEPT(ImmutableGreenFunction),gf_tag<Descriptor>{
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typedef typename gf_expr_tools::keeper_type<L>::type L_t;
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typedef Descriptor descriptor_t;
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//typedef typename L_t::value_type value_type;
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typedef typename L_t::mesh_t mesh_t;
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//typedef typename Descriptor::singularity_t::view_type singularity_view_t;
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L_t l;
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template<typename LL> gf_unary_m_expr(LL && l_) : l(std::forward<LL>(l_)) {}
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mesh_t mesh() const { return l.mesh(); }
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auto data() const ->decltype( - l.data()) { return - l.data();}
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auto singularity() const DECL_AND_RETURN(l.singularity());
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//const singularity_view_t singularity() const { return l.singularity();}
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//symmetry_t const & symmetry() const { return _symmetry;}
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template<typename KeyType> auto operator[](KeyType&& key) const DECL_AND_RETURN( -l[key]);
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template<typename ... Args> auto operator()(Args && ... args) const DECL_AND_RETURN( -l(std::forward<Args>(args)...));
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friend std::ostream &operator <<(std::ostream &sout, gf_unary_m_expr const &expr){return sout << '-'<<expr.l; }
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};
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// -------------------------------------------------------------------
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// get the descriptor ...
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template<typename A1, typename A2, typename Enable=void> struct get_desc;
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template<typename A1, typename A2>
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struct get_desc <A1,A2, typename std::enable_if<((!ImmutableGreenFunction<A1>::value) && (ImmutableGreenFunction<A2>::value))>::type > {
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typedef typename A2::descriptor_t type;
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};
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template<typename A1, typename A2>
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struct get_desc <A1,A2,typename std::enable_if<(!ImmutableGreenFunction<A2>::value) && (ImmutableGreenFunction<A1>::value)>::type > {
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typedef typename A1::descriptor_t type;
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};
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template<typename A1, typename A2>
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struct get_desc <A1,A2, typename std::enable_if< (ImmutableGreenFunction<A1>::value) && (ImmutableGreenFunction<A2>::value) && std::is_same<typename A1::descriptor_t,typename A2::descriptor_t>::value >::type > { typedef typename A2::descriptor_t type; };
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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, gf_expr<typename get_desc<A1,A2>::type, utility::tags::TAG, A1,A2>>::type\
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operator OP (A1 const & a1, A2 const & a2) { return gf_expr<typename get_desc<A1,A2>::type,utility::tags::TAG, A1,A2>(a1,a2);}
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DEFINE_OPERATOR(plus, +, ImmutableGreenFunction,ImmutableGreenFunction);
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DEFINE_OPERATOR(minus, -, ImmutableGreenFunction,ImmutableGreenFunction);
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DEFINE_OPERATOR(multiplies, *, ImmutableGreenFunction,ImmutableGreenFunction);
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DEFINE_OPERATOR(multiplies, *, is_in_ZRC,ImmutableGreenFunction);
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DEFINE_OPERATOR(multiplies, *, ImmutableGreenFunction,is_in_ZRC);
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DEFINE_OPERATOR(divides, /, ImmutableGreenFunction,ImmutableGreenFunction);
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DEFINE_OPERATOR(divides, /, is_in_ZRC,ImmutableGreenFunction);
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DEFINE_OPERATOR(divides, /, ImmutableGreenFunction,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<ImmutableGreenFunction<A1>::value, gf_unary_m_expr<typename A1::descriptor_t, A1>>::type
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operator - (A1 const & a1) { return gf_unary_m_expr<typename A1::descriptor_t, A1>(a1);}
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}}//namespace triqs::gf
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#endif
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