mirror of
https://github.com/triqs/dft_tools
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1906dc30a5
- add move semantics in expression template. for gfs : - rm descriptor - Remove data from expr, rewrote assignment which now iterates on the mesh, simply. RHS models now FunctionOnMesh - This fix the multiplication bug of gf - Remove assign_no_resize/assign_with_resize from proxy
134 lines
6.6 KiB
C++
134 lines
6.6 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 gfs {
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using utility::is_in_ZRC;
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using utility::remove_rvalue_ref;
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namespace gfs_expr_tools {
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// a wrapper for scalars
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template<typename S> struct scalar_wrap {
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typedef void variable_t;
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typedef void target_t;
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typedef void option_t;
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S s;
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template<typename T> scalar_wrap(T && x):s(std::forward<T>(x)){}
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S singularity() const { return s;}
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template<typename KeyType> S operator[](KeyType && key) const { return s;}
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template<typename ... Args> inline S 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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auto operator() (L && l, R && r) const -> decltype(std::forward<L>(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 std::forward<L>(l).mesh();
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}
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template<typename S, typename R> auto operator() (scalar_wrap<S> const &, R && r) const DECL_AND_RETURN(std::forward<R>(r).mesh());
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template<typename S, typename L> auto operator() (L && l, scalar_wrap<S> const &) const DECL_AND_RETURN(std::forward<L>(l).mesh());
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};
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template<typename T> struct node_t : std::conditional<utility::is_in_ZRC<T>::value, scalar_wrap<T>, typename remove_rvalue_ref<T>::type> {};
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template <typename A, typename B> struct _or_ {typedef void type;};
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template <typename A> struct _or_<A,A> {typedef A type;};
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template <typename A> struct _or_<void,A> {typedef A type;};
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template <typename A> struct _or_<A,void> {typedef A type;};
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template <> struct _or_<void,void> {typedef void type;};
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}// gfs_expr_tools
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template<typename Tag, typename L, typename R> struct gf_expr : TRIQS_CONCEPT_TAG_NAME(ImmutableGreenFunction){
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typedef typename std::remove_reference<L>::type L_t;
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typedef typename std::remove_reference<R>::type R_t;
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typedef typename gfs_expr_tools::_or_<typename L_t::variable_t,typename R_t::variable_t>::type variable_t;
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typedef typename gfs_expr_tools::_or_<typename L_t::target_t,typename R_t::target_t>::type target_t;
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typedef typename gfs_expr_tools::_or_<typename L_t::option_t,typename R_t::option_t>::type option_t;
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static_assert(!std::is_same<variable_t,void>::value, "Can not combine two gf expressions with different variables");
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static_assert(!std::is_same<target_t,void>::value, "Can not combine two gf expressions with different target");
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L l; R 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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auto mesh() const DECL_AND_RETURN(gfs_expr_tools::combine_mesh()(l,r));
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auto singularity() const DECL_AND_RETURN (utility::operation<Tag>()(l.singularity() , r.singularity()));
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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 L> struct gf_unary_m_expr : TRIQS_CONCEPT_TAG_NAME(ImmutableGreenFunction){
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typedef typename std::remove_reference<L>::type L_t;
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typedef typename L_t::variable_t variable_t;
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typedef typename L_t::target_t target_t;
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typedef typename L_t::option_t option_t;
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L l;
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template<typename LL> gf_unary_m_expr(LL && l_) : l(std::forward<LL>(l_)) {}
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auto mesh() const DECL_AND_RETURN(l.mesh());
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auto singularity() const DECL_AND_RETURN(l.singularity());
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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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// 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, \
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gf_expr<utility::tags::TAG, typename gfs_expr_tools::node_t<A1>::type, typename gfs_expr_tools::node_t<A2>::type>>::type\
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operator OP (A1 && a1, A2 && a2) { return {std::forward<A1>(a1),std::forward<A2>(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>
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typename std::enable_if<
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ImmutableGreenFunction<A1>::value,
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gf_unary_m_expr<typename gfs_expr_tools::node_t<A1>::type >
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>::type
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operator - (A1 && a1) { return {std::forward<A1>(a1)};}
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}}//namespace triqs::gf
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#endif
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