mirror of
https://github.com/triqs/dft_tools
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75 lines
2.7 KiB
C++
75 lines
2.7 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) 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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#ifndef TRIQS_GF_EVALUATOR_H
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#define TRIQS_GF_EVALUATOR_H
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#include "./tools.hpp"
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#include "./gf.hpp"
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namespace triqs { namespace gfs {
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namespace gfs_implementation {
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// simple evaluation : take the point on the grid...
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struct evaluator_grid_simple {
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long n;
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evaluator_grid_simple() = default;
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template<typename MeshType, typename PointType>
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evaluator_grid_simple (MeshType const & m, PointType const & p) { n=p; }
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template<typename F> auto operator()(F const & f) const DECL_AND_RETURN(f (n));
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};
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// a linear interpolation
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struct evaluator_grid_linear_interpolation {
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double w1, w2; size_t n1, n2;
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evaluator_grid_linear_interpolation() = default;
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template<typename MeshType, typename PointType>
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evaluator_grid_linear_interpolation (MeshType const & m, PointType const & p, double prefactor=1) {
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bool in; double w;
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std::tie(in, n1, w) = windowing(m,p);
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if (!in) TRIQS_RUNTIME_ERROR <<" Evaluation out of bounds";
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w1 = prefactor * (1-w); w2 = prefactor * w; n2 = n1 +1;
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}
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template<typename F> auto operator()(F const & f) const DECL_AND_RETURN(w1 * f(n1) + w2 * f (n2));
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};
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// the evaluator for various types.
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template<typename MeshType> struct evaluator_fnt_on_mesh;
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// can not use inherited constructors, too recent...
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#define TRIQS_INHERIT_AND_FORWARD_CONSTRUCTOR(NEWCLASS,CLASS) : CLASS { template<typename ...T> NEWCLASS(T &&... t) : CLASS(std::forward<T>(t)...){};};
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//
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template<typename Variable>
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struct evaluator_one_var {
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public :
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static constexpr int arity = 1;
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evaluator_one_var() = default;
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template<typename G> auto operator()(G const * g, double x) const DECL_AND_RETURN(evaluator_fnt_on_mesh<Variable> (g->mesh(),x)(on_mesh(*g)));
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template<typename G> typename G::singularity_t const & operator()(G const * g,freq_infty const &) const {return g->singularity();}
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};
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}
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}}
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#endif
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