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dft_tools/triqs/gfs/bz.hpp

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/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2012-2013 by O. Parcollet
*
* TRIQS is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#pragma once
#include "./tools.hpp"
#include "./gf.hpp"
#include "./local/tail.hpp"
#include "./domains/R.hpp"
#include "../lattice/bz_mesh.hpp"
#include "./evaluators.hpp"
namespace triqs {
namespace gfs {
struct bz {};
template <typename Opt> struct gf_mesh<bz, Opt> : lattice::bz_mesh {
template <typename... T> gf_mesh(T &&... x) : lattice::bz_mesh(std::forward<T>(x)...) {}
};
namespace gfs_implementation {
// h5 name
template <typename Opt> struct h5_name<bz, matrix_valued, Opt> {
static std::string invoke() { return "BZ"; }
};
/// --------------------------- data access ---------------------------------
template <typename Opt> struct data_proxy<bz, matrix_valued, Opt> : data_proxy_array<std::complex<double>, 3> {};
template <typename Opt> struct data_proxy<bz, scalar_valued, Opt> : data_proxy_array<std::complex<double>, 1> {};
/// --------------------------- evaluator ---------------------------------
// simple evaluation : take the point on the grid...
template <> struct evaluator_fnt_on_mesh<bz> {
size_t n;
evaluator_fnt_on_mesh() = default;
template <typename MeshType> evaluator_fnt_on_mesh(MeshType const &m, lattice::k_t const &k) {
n = m.locate_neighbours(k); // TO BE IMPROVED
}
template <typename F> auto operator()(F const &f) const DECL_AND_RETURN(f(n));
//template <typename F> decltype(auto) operator()(F const &f) const { return f(n); }
};
// ------------- evaluator -------------------
// handle the case where the matsu. freq is out of grid...
template <typename Target, typename Opt> struct evaluator<bz, Target, Opt> {
static constexpr int arity = 1;
template <typename G>
std::c14::conditional_t<std::is_same<Target, matrix_valued>::value, arrays::matrix_const_view<std::complex<double>>,
std::complex<double>>
operator()(G const *g, lattice::k_t const &k) const {
auto n = g->mesh().locate_neighbours(k); // TO BE IMPROVED
return (*g)[n];
}
};
}
}
}