mirror of
https://github.com/triqs/dft_tools
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95 lines
2.5 KiB
C++
95 lines
2.5 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 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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#pragma once
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#include "./brillouin_zone.hpp"
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namespace triqs {
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namespace lattice {
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/**
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* Generate the point in a cuboid as an array<double,1> const &
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*/
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class grid_generator : public boost::iterator_facade<grid_generator, k_t const &, boost::forward_traversal_tag, k_t const &> {
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friend class boost::iterator_core_access;
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int dim, nkpts, nx, ny, nz, N_X, N_Y, N_Z, index_;
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double step_x, step_y, step_z;
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bool at_end;
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k_t pt;
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void init() {
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nx = 0;
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ny = 0;
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nz = 0;
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at_end = false;
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index_ = 0;
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N_X = nkpts;
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N_Y = (dim > 1 ? nkpts : 1);
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N_Z = (dim > 2 ? nkpts : 1);
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step_x = 1.0 / double(N_X);
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step_y = 1.0 / double(N_Y);
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step_z = 1.0 / double(N_Z);
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pt(0) = step_x / 2;
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pt(1) = step_y / 2;
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pt(2) = step_z / 2;
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}
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void increment() {
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if (nx < N_X - 1) {
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++nx;
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pt(0) += step_x;
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++index_;
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return;
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}
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pt(0) = step_x / 2;
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nx = 0;
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if (ny < N_Y - 1) {
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++ny;
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pt(1) += step_y;
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++index_;
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return;
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}
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pt(1) = step_y / 2;
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ny = 0;
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if (nz < N_Z - 1) {
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++nz;
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pt(2) += step_z;
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++index_;
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return;
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}
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at_end = true;
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}
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value_type dereference() const { return pt; }
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bool equal(grid_generator const &other) const {
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return ((other.dim == dim) && (other.index_ == index_) && (other.nkpts == nkpts));
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}
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public:
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/// dim : dimension, nkpts : number of k point in each dimension
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grid_generator(int dim_, int nkpts_) : dim(dim_), nkpts(nkpts_), pt(3) { init(); }
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grid_generator() : dim(3), nkpts(0), pt(3) { init(); }
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int size() const { return (N_X * N_Y * N_Z); }
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int index() const { return index_; }
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operator bool() const { return !(at_end); }
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};
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}
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}
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