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dft_tools/triqs/gfs/local/no_tail.hpp
2014-05-11 21:47:51 +02:00

64 lines
2.6 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2013-2014 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 "./tail.hpp"
namespace triqs {
namespace gfs {
struct no_tail {};
template <typename Variable, typename Target, bool V, bool C>
gf_view<Variable, Target, no_tail, C> make_gf_view_without_tail(gf_impl<Variable, Target, void, V, C> const &g) {
return {g.mesh(), g.data(), {}, g.symmetry(), g.indices(), g.name};
}
namespace details { // dispatch the test for scalar_valued and matrix_valued
using arrays::mini_vector;
inline void _equal_or_throw(mini_vector<size_t, 2> const &s_t, mini_vector<size_t, 2> const &g_t) {
if (s_t != g_t) TRIQS_RUNTIME_ERROR << "make_gf_from_g_and_tail: Shape of the gf target and of the tail mismatch";
}
inline void _equal_or_throw(mini_vector<size_t, 2> const &s_t, mini_vector<size_t, 0> const &g_t) {
if (s_t != mini_vector<size_t, 2>{1, 1})
TRIQS_RUNTIME_ERROR << "make_gf_from_g_and_tail: tail shape must be 1x1 for a scalar gf";
}
}
template <typename Variable, typename Target, bool V, bool C>
gf_view<Variable, Target> make_gf_from_g_and_tail(gf_impl<Variable, Target, no_tail, V, C> const &g, local::tail t) {
details::_equal_or_throw(t.shape(), get_target_shape(g));
auto g2 = gf<Variable, Target, no_tail>{g}; // copy the function without tail
return {std::move(g2.mesh()), std::move(g2.data()), std::move(t), g2.symmetry()};
}
template <typename Variable, typename Target, bool V, bool C>
gf_view<Variable, Target, void, C> make_gf_view_from_g_and_tail(gf_impl<Variable, Target, no_tail, V, C> const &g,
local::tail_view t) {
details::_equal_or_throw(t.shape(), get_target_shape(g));
return {g.mesh(), g.data(), t, g.symmetry()};
}
}
}