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dft_tools/triqs/arrays/h5/array_of_non_basic.hpp
2014-05-11 21:47:52 +02:00

112 lines
4.2 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2011-2013 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 <triqs/arrays/array.hpp>
#include <triqs/arrays/vector.hpp>
#include <triqs/h5.hpp>
#include "../cache.hpp"
namespace triqs {
namespace arrays {
// details for generic save/read of arrays.
namespace h5_impl {
inline std::string _h5_name() { return ""; }
template <typename T0, typename... Ts> std::string _h5_name(T0 const& t0, Ts const&... ts) {
auto r = std::to_string(t0);
auto r1 = _h5_name(ts...);
if (r1 != "") r += "_" + r1;
return r;
}
#ifndef __cpp_generic_lambdas
template <typename ArrayType> struct _save_lambda {
ArrayType const& a;
h5::group g;
template <typename... Is> void operator()(Is const&... is) const { h5_write(g, _h5_name(is...), a(is...)); }
};
template <typename ArrayType> struct _load_lambda {
ArrayType& a;
h5::group g;
template <typename... Is> void operator()(Is const&... is) { h5_read(g, _h5_name(is...), a(is...)); }
};
#endif
} // details
/*
* Write an array or a view into an hdf5 file when type is not fundamental
* ArrayType The type of the array/matrix/vector, etc..
* g The h5 group
* name The name of the hdf5 array in the file/group where the stack will be stored
* A The array to be stored
* The HDF5 exceptions will be caught and rethrown as TRIQS_RUNTIME_ERROR (with a full stackstrace, cf triqs doc).
*/
template <typename ArrayType>
std::c14::enable_if_t<is_amv_value_or_view_class<ArrayType>::value && !has_scalar_or_string_value_type<ArrayType>::value>
h5_write(h5::group gr, std::string name, ArrayType const& a) {
if (a.is_empty()) TRIQS_RUNTIME_ERROR << " Can not save an empty array into hdf5";
auto gr2 = gr.create_group(name);
gr2.write_triqs_hdf5_data_scheme(a);
// save the shape
array<int, 1> sha(ArrayType::rank);
for (int u = 0; u < ArrayType::rank; ++u) sha(u) = a.shape()[u];
h5_write(gr2, "shape", sha);
#ifndef __cpp_generic_lambdas
foreach(a, h5_impl::_save_lambda<ArrayType>{a, gr2});
#else
foreach(a, [&](auto... is) { h5_write(gr2, h5_impl::_h5_name(is...), a(is...)); });
#endif
}
/*
* Read an array or a view from an hdf5 file when type is not fundamental
* ArrayType The type of the array/matrix/vector, etc..
* g The h5 group
* name The name of the hdf5 array in the file/group where the stack will be stored
* A The array to be stored
* The HDF5 exceptions will be caught and rethrown as TRIQS_RUNTIME_ERROR (with a full stackstrace, cf triqs doc).
*/
template <typename ArrayType>
std::c14::enable_if_t<is_amv_value_or_view_class<ArrayType>::value && !has_scalar_or_string_value_type<ArrayType>::value>
h5_read(h5::group gr, std::string name, ArrayType& a) {
static_assert(!std::is_const<ArrayType>::value, "Can not read in const object");
auto gr2 = gr.open_group(name);
// TODO checking scheme...
// load the shape
auto sha2 = a.shape();
array<int, 1> sha;
h5_read(gr2, "shape", sha);
if (first_dim(sha) != sha2.size())
TRIQS_RUNTIME_ERROR << " array<array<...>> load : rank mismatch. Expected " << sha2.size()<< " Got " << first_dim(sha);
for (int u = 0; u < sha2.size(); ++u) sha2[u] = sha(u);
if (a.shape() != sha2) a.resize(sha2);
#ifndef __cpp_generic_lambdas
foreach(a, h5_impl::_load_lambda<ArrayType>{a, gr2});
#else
foreach(a, [&](auto... is) { h5_read(gr2, h5_impl::_h5_name(is...), a(is...)); });
#endif
}
}
}