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// -*- tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_PYTHON_COMMON_FVECTOR_HH
#define DUNE_PYTHON_COMMON_FVECTOR_HH
#include <cstddef>
#include <algorithm>
#include <stdexcept>
#include <string>
#include <tuple>
#include <utility>
#include <dune/common/fvector.hh>
#include <dune/common/classname.hh>
#include <dune/python/common/typeregistry.hh>
#include <dune/python/common/densevector.hh>
#include <dune/python/common/string.hh>
#include <dune/python/pybind11/pybind11.h>
#include <dune/python/pybind11/operators.h>
namespace Dune
{
namespace Python
{
// to_string
// ---------
template< class K, int size >
inline static std::string to_string ( const FieldVector< K, size > &x )
{
return "(" + join( ", ", [] ( auto &&x ) { return to_string( x ); }, x.begin(), x.end() ) + ")";
}
// registerFieldVector
// -------------------
template< class K, int size, class ...options >
void registerFieldVector ( pybind11::handle scope, pybind11::class_<Dune::FieldVector<K,size>, options...> cls )
{
using pybind11::operator""_a;
typedef Dune::FieldVector<K, size> FV;
cls.def( pybind11::init( [] () { return new FV(); } ) );
if( size == 1 )
{
cls.def( pybind11::init( [] ( int a ) { return new FV( K( a ) ); } ) );
cls.def( pybind11::init( [] ( K a ) { return new FV( a ); } ) );
cls.def( "__float__", [] ( const FV &self ) { return self[ 0 ]; } );
pybind11::implicitly_convertible< int, FV >();
pybind11::implicitly_convertible< K, FV >();
}
cls.def( pybind11::init( [] ( pybind11::buffer x ) {
pybind11::buffer_info info = x.request();
if( info.format != pybind11::format_descriptor< K >::format() )
throw pybind11::value_error( "Incompatible buffer format." );
if( info.ndim != 1 )
throw pybind11::value_error( "Only one-dimensional buffers can be converted into FieldVector." );
const ssize_t stride = info.strides[ 0 ] / sizeof( K );
const ssize_t sz = std::min( static_cast< ssize_t >( size ), info.shape[ 0 ] );
FV *self = new FV( K( 0 ) );
for( ssize_t i = 0; i < sz; ++i )
(*self)[ i ] = static_cast< K * >( info.ptr )[ i*stride ];
return self;
} ), "x"_a );
cls.def( pybind11::init( [] ( pybind11::tuple x ) {
FV *self = new FV( K( 0 ) );
const std::size_t sz = std::min( static_cast< std::size_t >( size ), x.size() );
// should this fail in case the sizes do not match?
for( std::size_t i = 0; i < sz; ++i )
(*self)[ i ] = x[ i ].template cast< K >();
return self;
} ), "x"_a );
cls.def( pybind11::init( [] ( pybind11::list x ) {
FV *self = new FV( K( 0 ) );
const std::size_t sz = std::min( static_cast< std::size_t >( size ), x.size() );
// should this fail in case the sizes do not match?
for( std::size_t i = 0; i < sz; ++i )
(*self)[ i ] = x[ i ].template cast< K >();
return self;
} ), "x"_a );
cls.def( pybind11::init( [] ( pybind11::args args ) {
FV *self = new FV( K( 0 ) );
const std::size_t sz = std::min( static_cast< std::size_t >( size ), args.size() );
// should this fail in case the sizes do not match?
for( std::size_t i = 0; i < sz; ++i )
(*self)[ i ] = args[ i ].template cast< K >();
return self;
} ) );
pybind11::implicitly_convertible< pybind11::args, FV >();
pybind11::implicitly_convertible< pybind11::buffer, FV >();
cls.def("copy", [](FV& , pybind11::args l) {
FV v(K(0));
const std::size_t sz = std::min(v.size(), l.size());
// should this fail in case the sizes do not match?
for (std::size_t i = 0; i < sz; ++i)
v[i] = l[i].template cast<K>();
return v;
});
cls.def( "__str__", [] ( const FV &self ) { return to_string( self ); } );
cls.def( "__repr__", [] ( const FV &self ) {
return "Dune::FieldVector<"+to_string(size)+">"+to_string(self);
} );
cls.def_buffer( [] ( FV &self ) -> pybind11::buffer_info {
return pybind11::buffer_info(
&self[ 0 ], /* Pointer to buffer */
sizeof( K ), /* Size of one scalar */
pybind11::format_descriptor< K >::format(), /* Python struct-style format descriptor */
1, /* Number of dimensions */
{ size }, /* Buffer dimensions */
/* Strides (in bytes) for each index */
{
static_cast< std::size_t >( reinterpret_cast< char * >( &self[ 1 ] ) - reinterpret_cast< char * >( &self[ 0 ] ) ) } );
}
);
registerDenseVector< FV >( cls );
}
template< class K, int size >
void registerFieldVector ( pybind11::handle scope, std::integral_constant< int, size > = {} )
{
typedef Dune::FieldVector<K, size> FV;
std::string fname = className<K>();
auto entry = insertClass<FV>(scope, "FieldVector_"+fname+"_"+std::to_string(size), pybind11::buffer_protocol(),
GenerateTypeName("Dune::FieldVector",MetaType<K>(),size),IncludeFiles{"dune/common/fvector.hh"}
);
if (!entry.second)
return;
registerFieldVector(scope, entry.first);
}
template<class K, int... size>
void registerFieldVector(pybind11::handle scope, std::integer_sequence<int, size...>)
{
std::ignore = std::make_tuple((registerFieldVector<K>(scope, std::integral_constant<int, size>()), size)...);
}
} // namespace Python
} // namespace Dune
#endif // #ifndef DUNE_PYTHON_COMMON_FVECTOR_HH
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