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Fri, Jun 21, 15:59
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rTAMAAS tamaas
cast.hh
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/**
* @file
*
* @author Lucas Frérot <lucas.frerot@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2017 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Tamaas 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __CAST_HH__
#define __CAST_HH__
/* -------------------------------------------------------------------------- */
#include "grid_base.hh"
#include "surface.hh"
#include "numpy.hh"
/* -------------------------------------------------------------------------- */
#include <pybind11/cast.h>
#include <boost/preprocessor/seq.hpp>
/* -------------------------------------------------------------------------- */
namespace
pybind11
{
namespace
detail
{
/**
* Type caster for grid classes
* inspired by https://tinyurl.com/y8m47qh3 from T. De Geus
* and pybind11/eigen.h
*/
template
<
template
<
typename
,
unsigned
int
>
class
G
,
typename
T
,
unsigned
int
dim
>
struct
type_caster
<
G
<
T
,
dim
>>
{
using
type
=
G
<
T
,
dim
>
;
template
<
typename
U
>
using
array_type
=
array_t
<
U
,
array
::
c_style
|
array
::
forcecast
>
;
public
:
PYBIND11_TYPE_CASTER
(
type
,
_
(
"GridWrap<T, dim>"
));
/**
* Conversion part 1 (Python->C++): convert a PyObject into a grid
* instance or return false upon failure. The second argument
* indicates whether implicit conversions should be applied.
*/
bool
load
(
handle
src
,
bool
convert
)
{
if
(
!
convert
&&
!
array_type
<
typename
type
::
value_type
>::
check_
(
src
))
return
false
;
auto
buf
=
array_type
<
typename
type
::
value_type
>::
ensure
(
src
);
value
.
move
(
tamaas
::
wrap
::
GridNumpy
<
G
<
T
,
dim
>>
(
buf
));
return
true
;
}
/**
* Conversion part 2 (C++ -> Python): convert a grid instance into
* a Python object. The second and third arguments are used to
* indicate the return value policy and parent object (for
* ``return_value_policy::reference_internal``) and are generally
* ignored by implicit casters.
*
* TODO: do not ignore policy (see pybind11/eigen.h)
*/
static
handle
cast
(
const
type
&
src
,
return_value_policy
/* policy */
,
handle
/*parent*/
)
{
if
(
src
.
getNbComponents
()
==
1
)
{
// none() passed as parent to get a correct nocopy
auto
a
=
array_type
<
T
>
(
src
.
sizes
(),
src
.
getInternalData
(),
none
());
return
a
.
release
();
}
else
{
std
::
array
<
unsigned
int
,
dim
+
1
>
sizes
;
std
::
copy_n
(
src
.
sizes
().
begin
(),
dim
,
sizes
.
begin
());
sizes
.
back
()
=
src
.
getNbComponents
();
// none() passed as parent to get a correct nocopy
auto
a
=
array_type
<
T
>
(
sizes
,
src
.
getInternalData
(),
none
());
return
a
.
release
();
}
}
};
/**
* Type caster for GridBase classes
*/
template
<
typename
T
>
struct
type_caster
<
tamaas
::
GridBase
<
T
>>
{
using
type
=
tamaas
::
GridBase
<
T
>
;
template
<
typename
U
>
using
array_type
=
array_t
<
U
,
array
::
c_style
|
array
::
forcecast
>
;
public
:
PYBIND11_TYPE_CASTER
(
type
,
_
(
"GridBaseWrap<T>"
));
bool
load
(
handle
src
,
bool
convert
)
{
if
(
!
convert
&&
!
array_type
<
T
>::
check_
(
src
))
return
false
;
auto
buf
=
array_type
<
T
>::
ensure
(
src
);
value
.
move
(
tamaas
::
wrap
::
GridBaseNumpy
<
T
>
(
buf
));
return
true
;
}
static
handle
cast
(
const
type
&
src
,
return_value_policy
/* policy */
,
handle
/*parent*/
)
{
#define GRID_BASE_CASE(unused1, unused2, dim) \
case dim: { \
const tamaas::Grid<T, dim>& conv = static_cast<decltype(conv)>(src); \
if (src.getNbComponents() != 1) { \
std::array<unsigned int, dim + 1> sizes; \
std::copy_n(conv.sizes().begin(), dim, sizes.begin()); \
sizes.back() = src.getNbComponents(); \
return array_type<T>(sizes, src.getInternalData(), none()).release(); \
} else { \
return array_type<T>(conv.sizes(), src.getInternalData(), none()) \
.release(); \
} \
}
switch
(
src
.
getDimension
())
{
BOOST_PP_SEQ_FOR_EACH
(
GRID_BASE_CASE
,
~
,
(
1
)(
2
)(
3
));
default
:
return
nullptr
;
}
#undef GRID_BASE_CASE
}
};
/**
* Type caster for surface class
*/
template
<
typename
T
>
struct
type_caster
<
tamaas
::
Surface
<
T
>>
{
using
type
=
tamaas
::
Surface
<
T
>
;
template
<
typename
U
>
using
array_type
=
array_t
<
U
,
array
::
c_style
|
array
::
forcecast
>
;
public
:
PYBIND11_TYPE_CASTER
(
type
,
_
(
"SurfaceWrap<T, dim>"
));
bool
load
(
handle
src
,
bool
convert
)
{
if
(
!
convert
&&
!
array_type
<
T
>::
check_
(
src
))
return
false
;
auto
buf
=
array_type
<
T
>::
ensure
(
src
);
value
.
move
(
tamaas
::
wrap
::
SurfaceNumpy
<
type
>
(
buf
));
return
true
;
}
static
handle
cast
(
const
type
&
src
,
return_value_policy
/* policy */
,
handle
/*parent*/
)
{
auto
a
=
array_type
<
T
>
(
src
.
sizes
(),
src
.
getInternalData
(),
none
());
return
a
.
release
();
}
};
}
// namespace detail
}
// namespace pybind11
#endif
// __CAST_HH__
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