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rTAMAAS tamaas
apply.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 __APPLY_HH__
#define __APPLY_HH__
/* -------------------------------------------------------------------------- */
#include "tamaas.hh"
#include <cstddef>
#include <thrust/tuple.h>
#include <utility>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
namespace
detail
{
/// Helper function for application of a functor on a thrust::tuple
template
<
size_t
nargs
>
struct
Apply
;
template
<>
struct
Apply
<
0
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
[[
gnu
::
unused
]])
->
decltype
(
func
())
{
return
func
();
}
};
template
<>
struct
Apply
<
1
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
)
->
decltype
(
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
))))
{
return
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)));
}
};
template
<>
struct
Apply
<
2
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
)
->
decltype
(
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
))))
{
return
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)));
}
};
template
<>
struct
Apply
<
3
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
)
->
decltype
(
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
))))
{
return
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
)));
}
};
template
<>
struct
Apply
<
4
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
)
->
decltype
(
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
3
>
(
std
::
forward
<
Tuple
>
(
t
))))
{
return
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
3
>
(
std
::
forward
<
Tuple
>
(
t
)));
}
};
template
<>
struct
Apply
<
5
>
{
template
<
typename
Functor
,
typename
Tuple
>
__host__
__device__
static
auto
apply
(
Functor
&&
func
,
Tuple
&&
t
)
->
decltype
(
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
3
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
4
>
(
std
::
forward
<
Tuple
>
(
t
))))
{
return
func
(
thrust
::
get
<
0
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
1
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
2
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
3
>
(
std
::
forward
<
Tuple
>
(
t
)),
thrust
::
get
<
4
>
(
std
::
forward
<
Tuple
>
(
t
)));
}
};
/// Helper class for functor application in thrust
template
<
typename
Functor
,
typename
ret_type
=
void
>
class
ApplyFunctor
{
public
:
__host__
__device__
ApplyFunctor
(
const
Functor
&
functor
)
:
functor
(
functor
)
{}
__host__
__device__
ApplyFunctor
(
const
ApplyFunctor
&
o
)
:
functor
(
o
.
functor
)
{}
template
<
typename
Tuple
>
__host__
__device__
ret_type
operator
()(
Tuple
&&
t
)
const
{
return
Apply
<
thrust
::
tuple_size
<
typename
std
::
remove_reference
<
Tuple
>::
type
>::
value
>::
apply
(
functor
,
std
::
forward
<
Tuple
>
(
t
));
}
private
:
const
Functor
&
functor
;
};
}
// namespace detail
__END_TAMAAS__
#endif
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