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rTAMAAS tamaas
loop_utils.hh
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-2020 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __LOOP_UTILS_HH__
#define __LOOP_UTILS_HH__
/* -------------------------------------------------------------------------- */
#include "loop.hh"
#include "tamaas.hh"
#include <thrust/functional.h>
#include <limits>
#include <type_traits>
/* -------------------------------------------------------------------------- */
namespace
tamaas
{
namespace
detail
{
template
<
bool
only_points
=
false
,
typename
...
Grids
>
UInt
loopSize
(
Grids
&&
...
grids
)
{
return
(
only_points
)
?
std
::
get
<
0
>
(
std
::
forward_as_tuple
(
grids
...)).
getNbPoints
()
:
std
::
get
<
0
>
(
std
::
forward_as_tuple
(
grids
...)).
dataSize
();
}
template
<
typename
...
Sizes
>
void
areAllEqual
(
bool
,
UInt
)
{}
template
<
typename
...
Sizes
>
void
areAllEqual
(
bool
result
,
UInt
prev
,
UInt
current
)
{
if
(
!
(
result
&&
prev
==
current
))
TAMAAS_EXCEPTION
(
"Cannot loop over ranges that do not have the same size!"
);
}
template
<
typename
...
Sizes
>
void
areAllEqual
(
bool
result
,
UInt
prev
,
UInt
current
,
Sizes
...
rest
)
{
areAllEqual
(
result
&&
prev
==
current
,
current
,
rest
...);
}
}
// namespace detail
template
<
typename
...
Ranges
>
void
checkLoopSize
(
Ranges
&&
...
ranges
)
{
detail
::
areAllEqual
(
true
,
(
ranges
.
end
()
-
ranges
.
begin
())...);
}
namespace
detail
{
template
<
operation
op
,
typename
ReturnType
>
struct
reduction_helper
;
template
<
typename
ReturnType
>
struct
reduction_helper
<
operation
::
plus
,
ReturnType
>
:
public
thrust
::
plus
<
ReturnType
>
{
ReturnType
init
()
const
{
return
ReturnType
(
0
);
}
};
template
<
typename
ReturnType
>
struct
reduction_helper
<
operation
::
times
,
ReturnType
>
:
public
thrust
::
multiplies
<
ReturnType
>
{
ReturnType
init
()
const
{
return
ReturnType
(
1
);
}
};
template
<
typename
ReturnType
>
struct
reduction_helper
<
operation
::
min
,
ReturnType
>
:
public
thrust
::
minimum
<
ReturnType
>
{
ReturnType
init
()
const
{
return
std
::
numeric_limits
<
ReturnType
>::
max
();
}
};
template
<
typename
ReturnType
>
struct
reduction_helper
<
operation
::
max
,
ReturnType
>
:
public
thrust
::
maximum
<
ReturnType
>
{
ReturnType
init
()
const
{
return
std
::
numeric_limits
<
ReturnType
>::
lowest
();
}
};
}
// namespace detail
}
// namespace tamaas
#endif
// __LOOP_UTILS_HH
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