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mesh_iterators.hh
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rAKA akantu
mesh_iterators.hh
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/**
* @file mesh_iterators.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Thu Jul 16 2015
* @date last modification: Wed Jan 31 2018
*
* @brief Set of helper classes to have fun with range based for
*
*
* Copyright (©) 2015-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu 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.
*
* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_named_argument.hh"
#include "aka_static_if.hh"
#include "mesh.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MESH_ITERATORS_HH_
#define AKANTU_MESH_ITERATORS_HH_
namespace
akantu
{
class
MeshElementsByTypes
{
using
elements_iterator
=
Array
<
Element
>::
scalar_iterator
;
public
:
explicit
MeshElementsByTypes
(
const
Array
<
Element
>
&
elements
)
{
this
->
elements
.
copy
(
elements
);
std
::
sort
(
this
->
elements
.
begin
(),
this
->
elements
.
end
());
}
/* ------------------------------------------------------------------------ */
class
MeshElementsRange
{
public
:
MeshElementsRange
()
=
default
;
MeshElementsRange
(
const
elements_iterator
&
begin
,
const
elements_iterator
&
end
)
:
type
((
*
begin
).
type
),
ghost_type
((
*
begin
).
ghost_type
),
begin
(
begin
),
end
(
end
)
{}
AKANTU_GET_MACRO
(
Type
,
type
,
ElementType
);
AKANTU_GET_MACRO
(
GhostType
,
ghost_type
,
GhostType
);
const
Array
<
UInt
>
&
getElements
()
{
elements
.
resize
(
end
-
begin
);
auto
el_it
=
elements
.
begin
();
for
(
auto
it
=
begin
;
it
!=
end
;
++
it
,
++
el_it
)
{
*
el_it
=
it
->
element
;
}
return
elements
;
}
private
:
ElementType
type
{
_not_defined
};
GhostType
ghost_type
{
_casper
};
elements_iterator
begin
;
elements_iterator
end
;
Array
<
UInt
>
elements
;
};
/* ------------------------------------------------------------------------ */
class
iterator
{
struct
element_comparator
{
bool
operator
()(
const
Element
&
lhs
,
const
Element
&
rhs
)
const
{
return
((
rhs
==
ElementNull
)
||
std
::
tie
(
lhs
.
ghost_type
,
lhs
.
type
)
<
std
::
tie
(
rhs
.
ghost_type
,
rhs
.
type
));
}
};
public
:
iterator
(
const
iterator
&
)
=
default
;
iterator
(
const
elements_iterator
&
first
,
const
elements_iterator
&
last
)
:
range
(
std
::
equal_range
(
first
,
last
,
*
first
,
element_comparator
())),
first
(
first
),
last
(
last
)
{}
decltype
(
auto
)
operator
*
()
const
{
return
MeshElementsRange
(
range
.
first
,
range
.
second
);
}
iterator
operator
++
()
{
first
=
range
.
second
;
range
=
std
::
equal_range
(
first
,
last
,
*
first
,
element_comparator
());
return
*
this
;
}
bool
operator
==
(
const
iterator
&
other
)
const
{
return
(
first
==
other
.
first
and
last
==
other
.
last
);
}
bool
operator
!=
(
const
iterator
&
other
)
const
{
return
(
not
operator
==
(
other
));
}
private
:
std
::
pair
<
elements_iterator
,
elements_iterator
>
range
;
elements_iterator
first
;
elements_iterator
last
;
};
iterator
begin
()
{
return
iterator
(
elements
.
begin
(),
elements
.
end
());
}
iterator
end
()
{
return
iterator
(
elements
.
end
(),
elements
.
end
());
}
private
:
Array
<
Element
>
elements
;
};
/* -------------------------------------------------------------------------- */
namespace
mesh_iterators
{
namespace
details
{
template
<
class
internal_iterator
>
class
delegated_iterator
{
public
:
using
value_type
=
std
::
remove_pointer_t
<
typename
internal_iterator
::
value_type
::
second_type
>
;
using
difference_type
=
std
::
ptrdiff_t
;
using
pointer
=
value_type
*
;
using
reference
=
value_type
&
;
using
iterator_category
=
std
::
input_iterator_tag
;
explicit
delegated_iterator
(
internal_iterator
it
)
:
it
(
std
::
move
(
it
))
{}
decltype
(
auto
)
operator
*
()
{
return
std
::
forward
<
decltype
(
*
(
it
->
second
))
>
(
*
(
it
->
second
));
}
delegated_iterator
operator
++
()
{
++
it
;
return
*
this
;
}
bool
operator
==
(
const
delegated_iterator
&
other
)
const
{
return
other
.
it
==
it
;
}
bool
operator
!=
(
const
delegated_iterator
&
other
)
const
{
return
other
.
it
!=
it
;
}
private
:
internal_iterator
it
;
};
}
// namespace details
}
// namespace mesh_iterators
/* -------------------------------------------------------------------------- */
template
<
class
Func
>
void
for_each_element
(
UInt
nb_elements
,
const
Array
<
UInt
>
&
filter_elements
,
Func
&&
function
)
{
if
(
filter_elements
!=
empty_filter
)
{
std
::
for_each
(
filter_elements
.
begin
(),
filter_elements
.
end
(),
std
::
forward
<
Func
>
(
function
));
}
else
{
auto
&&
range
=
arange
(
nb_elements
);
std
::
for_each
(
range
.
begin
(),
range
.
end
(),
std
::
forward
<
Func
>
(
function
));
}
}
/* -------------------------------------------------------------------------- */
template
<
class
Func
,
typename
...
pack
>
void
for_each_element
(
const
Mesh
&
mesh
,
Func
&&
function
,
pack
&&
...
_pack
)
{
auto
requested_ghost_type
=
OPTIONAL_NAMED_ARG
(
ghost_type
,
_casper
);
const
ElementTypeMapArray
<
UInt
>
*
filter
=
OPTIONAL_NAMED_ARG
(
element_filter
,
nullptr
);
bool
all_ghost_types
=
requested_ghost_type
==
_casper
;
auto
spatial_dimension
=
OPTIONAL_NAMED_ARG
(
spatial_dimension
,
mesh
.
getSpatialDimension
());
auto
element_kind
=
OPTIONAL_NAMED_ARG
(
element_kind
,
_ek_not_defined
);
for
(
auto
ghost_type
:
ghost_types
)
{
if
((
not
(
ghost_type
==
requested_ghost_type
))
and
(
not
all_ghost_types
))
{
continue
;
}
auto
element_types
=
mesh
.
elementTypes
(
spatial_dimension
,
ghost_type
,
element_kind
);
if
(
filter
)
{
element_types
=
filter
->
elementTypes
(
spatial_dimension
,
ghost_type
,
element_kind
);
}
for
(
auto
type
:
element_types
)
{
const
Array
<
UInt
>
*
filter_array
;
if
(
filter
)
{
filter_array
=
&
((
*
filter
)(
type
,
ghost_type
));
}
else
{
filter_array
=
&
empty_filter
;
}
auto
nb_elements
=
mesh
.
getNbElement
(
type
,
ghost_type
);
for_each_element
(
nb_elements
,
*
filter_array
,
[
&
](
auto
&&
el
)
{
auto
element
=
Element
{
type
,
el
,
ghost_type
};
std
::
forward
<
Func
>
(
function
)(
element
);
});
}
}
}
}
// namespace akantu
#endif
/* AKANTU_MESH_ITERATORS_HH_ */
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