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rAKA akantu
aka_repeat_iterator.hh
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/**
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* akantu-iterators 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-iterators 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-iterators. If not, see <http://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------- */
#include "iterators/aka_iterator_tools.hh"
/* -------------------------------------------------------------------------- */
#include <cmath>
#include <utility>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_REPEAT_ITERATOR_HH
#define AKANTU_AKA_REPEAT_ITERATOR_HH
namespace
AKANTU_ITERATORS_NAMESPACE
{
namespace
iterators
AKA_ITERATOR_EXPORT_NAMESPACE
{
template
<
class
Iterator
,
typename
N
>
class
RepeatNIterator
:
public
details
::
CopyAssignmentEnabler
<
aka
::
conjunction
<
std
::
is_copy_assignable
<
Iterator
>
,
std
::
is_copy_constructible
<
Iterator
>>::
value
>
,
public
details
::
MoveAssignmentEnabler
<
aka
::
conjunction
<
std
::
is_move_assignable
<
Iterator
>
,
std
::
is_move_constructible
<
Iterator
>>::
value
>
{
private
:
using
it_traits
=
typename
std
::
iterator_traits
<
Iterator
>
;
public
:
using
value_type
=
typename
it_traits
::
value_type
;
using
difference_type
=
typename
it_traits
::
difference_type
;
using
pointer
=
typename
it_traits
::
pointer
;
using
reference
=
typename
it_traits
::
reference
;
using
iterator_category
=
typename
it_traits
::
iterator_category
;
explicit
RepeatNIterator
(
Iterator
iterator
,
N
n
)
:
iterator
(
std
::
move
(
iterator
)),
n
(
std
::
move
(
n
))
{}
// input iterator ++it
auto
operator
++
()
->
RepeatNIterator
&
{
++
i
;
if
(
i
==
n
)
{
++
iterator
;
i
=
0
;
}
return
*
this
;
}
// input iterator it++
auto
operator
++
(
int
)
->
RepeatNIterator
{
auto
cpy
=
*
this
;
this
->
operator
++
();
return
cpy
;
}
// input iterator it != other_it
auto
operator
!=
(
const
RepeatNIterator
&
other
)
const
->
bool
{
return
iterator
!=
other
.
iterator
or
i
!=
other
.
i
;
}
// input iterator dereference *it
auto
operator
*
()
->
decltype
(
auto
)
{
return
*
iterator
;
}
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
bidirectional_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
--
()
->
RepeatNIterator
&
{
if
(
i
==
0
)
{
--
iterator
;
i
=
n
-
1
;
}
else
{
--
i
;
}
return
*
this
;
}
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
bidirectional_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
--
(
int
)
->
RepeatNIterator
{
auto
cpy
=
*
this
;
this
->
operator
--
();
return
cpy
;
}
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
random_access_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
-
(
const
RepeatNIterator
&
other
)
const
->
difference_type
{
return
(
iterator
-
other
.
iterator
)
+
(
i
-
other
.
i
);
}
// random iterator it[idx]
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
random_access_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
[](
const
N
&
idx
)
->
decltype
(
auto
)
{
return
iterator
[(
i
+
idx
)
/
n
];
}
// random iterator it + n
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
random_access_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
+
(
const
N
&
n_
)
const
->
decltype
(
auto
)
{
auto
it
=
RepeatNIterator
(
iterator
+
n_
/
n
,
n
);
it
.
i
=
(
i
+
n_
)
%
n
;
return
it
;
}
// random iterator it - n
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
random_access_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
-
(
const
N
&
n_
)
const
->
decltype
(
auto
)
{
auto
it
=
RepeatNIterator
(
iterator
+
N
(
std
::
floor
(
double
(
-
n_
)
/
n
)),
n
);
it
.
i
=
(
i
+
n
-
n_
)
%
n
;
return
it
;
}
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
forward_iterator_tag
>::
value
>
*
=
nullptr
>
auto
operator
==
(
const
RepeatNIterator
&
other
)
const
->
bool
{
return
not
this
->
operator
!=
(
other
);
}
private
:
Iterator
iterator
;
const
N
n
;
N
i
{
0
};
};
template
<
class
Iterator
,
typename
N
>
inline
constexpr
auto
repeat_n
(
Iterator
&&
iterator
,
N
n
)
->
decltype
(
auto
)
{
return
RepeatNIterator
<
Iterator
,
N
>
(
std
::
forward
<
Iterator
>
(
iterator
),
std
::
move
(
n
));
}
}
// namespace AKA_ITERATOR_EXPORT_NAMESPACE
namespace
containers
AKA_ITERATOR_EXPORT_NAMESPACE
{
template
<
class
Container
,
typename
N
>
class
RepeatNContainer
{
public
:
using
size_type
=
typename
std
::
decay_t
<
Container
>::
size_type
;
explicit
RepeatNContainer
(
Container
&&
container
,
N
n
)
:
container
(
std
::
forward
<
Container
>
(
container
)),
n
(
std
::
move
(
n
))
{}
auto
begin
()
->
decltype
(
auto
)
{
return
iterators
::
repeat_n
(
container
.
begin
(),
n
);
}
auto
begin
()
const
->
decltype
(
auto
)
{
return
iterators
::
repeat_n
(
container
.
begin
(),
n
);
}
auto
end
()
->
decltype
(
auto
)
{
return
iterators
::
repeat_n
(
container
.
end
(),
n
);
}
auto
end
()
const
->
decltype
(
auto
)
{
return
iterators
::
repeat_n
(
container
.
end
(),
n
);
}
private
:
Container
container
;
N
n
;
};
}
// namespace AKA_ITERATOR_EXPORT_NAMESPACE
template
<
class
Container
,
typename
N
>
inline
constexpr
auto
repeat_n
(
Container
&&
container
,
N
n
)
->
decltype
(
auto
)
{
return
containers
::
RepeatNContainer
<
Container
,
N
>
(
std
::
forward
<
Container
>
(
container
),
std
::
move
(
n
));
}
}
// namespace AKANTU_ITERATORS_NAMESPACE
namespace
std
{
template
<
class
Iterator
,
typename
N
>
struct
iterator_traits
<
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
RepeatNIterator
<
Iterator
,
N
>>
{
private
:
using
iterator_type
=
typename
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
RepeatNIterator
<
Iterator
,
N
>
;
public
:
using
iterator_category
=
typename
iterator_type
::
iterator_category
;
using
value_type
=
typename
iterator_type
::
value_type
;
using
difference_type
=
typename
iterator_type
::
difference_type
;
using
pointer
=
typename
iterator_type
::
pointer
;
using
reference
=
typename
iterator_type
::
reference
;
};
}
// namespace std
#endif
/* AKANTU_AKA_REPEAT_ITERATOR_HH */
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