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aka_concatenate_iterator.hh
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rAKA akantu
aka_concatenate_iterator.hh
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/**
* @file aka_concatenate_iterator.hh
*
* @author Nicolas Richart
*
* @date creation jeu déc 12 2019
*
* @brief implementation of arange
*
*
* 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 "aka_compatibilty_with_cpp_standard.hh"
#include "aka_iterator_tools.hh"
#include "aka_tuple_tools.hh"
/* -------------------------------------------------------------------------- */
#include <iterator>
#include <utility>
/* -------------------------------------------------------------------------- */
#ifndef AKA_CONCATENATE_ITERATOR_H
#define AKA_CONCATENATE_ITERATOR_H
namespace
AKANTU_ITERATORS_NAMESPACE
{
namespace
iterators
AKA_ITERATOR_EXPORT_NAMESPACE
{
/* ------------------------------------------------------------------------ */
template
<
class
...
Iterators
>
class
ConcatIterator
:
public
details
::
CopyAssignmentEnabler
<
aka
::
conjunction
<
std
::
is_copy_assignable
<
Iterators
>
...,
std
::
is_copy_constructible
<
Iterators
>
...
>::
value
>
,
public
details
::
MoveAssignmentEnabler
<
aka
::
conjunction
<
std
::
is_move_assignable
<
Iterators
>
...,
std
::
is_move_constructible
<
Iterators
>
...
>::
value
>
{
private
:
using
tuple_t
=
std
::
tuple
<
Iterators
...
>
;
public
:
using
value_type
=
std
::
tuple
<
typename
std
::
iterator_traits
<
Iterators
>::
value_type
...
>
;
using
difference_type
=
std
::
common_type_t
<
typename
std
::
iterator_traits
<
Iterators
>::
difference_type
...
>
;
using
pointer
=
std
::
tuple
<
typename
std
::
iterator_traits
<
Iterators
>::
pointer
...
>
;
using
reference
=
std
::
tuple
<
typename
std
::
iterator_traits
<
Iterators
>::
reference
...
>
;
using
iterator_category
=
std
::
input_iterator_tag
;
public
:
explicit
ConcatIterator
(
tuple_t
iterators
,
tuple_t
end_iterators
)
:
iterators
(
std
::
move
(
iterators
)),
end_iterators
(
std
::
move
(
end_iterators
))
{}
/* ---------------------------------------------------------------------- */
// input iterator ++it
ConcatIterator
&
operator
++
()
{
auto
&&
ends
=
tuple
::
transform
([](
auto
&&
a
,
auto
&&
b
)
{
return
a
==
b
;
},
iterators
,
end_iterators
);
auto
&&
pos
=
tuple
::
find
(
ends
,
false
);
++
(
tuple
::
dynamic_get
(
pos
,
iterators
));
return
*
this
;
}
// input iterator it++
ConcatIterator
operator
++
(
int
)
{
auto
cpy
=
*
this
;
this
->
operator
++
();
return
cpy
;
}
// input iterator it != other_it
bool
operator
!=
(
const
ConcatIterator
&
other
)
const
{
return
tuple
::
are_not_equal
(
iterators
,
other
.
iterators
);
}
// input iterator dereference *it
decltype
(
auto
)
operator
*
()
{
auto
&&
ends
=
tuple
::
transform
([](
auto
&&
a
,
auto
&&
b
)
{
return
a
==
b
;
},
iterators
,
end_iterators
);
auto
&&
pos
=
tuple
::
find
(
ends
,
false
);
return
*
(
tuple
::
dynamic_get
(
pos
,
iterators
));
}
template
<
class
iterator_category_
=
iterator_category
,
std
::
enable_if_t
<
aka
::
is_iterator_category_at_least
<
iterator_category_
,
std
::
forward_iterator_tag
>::
value
>
*
=
nullptr
>
bool
operator
==
(
const
ConcatIterator
&
other
)
const
{
return
not
tuple
::
are_not_equal
(
iterators
,
other
.
iterators
);
}
private
:
tuple_t
iterators
;
tuple_t
end_iterators
;
};
}
// namespace AKA_ITERATOR_EXPORT_NAMESPACE
/* -------------------------------------------------------------------------- */
template
<
class
...
Iterators
>
decltype
(
auto
)
concat_iterator
(
std
::
tuple
<
Iterators
...
>
&&
iterators_tuple
,
std
::
tuple
<
Iterators
...
>
&&
end_iterators_tuple
)
{
auto
concat
=
iterators
::
ConcatIterator
<
Iterators
...
>
(
std
::
forward
<
decltype
(
iterators_tuple
)
>
(
iterators_tuple
),
std
::
forward
<
decltype
(
end_iterators_tuple
)
>
(
end_iterators_tuple
));
return
concat
;
}
/* -------------------------------------------------------------------------- */
namespace
containers
AKA_ITERATOR_EXPORT_NAMESPACE
{
template
<
class
...
Containers
>
class
ConcatContainer
{
using
containers_t
=
std
::
tuple
<
Containers
...
>
;
public
:
using
size_type
=
std
::
common_type_t
<
aka
::
size_type_t
<
Containers
>
...
>
;
explicit
ConcatContainer
(
Containers
&&
...
containers
)
:
containers
(
std
::
forward
<
Containers
>
(
containers
)...)
{}
auto
begin
()
const
->
decltype
(
auto
)
{
return
concat_iterator
(
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
begin
();
},
std
::
forward
<
containers_t
>
(
containers
)),
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)));
}
auto
end
()
const
->
decltype
(
auto
)
{
return
concat_iterator
(
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)),
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)));
}
auto
begin
()
->
decltype
(
auto
)
{
return
concat_iterator
(
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
begin
();
},
std
::
forward
<
containers_t
>
(
containers
)),
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)));
}
auto
end
()
->
decltype
(
auto
)
{
return
concat_iterator
(
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)),
tuple
::
transform
([](
auto
&&
c
)
{
return
c
.
end
();
},
std
::
forward
<
containers_t
>
(
containers
)));
}
private
:
containers_t
containers
;
};
/* ------------------------------------------------------------------------ */
template
<
class
...
Containers
>
auto
concat
(
Containers
&&
...
conts
)
->
decltype
(
auto
)
{
return
containers
::
ConcatContainer
<
Containers
...
>
(
std
::
forward
<
Containers
>
(
conts
)...);
}
}
// namespace AKA_ITERATOR_EXPORT_NAMESPACE
}
// namespace AKANTU_ITERATORS_NAMESPACE
namespace
std
{
template
<
typename
...
Its
>
struct
iterator_traits
<
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
ConcatIterator
<
Its
...
>>
{
private
:
using
iterator_type
=
typename
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
ConcatIterator
<
Its
...
>
;
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
// __AKA_CONCATENATE_ITERATOR_H_
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