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aka_enumerate_iterator.hh
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rAKA akantu
aka_enumerate_iterator.hh
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/**
* @file aka_enumerate_iterator.hh
*
* @author Nicolas Richart
*
* @date creation jeu déc 12 2019
*
* @brief implementation of enumerate.
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "iterators/aka_zip_iterator.hh"
/* -------------------------------------------------------------------------- */
#include <iterator>
#include <utility>
/* -------------------------------------------------------------------------- */
#ifndef AKA_ENUMERATE_ITERATOR_HH
#define AKA_ENUMERATE_ITERATOR_HH
#ifndef AKANTU_ITERATORS_NAMESPACE
#define AKANTU_ITERATORS_NAMESPACE akantu
#endif
namespace
AKANTU_ITERATORS_NAMESPACE
{
/* -------------------------------------------------------------------------- */
namespace
iterators
{
template
<
class
Iterator
>
class
EnumerateIterator
{
public
:
using
value_type
=
std
::
tuple
<
std
::
size_t
,
typename
std
::
iterator_traits
<
Iterator
>::
value_type
>
;
using
difference_type
=
std
::
size_t
;
using
pointer
=
std
::
tuple
<
std
::
size_t
,
typename
std
::
iterator_traits
<
Iterator
>::
pointer
>
;
using
reference
=
std
::
tuple
<
std
::
size_t
,
typename
std
::
iterator_traits
<
Iterator
>::
reference
>
;
using
iterator_category
=
std
::
input_iterator_tag
;
public
:
explicit
EnumerateIterator
(
Iterator
&&
iterator
)
:
iterator
(
iterator
)
{}
// input iterator ++it
EnumerateIterator
&
operator
++
()
{
++
iterator
;
++
index
;
return
*
this
;
}
// input iterator it++
EnumerateIterator
operator
++
(
int
)
{
auto
cpy
=
*
this
;
this
->
operator
++
();
return
cpy
;
}
// input iterator it != other_it
bool
operator
!=
(
const
EnumerateIterator
&
other
)
const
{
return
iterator
!=
other
.
iterator
;
}
// input iterator dereference *it
decltype
(
auto
)
operator
*
()
{
return
std
::
tuple_cat
(
std
::
make_tuple
(
index
),
*
iterator
);
}
bool
operator
==
(
const
EnumerateIterator
&
other
)
const
{
return
not
this
->
operator
!=
(
other
);
}
private
:
Iterator
iterator
;
size_t
index
{
0
};
};
template
<
class
Iterator
>
inline
constexpr
decltype
(
auto
)
enumerate
(
Iterator
&&
iterator
)
{
return
EnumerateIterator
<
Iterator
>
(
std
::
forward
<
Iterator
>
(
iterator
));
}
}
// namespace iterators
namespace
containers
{
template
<
class
...
Containers
>
class
EnumerateContainer
{
public
:
explicit
EnumerateContainer
(
Containers
&&
...
containers
)
:
zip_container
(
std
::
forward
<
Containers
>
(
containers
)...)
{}
decltype
(
auto
)
begin
()
{
return
iterators
::
enumerate
(
zip_container
.
begin
());
}
decltype
(
auto
)
begin
()
const
{
return
iterators
::
enumerate
(
zip_container
.
begin
());
}
decltype
(
auto
)
end
()
{
return
iterators
::
enumerate
(
zip_container
.
end
());
}
decltype
(
auto
)
end
()
const
{
return
iterators
::
enumerate
(
zip_container
.
end
());
}
private
:
ZipContainer
<
Containers
...
>
zip_container
;
};
}
// namespace containers
template
<
class
...
Container
>
inline
constexpr
decltype
(
auto
)
enumerate
(
Container
&&
...
container
)
{
return
containers
::
EnumerateContainer
<
Container
...
>
(
std
::
forward
<
Container
>
(
container
)...);
}
}
// namespace AKANTU_ITERATORS_NAMESPACE
namespace
std
{
template
<
class
Iterator
>
struct
iterator_traits
<
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
EnumerateIterator
<
Iterator
>>
{
private
:
using
iterator_type
=
typename
::
AKANTU_ITERATORS_NAMESPACE
::
iterators
::
EnumerateIterator
<
Iterator
>
;
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_ENUMERATE_ITERATOR_HH */
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