Newer
Older
Christian Godenschwager
committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
//======================================================================================================================
//
// This file is part of waLBerla. waLBerla is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// waLBerla 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 General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
//
//! \file ConcatIterator.h
//! \ingroup core
//! \author Florian Schornbaum <florian.schornbaum@fau.de>
//! \author Christoph Rettinger <christoph.rettinger@fau.de>
//! \author Sebastian Eibl <sebastian.eibl@fau.de>
//======================================================================================================================
#pragma once
#include <iterator>
namespace walberla {
template< typename T >
class ConcatIterator : public std::iterator< std::input_iterator_tag, typename T::value_type, typename T::difference_type, typename T::pointer, typename T::reference >
{
public:
/// default constructed iterator points to end()
ConcatIterator( )
: ended_( true )
{}
ConcatIterator( const T& beginFirst,
const T& endFirst,
const T& beginSecond,
const T& endSecond )
: it_(beginFirst)
, itEndFirst_(endFirst)
, itBeginSecond_(beginSecond)
, itEndSecond_(endSecond)
, first_(true)
, ended_(false)
{
checkStateAndAdapt();
}
ConcatIterator& operator++() { ++it_; checkStateAndAdapt(); return *this; } // prefix ++X
ConcatIterator operator++(int) { ConcatIterator it( *this ); operator++(); return it; }; // postfix X++
bool operator==( const ConcatIterator& rhs ) const
{
if (ended_ || rhs.ended_)
{
if (ended_ == rhs.ended_)
{
return true;
}
else
{
return false;
}
}
return it_ == rhs.it_;
}
bool operator!=( const ConcatIterator & rhs ) const { return !(*this == rhs); }
typename T::reference operator*() { return it_.operator*(); }
typename T::pointer operator->() { return it_.operator->(); }
private:
/// checks if iterator has to jump to second range
void checkStateAndAdapt()
{
if( first_ && it_ == itEndFirst_ )
{
it_ = itBeginSecond_;
first_ = false;
}
if( !first_ && it_ == itEndSecond_ )
{
ended_ = true;
}
}
/// current position
T it_;
/// end of first range
const T itEndFirst_;
/// begin of second range
const T itBeginSecond_;
/// end of second range
const T itEndSecond_;
///located in first range?
bool first_;
/// end reached?
bool ended_;
};
} // namespace walberla