source: trunk/yat/utility/Index.cc @ 1566

Last change on this file since 1566 was 1528, checked in by Peter, 13 years ago

refs #444 - started using boost::permutation_iterator for vector iterators from MatrixLookup? and also removed stride layer for const_iterator (stride was always 1).

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.0 KB
Line 
1// $Id: Index.cc 1528 2008-09-24 15:46:28Z peter $
2
3/*
4  Copyright (C) 2008 Peter Johansson
5
6  This file is part of the yat library, http://dev.thep.lu.se/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 3 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with yat. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "Index.h"
23
24#include <cassert>
25
26namespace theplu {
27namespace yat {
28namespace utility { 
29
30  Index::Index(void)
31    : index_(SmartPtr<const std::vector<size_t> >(new std::vector<size_t>))
32  {}
33
34
35  Index::Index(size_t n)
36  {
37    std::vector<size_t>* vec = new std::vector<size_t>;
38    vec->reserve(n);
39    for (size_t i=0; i<n; ++i)
40      vec->push_back(i);
41    index_ = SmartPtr<const std::vector<size_t> >(vec);
42  }
43
44
45  Index::Index(const SmartPtr<const std::vector<size_t> >& sp)
46    : index_(sp) {}
47
48
49  Index::Index(const std::vector<size_t>& vec)
50    : index_(utility::SmartPtr<const std::vector<size_t> >
51             (new std::vector<size_t>(vec))) 
52  {}
53
54
55  Index::Index(const Index& a, const Index& b)
56  {
57    std::vector<size_t>* vec = new std::vector<size_t>;
58    vec->reserve(b.size());
59    for (size_t i=0; i<b.size(); ++i) {
60      assert(b[i]<a.size());
61      vec->push_back(a[b[i]]);
62    }
63    index_ = SmartPtr<const std::vector<size_t> >(vec);
64  }
65
66
67  Index::const_iterator Index::begin(void) const
68  {
69    return index_->begin();
70  }
71
72
73  Index::const_iterator Index::end(void) const
74  {
75    return index_->end();
76  }
77
78
79  size_t Index::size(void) const
80  {
81    return index_->size();
82  }
83
84
85  const std::vector<size_t>& Index::vector(void) const
86  {
87    return *index_;
88  }
89
90
91  const size_t& Index::operator[](size_t i) const
92  {
93    return (*index_)[i];
94  }
95
96}}} // of namespace utility, yat, and theplu
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