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heap.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2026 Denis Corbin
4//
5// This program is free software; you can redistribute it and/or
6// modify it under the terms of the GNU General Public License
7// as published by the Free Software Foundation; either version 2
8// of the License, or (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with this program; if not, write to the Free Software
17// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
26
27#ifndef HEAP_HPP
28#define HEAP_HPP
29
30#include "../my_config.h"
31#include <string>
32
33#include "integers.hpp"
34#include <memory>
35#include <deque>
36#if HAVE_LIBTHREADAR_LIBTHREADAR_HPP
37#include <libthreadar/libthreadar.hpp>
38#endif
39
40 namespace libdar
41{
42
45
47
48 template <class T> class heap
49 {
50 public:
51 heap() {}; // start with an empty heap
52 heap(const heap & ref) = delete;
53 heap(heap && ref) = default;
54 heap & operator = (const heap & ref) = delete;
55 heap & operator = (heap && ref) noexcept = default;
56
57 std::unique_ptr<T> get();
58 void put(std::unique_ptr<T> && obj);
59 void put(std::deque<std::unique_ptr<T> > & list);
60 U_I get_size() const { return tas.size(); };
61
62 private:
63 std::deque<std::unique_ptr<T> > tas;
64#ifdef LIBTHREADAR_AVAILABLE
65 libthreadar::mutex access;
66#endif
67 };
68
69 template <class T> std::unique_ptr<T> heap<T>::get()
70 {
71 std::unique_ptr<T> ret;
72
73#ifdef LIBTHREADAR_AVAILABLE
74 access.lock();
75 try
76 {
77#endif
78
79 if(tas.empty())
80 throw Erange("heap::get", "heap is empty, it should have be set larger");
81
82 ret = std::move(tas.back()); // moving the object pointed to by tas.back() to ret
83 tas.pop_back(); // removing the now empty pointer at the end of 'tas'
84
85#ifdef LIBTHREADAR_AVAILABLE
86 }
87 catch(...)
88 {
89 access.unlock();
90 throw;
91 }
92 access.unlock();
93#endif
94
95 return ret;
96 }
97
98 template <class T> void heap<T>::put(std::unique_ptr<T> && obj)
99 {
100#ifdef LIBTHREADAR_AVAILABLE
101 access.lock();
102 try
103 {
104#endif
105
106 tas.push_back(std::move(obj));
107
108#ifdef LIBTHREADAR_AVAILABLE
109 }
110 catch(...)
111 {
112 access.unlock();
113 throw;
114 }
115 access.unlock();
116#endif
117 }
118
119 template <class T> void heap<T>::put(std::deque<std::unique_ptr<T> > & list)
120 {
121 typename std::deque<std::unique_ptr<T> >::iterator it = list.begin();
122
123#ifdef LIBTHREADAR_AVAILABLE
124 access.lock();
125 try
126 {
127#endif
128
129 while(it != list.end())
130 {
131 tas.push_back(std::move(*it));
132 ++it;
133 }
134
135#ifdef LIBTHREADAR_AVAILABLE
136 }
137 catch(...)
138 {
139 access.unlock();
140 throw;
141 }
142 access.unlock();
143#endif
144 }
145
147
148} // end of namespace
149
150#endif
libdar::Erange
exception used to signal range error
Definition erreurs.hpp:220
integers.hpp
are defined here basic integer types that tend to be portable
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47