1 | /* $Id: shared_ptr.h 96407 2022-08-22 17:43:14Z vboxsync $ */
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2 | /** @file
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3 | * Simplified shared pointer.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2013-2022 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 | #ifndef VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
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29 | #define VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
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30 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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31 | # pragma once
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32 | #endif
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33 |
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34 | #ifdef __cplusplus
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35 | template<typename T>
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36 | class SharedPtr
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37 | {
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38 | struct imp
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39 | {
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40 | imp(T *pTrg = NULL, int cnt = 1): ptr(pTrg),refcnt(cnt){}
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41 | ~imp() { if (ptr) delete ptr;}
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42 |
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43 | T *ptr;
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44 | int refcnt;
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45 | };
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46 |
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47 |
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48 | public:
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49 | SharedPtr(T *t = NULL):p(NULL)
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50 | {
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51 | p = new imp(t);
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52 | }
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53 |
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54 | ~SharedPtr()
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55 | {
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56 | p->refcnt--;
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57 |
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58 | if (p->refcnt == 0)
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59 | delete p;
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60 | }
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61 |
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62 |
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63 | SharedPtr(const SharedPtr& rhs)
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64 | {
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65 | p = rhs.p;
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66 | p->refcnt++;
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67 | }
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68 |
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69 | const SharedPtr& operator= (const SharedPtr& rhs)
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70 | {
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71 | if (p == rhs.p) return *this;
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72 |
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73 | p->refcnt--;
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74 | if (p->refcnt == 0)
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75 | delete p;
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76 |
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77 | p = rhs.p;
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78 | p->refcnt++;
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79 |
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80 | return *this;
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81 | }
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82 |
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83 |
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84 | T *get() const
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85 | {
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86 | return p->ptr;
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87 | }
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88 |
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89 |
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90 | T *operator->()
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91 | {
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92 | return p->ptr;
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93 | }
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94 |
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95 |
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96 | const T*operator->() const
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97 | {
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98 | return p->ptr;
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99 | }
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100 |
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101 |
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102 | int use_count()
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103 | {
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104 | return p->refcnt;
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105 | }
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106 |
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107 | private:
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108 | imp *p;
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109 | };
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110 | #endif
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111 |
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112 | #endif /* !VBOX_INCLUDED_SRC_NetLib_shared_ptr_h */
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