Last change
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1 | /* $Id: shared_ptr.h 82968 2020-02-04 10:35:17Z 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) 2013-2020 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | #ifndef VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
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19 | #define VBOX_INCLUDED_SRC_NetLib_shared_ptr_h
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20 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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21 | # pragma once
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22 | #endif
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23 |
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24 | #ifdef __cplusplus
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25 | template<typename T>
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26 | class SharedPtr
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27 | {
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28 | struct imp
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29 | {
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30 | imp(T *pTrg = NULL, int cnt = 1): ptr(pTrg),refcnt(cnt){}
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31 | ~imp() { if (ptr) delete ptr;}
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32 |
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33 | T *ptr;
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34 | int refcnt;
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35 | };
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36 |
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37 |
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38 | public:
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39 | SharedPtr(T *t = NULL):p(NULL)
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40 | {
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41 | p = new imp(t);
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42 | }
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43 |
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44 | ~SharedPtr()
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45 | {
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46 | p->refcnt--;
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47 |
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48 | if (p->refcnt == 0)
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49 | delete p;
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50 | }
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51 |
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52 |
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53 | SharedPtr(const SharedPtr& rhs)
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54 | {
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55 | p = rhs.p;
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56 | p->refcnt++;
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57 | }
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58 |
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59 | const SharedPtr& operator= (const SharedPtr& rhs)
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60 | {
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61 | if (p == rhs.p) return *this;
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62 |
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63 | p->refcnt--;
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64 | if (p->refcnt == 0)
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65 | delete p;
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66 |
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67 | p = rhs.p;
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68 | p->refcnt++;
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69 |
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70 | return *this;
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71 | }
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72 |
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73 |
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74 | T *get() const
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75 | {
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76 | return p->ptr;
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77 | }
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78 |
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79 |
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80 | T *operator->()
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81 | {
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82 | return p->ptr;
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83 | }
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84 |
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85 |
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86 | const T*operator->() const
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87 | {
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88 | return p->ptr;
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89 | }
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90 |
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91 |
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92 | int use_count()
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93 | {
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94 | return p->refcnt;
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95 | }
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96 |
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97 | private:
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98 | imp *p;
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99 | };
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100 | #endif
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101 |
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102 | #endif /* !VBOX_INCLUDED_SRC_NetLib_shared_ptr_h */
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