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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/ScopedPointer.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DISTRHO_SCOPED_POINTER_HPP_INCLUDED
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18 #define DISTRHO_SCOPED_POINTER_HPP_INCLUDED
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19
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20 #include "../DistrhoUtils.hpp"
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21
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22 #include <algorithm>
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23
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24 START_NAMESPACE_DISTRHO
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25
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26 // -----------------------------------------------------------------------
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27 // The following code was based from juce-core ScopedPointer class
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28
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29 /**
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30 Copyright (C) 2013 Raw Material Software Ltd.
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31
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32 Permission is granted to use this software under the terms of the ISC license
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33 http://www.isc.org/downloads/software-support-policy/isc-license/
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34
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35 Permission to use, copy, modify, and/or distribute this software for any
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36 purpose with or without fee is hereby granted, provided that the above
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37 copyright notice and this permission notice appear in all copies.
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38
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39 THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
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40 TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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41 FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
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42 OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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43 USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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44 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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45 OF THIS SOFTWARE.
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46 */
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47
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48 //==============================================================================
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49 /**
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50 This class holds a pointer which is automatically deleted when this object goes
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51 out of scope.
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52
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53 Once a pointer has been passed to a ScopedPointer, it will make sure that the pointer
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54 gets deleted when the ScopedPointer is deleted. Using the ScopedPointer on the stack or
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55 as member variables is a good way to use RAII to avoid accidentally leaking dynamically
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56 created objects.
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57
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58 A ScopedPointer can be used in pretty much the same way that you'd use a normal pointer
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59 to an object. If you use the assignment operator to assign a different object to a
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60 ScopedPointer, the old one will be automatically deleted.
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61
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62 A const ScopedPointer is guaranteed not to lose ownership of its object or change the
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63 object to which it points during its lifetime. This means that making a copy of a const
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64 ScopedPointer is impossible, as that would involve the new copy taking ownership from the
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65 old one.
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66
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67 If you need to get a pointer out of a ScopedPointer without it being deleted, you
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68 can use the release() method.
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69
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70 Something to note is the main difference between this class and the std::auto_ptr class,
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71 which is that ScopedPointer provides a cast-to-object operator, wheras std::auto_ptr
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72 requires that you always call get() to retrieve the pointer. The advantages of providing
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73 the cast is that you don't need to call get(), so can use the ScopedPointer in pretty much
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74 exactly the same way as a raw pointer. The disadvantage is that the compiler is free to
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75 use the cast in unexpected and sometimes dangerous ways - in particular, it becomes difficult
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76 to return a ScopedPointer as the result of a function. To avoid this causing errors,
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77 ScopedPointer contains an overloaded constructor that should cause a syntax error in these
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78 circumstances, but it does mean that instead of returning a ScopedPointer from a function,
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79 you'd need to return a raw pointer (or use a std::auto_ptr instead).
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80 */
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81 template<class ObjectType>
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82 class ScopedPointer
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83 {
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84 public:
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85 //==============================================================================
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86 /** Creates a ScopedPointer containing a null pointer. */
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87 ScopedPointer() noexcept
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88 : object(nullptr) {}
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89
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90 /** Creates a ScopedPointer that owns the specified object. */
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91 ScopedPointer(ObjectType* const objectToTakePossessionOf) noexcept
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92 : object(objectToTakePossessionOf) {}
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93
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94 /** Creates a ScopedPointer that takes its pointer from another ScopedPointer.
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95
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96 Because a pointer can only belong to one ScopedPointer, this transfers
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97 the pointer from the other object to this one, and the other object is reset to
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98 be a null pointer.
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99 */
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100 ScopedPointer(ScopedPointer& objectToTransferFrom) noexcept
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101 : object(objectToTransferFrom.object)
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102 {
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103 objectToTransferFrom.object = nullptr;
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104 }
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105
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106 /** Destructor.
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107 This will delete the object that this ScopedPointer currently refers to.
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108 */
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109 ~ScopedPointer()
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110 {
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111 delete object;
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112 }
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113
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114 /** Changes this ScopedPointer to point to a new object.
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115
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116 Because a pointer can only belong to one ScopedPointer, this transfers
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117 the pointer from the other object to this one, and the other object is reset to
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118 be a null pointer.
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119
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diff changeset
120 If this ScopedPointer already points to an object, that object
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
121 will first be deleted.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
122 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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parents:
diff changeset
123 ScopedPointer& operator=(ScopedPointer& objectToTransferFrom)
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parents:
diff changeset
124 {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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diff changeset
125 if (this != objectToTransferFrom.getAddress())
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prymula <prymula76@outlook.com>
parents:
diff changeset
126 {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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diff changeset
127 // Two ScopedPointers should never be able to refer to the same object - if
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parents:
diff changeset
128 // this happens, you must have done something dodgy!
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parents:
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129 DISTRHO_SAFE_ASSERT_RETURN(object == nullptr || object != objectToTransferFrom.object, *this);
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diff changeset
130
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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diff changeset
131 ObjectType* const oldObject = object;
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132 object = objectToTransferFrom.object;
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133 objectToTransferFrom.object = nullptr;
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134 delete oldObject;
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prymula <prymula76@outlook.com>
parents:
diff changeset
135 }
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parents:
diff changeset
136
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
137 return *this;
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prymula <prymula76@outlook.com>
parents:
diff changeset
138 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
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diff changeset
139
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prymula <prymula76@outlook.com>
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diff changeset
140 /** Changes this ScopedPointer to point to a new object.
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diff changeset
141
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diff changeset
142 If this ScopedPointer already points to an object, that object
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parents:
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143 will first be deleted.
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prymula <prymula76@outlook.com>
parents:
diff changeset
144
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145 The pointer that you pass in may be a nullptr.
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parents:
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146 */
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diff changeset
147 ScopedPointer& operator=(ObjectType* const newObjectToTakePossessionOf)
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148 {
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diff changeset
149 if (object != newObjectToTakePossessionOf)
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parents:
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150 {
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diff changeset
151 ObjectType* const oldObject = object;
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parents:
diff changeset
152 object = newObjectToTakePossessionOf;
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prymula <prymula76@outlook.com>
parents:
diff changeset
153 delete oldObject;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
154 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
155
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prymula <prymula76@outlook.com>
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diff changeset
156 return *this;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
157 }
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parents:
diff changeset
158
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prymula <prymula76@outlook.com>
parents:
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159 //==============================================================================
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prymula <prymula76@outlook.com>
parents:
diff changeset
160 /** Returns the object that this ScopedPointer refers to. */
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prymula <prymula76@outlook.com>
parents:
diff changeset
161 operator ObjectType*() const noexcept { return object; }
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prymula <prymula76@outlook.com>
parents:
diff changeset
162
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prymula <prymula76@outlook.com>
parents:
diff changeset
163 /** Returns the object that this ScopedPointer refers to. */
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prymula <prymula76@outlook.com>
parents:
diff changeset
164 ObjectType* get() const noexcept { return object; }
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prymula <prymula76@outlook.com>
parents:
diff changeset
165
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prymula <prymula76@outlook.com>
parents:
diff changeset
166 /** Returns the object that this ScopedPointer refers to. */
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prymula <prymula76@outlook.com>
parents:
diff changeset
167 ObjectType& getObject() const noexcept { return *object; }
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prymula <prymula76@outlook.com>
parents:
diff changeset
168
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
169 /** Returns the object that this ScopedPointer refers to. */
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parents:
diff changeset
170 ObjectType& operator*() const noexcept { return *object; }
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parents:
diff changeset
171
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prymula <prymula76@outlook.com>
parents:
diff changeset
172 /** Lets you access methods and properties of the object that this ScopedPointer refers to. */
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prymula <prymula76@outlook.com>
parents:
diff changeset
173 ObjectType* operator->() const noexcept { return object; }
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parents:
diff changeset
174
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prymula <prymula76@outlook.com>
parents:
diff changeset
175 //==============================================================================
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prymula <prymula76@outlook.com>
parents:
diff changeset
176 /** Removes the current object from this ScopedPointer without deleting it.
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prymula <prymula76@outlook.com>
parents:
diff changeset
177 This will return the current object, and set the ScopedPointer to a null pointer.
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prymula <prymula76@outlook.com>
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diff changeset
178 */
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prymula <prymula76@outlook.com>
parents:
diff changeset
179 ObjectType* release() noexcept { ObjectType* const o = object; object = nullptr; return o; }
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diff changeset
180
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prymula <prymula76@outlook.com>
parents:
diff changeset
181 //==============================================================================
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
182 /** Swaps this object with that of another ScopedPointer.
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prymula <prymula76@outlook.com>
parents:
diff changeset
183 The two objects simply exchange their pointers.
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prymula <prymula76@outlook.com>
parents:
diff changeset
184 */
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prymula <prymula76@outlook.com>
parents:
diff changeset
185 void swapWith(ScopedPointer<ObjectType>& other) noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
186 {
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parents:
diff changeset
187 // Two ScopedPointers should never be able to refer to the same object - if
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
188 // this happens, you must have done something dodgy!
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prymula <prymula76@outlook.com>
parents:
diff changeset
189 DISTRHO_SAFE_ASSERT_RETURN(object != other.object || this == other.getAddress() || object == nullptr,);
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prymula <prymula76@outlook.com>
parents:
diff changeset
190
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prymula <prymula76@outlook.com>
parents:
diff changeset
191 std::swap(object, other.object);
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prymula <prymula76@outlook.com>
parents:
diff changeset
192 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
193
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
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diff changeset
194 private:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
195 //==============================================================================
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
196 ObjectType* object;
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prymula <prymula76@outlook.com>
parents:
diff changeset
197
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prymula <prymula76@outlook.com>
parents:
diff changeset
198 // (Required as an alternative to the overloaded & operator).
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parents:
diff changeset
199 const ScopedPointer* getAddress() const noexcept { return this; }
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prymula <prymula76@outlook.com>
parents:
diff changeset
200
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prymula <prymula76@outlook.com>
parents:
diff changeset
201 #ifndef _MSC_VER // (MSVC can't deal with multiple copy constructors)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
202 /* The copy constructors are private to stop people accidentally copying a const ScopedPointer
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
203 (the compiler would let you do so by implicitly casting the source to its raw object pointer).
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prymula <prymula76@outlook.com>
parents:
diff changeset
204
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
205 A side effect of this is that in a compiler that doesn't support C++11, you may hit an
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
206 error when you write something like this:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
207
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
208 ScopedPointer<MyClass> m = new MyClass(); // Compile error: copy constructor is private.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
209
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prymula <prymula76@outlook.com>
parents:
diff changeset
210 Even though the compiler would normally ignore the assignment here, it can't do so when the
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
211 copy constructor is private. It's very easy to fix though - just write it like this:
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
212
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
213 ScopedPointer<MyClass> m (new MyClass()); // Compiles OK
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prymula <prymula76@outlook.com>
parents:
diff changeset
214
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
215 It's probably best to use the latter form when writing your object declarations anyway, as
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
216 this is a better representation of the code that you actually want the compiler to produce.
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prymula <prymula76@outlook.com>
parents:
diff changeset
217 */
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prymula <prymula76@outlook.com>
parents:
diff changeset
218 # ifdef DISTRHO_PROPER_CPP11_SUPPORT
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prymula <prymula76@outlook.com>
parents:
diff changeset
219 ScopedPointer(const ScopedPointer&) = delete;
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parents:
diff changeset
220 ScopedPointer& operator=(const ScopedPointer&) = delete;
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prymula <prymula76@outlook.com>
parents:
diff changeset
221 # else
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
222 ScopedPointer(const ScopedPointer&);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
223 ScopedPointer& operator=(const ScopedPointer&);
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prymula <prymula76@outlook.com>
parents:
diff changeset
224 # endif
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
225 #endif
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
226 };
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
227
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
228 //==============================================================================
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
229 /** Compares a ScopedPointer with another pointer.
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parents:
diff changeset
230 This can be handy for checking whether this is a null pointer.
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prymula <prymula76@outlook.com>
parents:
diff changeset
231 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
232 template<class ObjectType>
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
233 bool operator==(const ScopedPointer<ObjectType>& pointer1, ObjectType* const pointer2) noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
234 {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
235 return static_cast<ObjectType*>(pointer1) == pointer2;
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prymula <prymula76@outlook.com>
parents:
diff changeset
236 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
237
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
238 /** Compares a ScopedPointer with another pointer.
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prymula <prymula76@outlook.com>
parents:
diff changeset
239 This can be handy for checking whether this is a null pointer.
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
240 */
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
241 template<class ObjectType>
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
242 bool operator!=(const ScopedPointer<ObjectType>& pointer1, ObjectType* const pointer2) noexcept
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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243 {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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244 return static_cast<ObjectType*>(pointer1) != pointer2;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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245 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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246
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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247 // -----------------------------------------------------------------------
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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248
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prymula <prymula76@outlook.com>
parents:
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249 END_NAMESPACE_DISTRHO
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prymula <prymula76@outlook.com>
parents:
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250
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
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251 #endif // DISTRHO_SCOPED_POINTER_HPP_INCLUDED