VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Platform/SharedPtr.h
blob: 64e2909adcc7d4c7d702648d3edc0dddab2863c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*
 Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.

 Governed by the TrueCrypt License 3.0 the full text of which is contained in
 the file License.txt included in TrueCrypt binary and source code distribution
 packages.
*/

#ifndef TC_HEADER_Platform_SharedPtr
#define TC_HEADER_Platform_SharedPtr

#include <stdexcept>
#include "SharedVal.h"

#ifdef nullptr

namespace VeraCrypt
{
	template <class T>
	class SharedPtr 
	{
	public:
		explicit SharedPtr ()
			: Pointer (nullptr), UseCount (nullptr) { }

		explicit SharedPtr (T *pointer)
			: Pointer (pointer), UseCount (new SharedVal <uint64> (1)) { }

		SharedPtr (const SharedPtr &source)
		{
			CopyFrom (source);
		}

		~SharedPtr ()
		{
			Release();
		}

		SharedPtr &operator= (const SharedPtr &source)
		{
			if (&source == this)
				return *this;

			Release();
			CopyFrom (source);
			return *this;
		}

		bool operator == (const SharedPtr &other)
		{
			return get() == other.get();
		}

		bool operator != (const SharedPtr &other)
		{
			return get() != other.get();
		}

		T &operator* () const
		{
#ifdef DEBUG
			if (Pointer == nullptr)
				throw std::runtime_error (SRC_POS);
#endif
			return *Pointer;
		}

		T *operator-> () const
		{
#ifdef DEBUG
			if (Pointer == nullptr)
				throw std::runtime_error (SRC_POS);
#endif
			return Pointer;
		}

		operator bool () const
		{
			return Pointer != nullptr;
		}

		T *get () const
		{
			return Pointer;
		}

		void reset ()
		{
			Release();
		}

		void reset (T *pointer)
		{
			*this = SharedPtr (pointer);
		}

		uint64 use_count () const
		{
			if (!UseCount)
				return 0;

			return *UseCount;
		}

	protected:
		void CopyFrom (const SharedPtr &source)
		{
			Pointer = source.Pointer;
			UseCount = source.UseCount;
			
			if (UseCount)
				UseCount->Increment();
		}

		void Release ()
		{
			if (UseCount != nullptr)
			{
				if (UseCount->Decrement() == 0)
				{
					if (Pointer != nullptr)
						delete Pointer;
					delete UseCount;
				}

				Pointer = nullptr;
				UseCount = nullptr;
			}
		}

		T *Pointer;
		SharedVal <uint64> *UseCount;
	};

#ifdef shared_ptr
#undef shared_ptr
#endif
#define shared_ptr VeraCrypt::SharedPtr

#ifdef make_shared
#undef make_shared
#endif

	template <class T> shared_ptr <T> make_shared ()
	{
		return shared_ptr <T> (new T ());
	}

	template <class T, class A> shared_ptr <T> make_shared (const A &arg)
	{
		return shared_ptr <T> (new T (arg));
	}

#define make_shared VeraCrypt::make_shared

}

#endif // nullptr

#define make_shared_auto(typeName,instanceName) shared_ptr <typeName> instanceName (new typeName ())

#endif // TC_HEADER_Platform_SharedPtr