1 // Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 // THE SOFTWARE.
20 
21 #pragma once
22 
23 #include "CPlusPlusForwardDeclarations.h"
24 #include <new>
25 
26 namespace CPlusPlus {
27 
28 class MemoryPool;
29 
30 class CPLUSPLUS_EXPORT MemoryPool
31 {
32     MemoryPool(const MemoryPool &other);
33     void operator =(const MemoryPool &other);
34 
35 public:
36     MemoryPool();
37     ~MemoryPool();
38 
39     void reset();
40 
allocate(size_t size)41     inline void *allocate(size_t size)
42     {
43         size = (size + 7) & ~7;
44         if (_ptr && (_ptr + size < _end)) {
45             void *addr = _ptr;
46             _ptr += size;
47             return addr;
48         }
49         return allocate_helper(size);
50     }
51 
52 private:
53     void *allocate_helper(size_t size);
54 
55 private:
56     char **_blocks;
57     int _allocatedBlocks;
58     int _blockCount;
59     char *_ptr;
60     char *_end;
61 
62     enum
63     {
64         BLOCK_SIZE = 8 * 1024,
65         DEFAULT_BLOCK_COUNT = 8
66     };
67 };
68 
69 class CPLUSPLUS_EXPORT Managed
70 {
71     Managed(const Managed &other);
72     void operator = (const Managed &other);
73 
74 public:
75     Managed();
76     virtual ~Managed();
77 
78     void *operator new(size_t size, MemoryPool *pool);
79     void operator delete(void *);
80     void operator delete(void *, MemoryPool *);
81 };
82 
83 } // namespace CPlusPlus
84