Box2D: /build/box2d/src/box2d-2.4.2/include/box2d/b2_stack_allocator.h Source File

| Box2D 2.4.1 A 2D physics engine for games

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b2_stack_allocator.h
1// MIT License
2
3// Copyright (c) 2019 Erin Catto
4
5// Permission is hereby granted, free of charge, to any person obtaining a copy
6// of this software and associated documentation files (the "Software"), to deal
7// in the Software without restriction, including without limitation the rights
8// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9// copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11
12// The above copyright notice and this permission notice shall be included in all
13// copies or substantial portions of the Software.
14
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21// SOFTWARE.
22
23#ifndef B2_STACK_ALLOCATOR_H
24#define B2_STACK_ALLOCATOR_H
25
26#include "b2_api.h"
27#include "b2_settings.h"
28
29const int32 b2_stackSize = 100 * 1024; // 100k
30const int32 b2_maxStackEntries = 32;
31
32 struct B2_API b2StackEntry
33{
34 char* data;
35 int32 size;
36 bool usedMalloc;
37};
38
39// This is a stack allocator used for fast per step allocations.
40// You must nest allocate/free pairs. The code will assert
41// if you try to interleave multiple allocate/free pairs.
42 class B2_API b2StackAllocator
43{
44public:
45 b2StackAllocator();
46 ~b2StackAllocator();
47
48 void* Allocate(int32 size);
49 void Free(void* p);
50
51 int32 GetMaxAllocation() const;
52
53private:
54
55 char m_data[b2_stackSize];
56 int32 m_index;
57
58 int32 m_allocation;
59 int32 m_maxAllocation;
60
61 b2StackEntry m_entries[b2_maxStackEntries];
62 int32 m_entryCount;
63};
64
65#endif
b2_settings.h
b2StackAllocator
Definition b2_stack_allocator.h:43
b2StackEntry
Definition b2_stack_allocator.h:33