axmol/thirdparty/box2d-optimized/include/box2d/b2_tracked_block.h

93 lines
2.7 KiB
C++

/*
* Copyright (c) 2014 Google, Inc.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifndef B2_TRACKED_BLOCK_H
#define B2_TRACKED_BLOCK_H
#include "b2_intrusive_list.h"
#include "b2_settings.h"
/// Alignment (in bytes) of user memory associated with b2TrackedBlock.
const int32 b2_mallocAlignment = 32;
/// Allocated block of memory that can be tracked in a b2IntrusiveList.
class b2TrackedBlock : public b2TypedIntrusiveListNode<b2TrackedBlock>
{
private:
// Initialize this block with a reference to "this".
b2TrackedBlock();
// Remove the block from the list.
~b2TrackedBlock() { }
public:
/// Get the allocated memory associated with this block.
void* GetMemory() const;
private:
// Padding required to align the pointer to user memory in the block
// to b2_mallocAlignment.
uint8 m_padding[b2_mallocAlignment + sizeof(b2TrackedBlock**)];
public:
/// Allocate a b2TrackedBlock returning a pointer to memory of size
/// bytes that can be used by the caller.
static void* Allocate(uint32 size);
/// Get a b2TrackedBlock from a pointer to memory returned by
/// b2TrackedBlock::Allocate().
static b2TrackedBlock* GetFromMemory(void *memory);
/// Free a block of memory returned by b2TrackedBlock::Allocate()
static void Free(void *memory);
/// Free a b2TrackedBlock.
static void Free(b2TrackedBlock *block);
};
/// Allocator of blocks which are tracked in a list.
class b2TrackedBlockAllocator
{
public:
/// Initialize.
b2TrackedBlockAllocator() {}
/// Free all allocated blocks.
~b2TrackedBlockAllocator()
{
FreeAll();
}
/// Allocate a block of size bytes using b2TrackedBlock::Allocate().
void* Allocate(uint32 size);
/// Free a block returned by Allocate().
void Free(void *memory);
/// Free all allocated blocks.
void FreeAll();
// Get the list of allocated blocks.
const b2TypedIntrusiveListNode<b2TrackedBlock>& GetList() const
{
return m_blocks;
}
private:
b2TypedIntrusiveListNode<b2TrackedBlock> m_blocks;
};
#endif // B2_TRACKED_BLOCK_H