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tinyxml2::MemPoolT
Syntax
class MemPoolT : public MemPool
{
public:
MemPoolT() : _blockPtrs(), _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0) {}
~MemPoolT() {
MemPoolT< ITEM_SIZE >::Clear();
}
void Clear() {
while( !_blockPtrs.Empty()) {
Block* lastBlock = _blockPtrs.Pop();
delete lastBlock;
}
_root = 0;
_currentAllocs = 0;
_nAllocs = 0;
_maxAllocs = 0;
_nUntracked = 0;
}
virtual int ItemSize() const {
return ITEM_SIZE;
}
int CurrentAllocs() const {
return _currentAllocs;
}
virtual void* Alloc() {
if ( !_root ) {
Block* block = new Block();
_blockPtrs.Push( block );
Item* blockItems = block->items;
for( int i = 0; i < ITEMS_PER_BLOCK - 1; ++i ) {
blockItems[i].next = &(blockItems[i + 1]);
}
blockItems[ITEMS_PER_BLOCK - 1].next = 0;
_root = blockItems;
}
Item* const result = _root;
TIXMLASSERT( result != 0 );
_root = _root->next;
++_currentAllocs;
if ( _currentAllocs > _maxAllocs ) {
_maxAllocs = _currentAllocs;
}
++_nAllocs;
++_nUntracked;
return result;
}
virtual void Free( void* mem ) {
if ( !mem ) {
return;
}
--_currentAllocs;
Item* item = static_cast<Item*>( mem );
#ifdef TINYXML2_DEBUG
memset( item, 0xfe, sizeof( *item ) );
#endif
item->next = _root;
_root = item;
}
void Trace( const char* name ) {
printf( "Mempool %s watermark=%d [%dk] current=%d size=%d nAlloc=%d blocks=%d\n",
name, _maxAllocs, _maxAllocs * ITEM_SIZE / 1024, _currentAllocs,
ITEM_SIZE, _nAllocs, _blockPtrs.Size() );
}
void SetTracked() {
--_nUntracked;
}
int Untracked() const {
return _nUntracked;
}
enum { ITEMS_PER_BLOCK = (4 * 1024) / ITEM_SIZE };
private:
MemPoolT( const MemPoolT& );
void operator=( const MemPoolT& );
union Item {
Item* next;
char itemData[ITEM_SIZE];
};
struct Block {
Item items[ITEMS_PER_BLOCK];
};
DynArray< Block*, 10 > _blockPtrs;
Item* _root;
int _currentAllocs;
int _nAllocs;
int _maxAllocs;
int _nUntracked;
};