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-rw-r--r--src/lib/web/json/json_batchallocator.h176
1 files changed, 87 insertions, 89 deletions
diff --git a/src/lib/web/json/json_batchallocator.h b/src/lib/web/json/json_batchallocator.h
index 173e2ed2570..0093b8cc413 100644
--- a/src/lib/web/json/json_batchallocator.h
+++ b/src/lib/web/json/json_batchallocator.h
@@ -12,7 +12,6 @@
# ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION
namespace Json {
-
/* Fast memory allocator.
*
* This memory allocator allocates memory for a batch of object (specified by
@@ -21,104 +20,104 @@ namespace Json {
* It does not allow the destruction of a single object. All the allocated objects
* can be destroyed at once. The memory can be either released or reused for future
* allocation.
- *
+ *
* The in-place new operator must be used to construct the object using the pointer
* returned by allocate.
*/
template<typename AllocatedType
- ,const unsigned int objectPerAllocation>
+ ,const unsigned int objectPerAllocation>
class BatchAllocator
{
public:
- typedef AllocatedType Type;
+ typedef AllocatedType Type;
- BatchAllocator( unsigned int objectsPerPage = 255 )
- : freeHead_( 0 )
- , objectsPerPage_( objectsPerPage )
- {
+ BatchAllocator( unsigned int objectsPerPage = 255 )
+ : freeHead_( 0 )
+ , objectsPerPage_( objectsPerPage )
+ {
// printf( "Size: %d => %s\n", sizeof(AllocatedType), typeid(AllocatedType).name() );
- assert( sizeof(AllocatedType) * objectPerAllocation >= sizeof(AllocatedType *) ); // We must be able to store a slist in the object free space.
- assert( objectsPerPage >= 16 );
- batches_ = allocateBatch( 0 ); // allocated a dummy page
- currentBatch_ = batches_;
- }
-
- ~BatchAllocator()
- {
- for ( BatchInfo *batch = batches_; batch; )
- {
- BatchInfo *nextBatch = batch->next_;
- free( batch );
- batch = nextBatch;
- }
- }
-
- /// allocate space for an array of objectPerAllocation object.
- /// @warning it is the responsability of the caller to call objects constructors.
- AllocatedType *allocate()
- {
- if ( freeHead_ ) // returns node from free list.
- {
- AllocatedType *object = freeHead_;
- freeHead_ = *(AllocatedType **)object;
- return object;
- }
- if ( currentBatch_->used_ == currentBatch_->end_ )
- {
- currentBatch_ = currentBatch_->next_;
- while ( currentBatch_ && currentBatch_->used_ == currentBatch_->end_ )
- currentBatch_ = currentBatch_->next_;
-
- if ( !currentBatch_ ) // no free batch found, allocate a new one
- {
- currentBatch_ = allocateBatch( objectsPerPage_ );
- currentBatch_->next_ = batches_; // insert at the head of the list
- batches_ = currentBatch_;
- }
- }
- AllocatedType *allocated = currentBatch_->used_;
- currentBatch_->used_ += objectPerAllocation;
- return allocated;
- }
-
- /// Release the object.
- /// @warning it is the responsability of the caller to actually destruct the object.
- void release( AllocatedType *object )
- {
- assert( object != 0 );
- *(AllocatedType **)object = freeHead_;
- freeHead_ = object;
- }
+ assert( sizeof(AllocatedType) * objectPerAllocation >= sizeof(AllocatedType *) ); // We must be able to store a slist in the object free space.
+ assert( objectsPerPage >= 16 );
+ batches_ = allocateBatch( 0 ); // allocated a dummy page
+ currentBatch_ = batches_;
+ }
+
+ ~BatchAllocator()
+ {
+ for ( BatchInfo *batch = batches_; batch; )
+ {
+ BatchInfo *nextBatch = batch->next_;
+ free( batch );
+ batch = nextBatch;
+ }
+ }
+
+ /// allocate space for an array of objectPerAllocation object.
+ /// @warning it is the responsability of the caller to call objects constructors.
+ AllocatedType *allocate()
+ {
+ if ( freeHead_ ) // returns node from free list.
+ {
+ AllocatedType *object = freeHead_;
+ freeHead_ = *(AllocatedType **)object;
+ return object;
+ }
+ if ( currentBatch_->used_ == currentBatch_->end_ )
+ {
+ currentBatch_ = currentBatch_->next_;
+ while ( currentBatch_ && currentBatch_->used_ == currentBatch_->end_ )
+ currentBatch_ = currentBatch_->next_;
+
+ if ( !currentBatch_ ) // no free batch found, allocate a new one
+ {
+ currentBatch_ = allocateBatch( objectsPerPage_ );
+ currentBatch_->next_ = batches_; // insert at the head of the list
+ batches_ = currentBatch_;
+ }
+ }
+ AllocatedType *allocated = currentBatch_->used_;
+ currentBatch_->used_ += objectPerAllocation;
+ return allocated;
+ }
+
+ /// Release the object.
+ /// @warning it is the responsability of the caller to actually destruct the object.
+ void release( AllocatedType *object )
+ {
+ assert( object != 0 );
+ *(AllocatedType **)object = freeHead_;
+ freeHead_ = object;
+ }
private:
- struct BatchInfo
- {
- BatchInfo *next_;
- AllocatedType *used_;
- AllocatedType *end_;
- AllocatedType buffer_[objectPerAllocation];
- };
-
- // disabled copy constructor and assignement operator.
- BatchAllocator( const BatchAllocator & );
- void operator =( const BatchAllocator &);
-
- static BatchInfo *allocateBatch( unsigned int objectsPerPage )
- {
- const unsigned int mallocSize = sizeof(BatchInfo) - sizeof(AllocatedType)* objectPerAllocation
- + sizeof(AllocatedType) * objectPerAllocation * objectsPerPage;
- BatchInfo *batch = static_cast<BatchInfo*>( malloc( mallocSize ) );
- batch->next_ = 0;
- batch->used_ = batch->buffer_;
- batch->end_ = batch->buffer_ + objectsPerPage;
- return batch;
- }
-
- BatchInfo *batches_;
- BatchInfo *currentBatch_;
- /// Head of a single linked list within the allocated space of freeed object
- AllocatedType *freeHead_;
- unsigned int objectsPerPage_;
+ struct BatchInfo
+ {
+ BatchInfo *next_;
+ AllocatedType *used_;
+ AllocatedType *end_;
+ AllocatedType buffer_[objectPerAllocation];
+ };
+
+ // disabled copy constructor and assignement operator.
+ BatchAllocator( const BatchAllocator & );
+ void operator =( const BatchAllocator &);
+
+ static BatchInfo *allocateBatch( unsigned int objectsPerPage )
+ {
+ const unsigned int mallocSize = sizeof(BatchInfo) - sizeof(AllocatedType)* objectPerAllocation
+ + sizeof(AllocatedType) * objectPerAllocation * objectsPerPage;
+ BatchInfo *batch = static_cast<BatchInfo*>( malloc( mallocSize ) );
+ batch->next_ = 0;
+ batch->used_ = batch->buffer_;
+ batch->end_ = batch->buffer_ + objectsPerPage;
+ return batch;
+ }
+
+ BatchInfo *batches_;
+ BatchInfo *currentBatch_;
+ /// Head of a single linked list within the allocated space of freeed object
+ AllocatedType *freeHead_;
+ unsigned int objectsPerPage_;
};
@@ -127,4 +126,3 @@ private:
# endif // ifndef JSONCPP_DOC_INCLUDE_IMPLEMENTATION
#endif // JSONCPP_BATCHALLOCATOR_H_INCLUDED
-