Allocate/free support in QArrayData

Centralizing QArrayData memory management decisions in one place will
allow us to be smarter in how we allocate header and data.

At the moment, these are allocated as a single block. In the future we
may decide to allocate them separately for "large" data or specific
alignment requirements.

For users of QArrayData this remains transparent and not part of the
ABI. The offset field in QArrayDataHeader enables this.

This also hard-wires allocation of empty arrays to return shared_empty.
Allocating detached headers (e.g., to support fromRawData) will thus
require explicit support.

Change-Id: Icac5a1f51ee7e468c76b4493d29debc18780e5dc
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/corelib/tools/qarraydata.h b/src/corelib/tools/qarraydata.h
index 0b6949fe48..684f00870d 100644
--- a/src/corelib/tools/qarraydata.h
+++ b/src/corelib/tools/qarraydata.h
@@ -73,6 +73,11 @@ struct Q_CORE_EXPORT QArrayData
         return reinterpret_cast<const char *>(this) + offset;
     }
 
+    static QArrayData *allocate(size_t objectSize, size_t alignment,
+            size_t capacity, bool reserve) Q_REQUIRED_RESULT;
+    static void deallocate(QArrayData *data, size_t objectSize,
+            size_t alignment);
+
     static const QArrayData shared_null;
     static const QArrayData shared_empty;
 };