diff options
Diffstat (limited to 'src/corelib/tools/qcontiguouscache.cpp')
| -rw-r--r-- | src/corelib/tools/qcontiguouscache.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/corelib/tools/qcontiguouscache.cpp b/src/corelib/tools/qcontiguouscache.cpp index 3e325bec59..40edb0fa58 100644 --- a/src/corelib/tools/qcontiguouscache.cpp +++ b/src/corelib/tools/qcontiguouscache.cpp @@ -80,8 +80,15 @@ void QContiguousCacheData::freeData(QContiguousCacheData *data) of matching how user interface views most commonly request data, as a set of rows localized around the current scrolled position. This restriction allows the cache to consume less memory and processor - cycles than QCache. The QContiguousCache class also can provide - an upper bound on memory usage via setCapacity(). + cycles than QCache. + + QContiguousCache operates on a fixed capacity, set with setCapacity() or + passed as a parameter to the constructor. This capacity is the upper bound + on memory usage by the cache itself, not including the memory allocated by + the elements themselves. Note that a cache with a capacity of zero (the + default) means no items will be stored: the insert(), append() and + prepend() operations will effectively be no-ops. Therefore, it's important + to set the capacity to a reasonable value before adding items to the cache. The simplest way of using a contiguous cache is to use the append() and prepend(). |