Andre Poenitz wrote:
> What is that?
It is a safe way of holding a pointer whose memory is allocated elsewhere:
> [Especially: Why is it used in FormulaBase, Angus?]
class LyXView {
/** return the current buffer view
Returned as a shared_ptr so that anything wanting to cache the
buffer view can do so safely using a boost::weak_ptr.
*/
boost::shared_ptr<BufferView> const & view() const;
protected:
/// view of a buffer. Eventually there will be several.
boost::shared_ptr<BufferView> bufferview_;
};
If formulabase stores its cached BufferView in a boost::weak_ptr, then
destruction of LyXView::bufferview_ will cause the FormulaBase's
boost::weak_ptr<BufferView> view_ to return 0 in a call
BufferView * cachedbv = view_.get();
if (cachedbv == 0)
// do nothing. the parent pointer has been destroyed.
--
Angus
