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RefBase subclasses can now decide how they want to be destroyed. 

This adds a destroy() virtual on RefBase which
sublasses can implement. destroy() is called
in lieu of the destructor whenthe last strong
ref goes away.
This commit is contained in:
Mathias Agopian 2011-05-19 18:03:31 -07:00
parent 18c7868cec
commit 20aeb1caa4
2 changed files with 13 additions and 3 deletions
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10
include/utils/RefBase.h
View File

@ -51,7 +51,6 @@ inline bool operator _op_ (const U* o) const { \
}
// ---------------------------------------------------------------------------
class ReferenceMover;
class ReferenceConverterBase {
public:
@ -120,7 +119,14 @@ public:
protected:
RefBase();
virtual ~RefBase();
// called when the last reference goes away. this is responsible for
// calling the destructor. The default implementation just does
// "delete this;".
// Make sure to never acquire a strong reference from this function. The
// same restrictions than for destructors apply.
virtual void destroy() const;
//! Flags for extendObjectLifetime()
enum {
OBJECT_LIFETIME_WEAK = 0x0001,

6
libs/utils/RefBase.cpp
View File

@ -345,6 +345,10 @@ void RefBase::incStrong(const void* id) const
const_cast<RefBase*>(this)->onFirstRef();
}
void RefBase::destroy() const {
delete this;
}
void RefBase::decStrong(const void* id) const
{
weakref_impl* const refs = mRefs;
@ -357,7 +361,7 @@ void RefBase::decStrong(const void* id) const
if (c == 1) {
const_cast<RefBase*>(this)->onLastStrongRef(id);
if ((refs->mFlags&OBJECT_LIFETIME_WEAK) != OBJECT_LIFETIME_WEAK) {
delete this;
destroy();
}
}
refs->decWeak(id);