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-rw-r--r--indra/llcommon/llinstancetracker.h97
1 files changed, 61 insertions, 36 deletions
diff --git a/indra/llcommon/llinstancetracker.h b/indra/llcommon/llinstancetracker.h
index 34f2a5985a..27422e1266 100644
--- a/indra/llcommon/llinstancetracker.h
+++ b/indra/llcommon/llinstancetracker.h
@@ -104,22 +104,26 @@ public:
return LockStatic()->mMap.size();
}
- // snapshot of std::pair<const KEY, std::shared_ptr<T>> pairs
- class snapshot
+ // snapshot of std::pair<const KEY, std::shared_ptr<SUBCLASS>> pairs, for
+ // some SUBCLASS derived from T
+ template <typename SUBCLASS>
+ class snapshot_of
{
// It's very important that what we store in this snapshot are
// weak_ptrs, NOT shared_ptrs. That's how we discover whether any
// instance has been deleted during the lifespan of a snapshot.
typedef std::vector<std::pair<const KEY, weak_t>> VectorType;
- // Dereferencing our iterator produces a std::shared_ptr for each
- // instance that still exists. Since we store weak_ptrs, that involves
- // two chained transformations:
+ // Dereferencing the iterator we publish produces a
+ // std::shared_ptr<SUBCLASS> for each instance that still exists.
+ // Since we store weak_ptr<T>, that involves two chained
+ // transformations:
// - a transform_iterator to lock the weak_ptr and return a shared_ptr
- // - a filter_iterator to skip any shared_ptr that has become invalid.
+ // - a filter_iterator to skip any shared_ptr<T> that has become
+ // invalid or references any T instance that isn't SUBCLASS.
// It is very important that we filter lazily, that is, during
// traversal. Any one of our stored weak_ptrs might expire during
// traversal.
- typedef std::pair<const KEY, ptr_t> strong_pair;
+ typedef std::pair<const KEY, std::shared_ptr<SUBCLASS>> strong_pair;
// Note for future reference: nat has not yet had any luck (up to
// Boost 1.67) trying to use boost::transform_iterator with a hand-
// coded functor, only with actual functions. In my experience, an
@@ -127,7 +131,7 @@ public:
// result_type typedef. But this works.
static strong_pair strengthen(typename VectorType::value_type& pair)
{
- return { pair.first, pair.second.lock() };
+ return { pair.first, std::dynamic_pointer_cast<SUBCLASS>(pair.second.lock()) };
}
static bool dead_skipper(const strong_pair& pair)
{
@@ -135,7 +139,7 @@ public:
}
public:
- snapshot():
+ snapshot_of():
// populate our vector with a snapshot of (locked!) InstanceMap
// note, this assigns pair<KEY, shared_ptr> to pair<KEY, weak_ptr>
mData(mLock->mMap.begin(), mLock->mMap.end())
@@ -184,44 +188,51 @@ public:
#endif // LL_WINDOWS
VectorType mData;
};
+ using snapshot = snapshot_of<T>;
- // iterate over this for references to each instance
- class instance_snapshot: public snapshot
+ // iterate over this for references to each SUBCLASS instance
+ template <typename SUBCLASS>
+ class instance_snapshot_of: public snapshot_of<SUBCLASS>
{
private:
- static T& instance_getter(typename snapshot::iterator::reference pair)
+ using super = snapshot_of<SUBCLASS>;
+ static T& instance_getter(typename super::iterator::reference pair)
{
return *pair.second;
}
public:
typedef boost::transform_iterator<decltype(instance_getter)*,
- typename snapshot::iterator> iterator;
- iterator begin() { return iterator(snapshot::begin(), instance_getter); }
- iterator end() { return iterator(snapshot::end(), instance_getter); }
+ typename super::iterator> iterator;
+ iterator begin() { return iterator(super::begin(), instance_getter); }
+ iterator end() { return iterator(super::end(), instance_getter); }
void deleteAll()
{
- for (auto it(snapshot::begin()), end(snapshot::end()); it != end; ++it)
+ for (auto it(super::begin()), end(super::end()); it != end; ++it)
{
delete it->second.get();
}
}
- };
+ };
+ using instance_snapshot = instance_snapshot_of<T>;
// iterate over this for each key
- class key_snapshot: public snapshot
+ template <typename SUBCLASS>
+ class key_snapshot_of: public snapshot_of<SUBCLASS>
{
private:
- static KEY key_getter(typename snapshot::iterator::reference pair)
+ using super = snapshot_of<SUBCLASS>;
+ static KEY key_getter(typename super::iterator::reference pair)
{
return pair.first;
}
public:
typedef boost::transform_iterator<decltype(key_getter)*,
- typename snapshot::iterator> iterator;
- iterator begin() { return iterator(snapshot::begin(), key_getter); }
- iterator end() { return iterator(snapshot::end(), key_getter); }
+ typename super::iterator> iterator;
+ iterator begin() { return iterator(super::begin(), key_getter); }
+ iterator end() { return iterator(super::end(), key_getter); }
};
+ using key_snapshot = key_snapshot_of<T>;
static ptr_t getInstance(const KEY& k)
{
@@ -368,22 +379,25 @@ public:
return LockStatic()->mSet.size();
}
- // snapshot of std::shared_ptr<T> pointers
- class snapshot
+ // snapshot of std::shared_ptr<SUBCLASS> pointers
+ template <typename SUBCLASS>
+ class snapshot_of
{
// It's very important that what we store in this snapshot are
// weak_ptrs, NOT shared_ptrs. That's how we discover whether any
// instance has been deleted during the lifespan of a snapshot.
typedef std::vector<weak_t> VectorType;
- // Dereferencing our iterator produces a std::shared_ptr for each
- // instance that still exists. Since we store weak_ptrs, that involves
- // two chained transformations:
+ // Dereferencing the iterator we publish produces a
+ // std::shared_ptr<SUBCLASS> for each instance that still exists.
+ // Since we store weak_ptrs, that involves two chained
+ // transformations:
// - a transform_iterator to lock the weak_ptr and return a shared_ptr
- // - a filter_iterator to skip any shared_ptr that has become invalid.
- typedef std::shared_ptr<T> strong_ptr;
+ // - a filter_iterator to skip any shared_ptr that has become invalid
+ // or references any T instance that isn't SUBCLASS.
+ typedef std::shared_ptr<SUBCLASS> strong_ptr;
static strong_ptr strengthen(typename VectorType::value_type& ptr)
{
- return ptr.lock();
+ return std::dynamic_pointer_cast<SUBCLASS>(ptr.lock());
}
static bool dead_skipper(const strong_ptr& ptr)
{
@@ -391,7 +405,7 @@ public:
}
public:
- snapshot():
+ snapshot_of():
// populate our vector with a snapshot of (locked!) InstanceSet
// note, this assigns stored shared_ptrs to weak_ptrs for snapshot
mData(mLock->mSet.begin(), mLock->mSet.end())
@@ -437,22 +451,33 @@ public:
#endif // LL_WINDOWS
VectorType mData;
};
+ using snapshot = snapshot_of<T>;
// iterate over this for references to each instance
- struct instance_snapshot: public snapshot
+ template <typename SUBCLASS>
+ class instance_snapshot_of: public snapshot_of<SUBCLASS>
{
- typedef boost::indirect_iterator<typename snapshot::iterator> iterator;
- iterator begin() { return iterator(snapshot::begin()); }
- iterator end() { return iterator(snapshot::end()); }
+ private:
+ using super = snapshot_of<SUBCLASS>;
+
+ public:
+ typedef boost::indirect_iterator<typename super::iterator> iterator;
+ iterator begin() { return iterator(super::begin()); }
+ iterator end() { return iterator(super::end()); }
void deleteAll()
{
- for (auto it(snapshot::begin()), end(snapshot::end()); it != end; ++it)
+ for (auto it(super::begin()), end(super::end()); it != end; ++it)
{
delete it->get();
}
}
};
+ using instance_snapshot = instance_snapshot_of<T>;
+ // key_snapshot_of isn't really meaningful, but define it anyway to avoid
+ // requiring two different LLInstanceTrackerSubclass implementations.
+ template <typename SUBCLASS>
+ using key_snapshot_of = instance_snapshot_of<SUBCLASS>;
protected:
LLInstanceTracker()
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-02 22:33:39 +0000