This vector implementation does is optimized for the case of having only a small number of elements, which are stored directly on the vector object rather than being allocated from the heap. If the capacity exceeds this small number, then a heap allocation is done.
This should improve performance in a couple of cases where vectors typically store 1 element and rarely more than that.
Currently, the WeakPointerTo comparison operators compare the raw pointers, but this is not useful as it may cause a false equality if one weak pointer in the comparison is expired and points to memory that has since been reused.
Instead, we can define a comparison based on the control block pointer, which exists since the new weak pointer implementation in 0bb81a43c9. This is implemented in the owner_before method, matching C++11 std::weak_ptr semantics.
I would now recommend deprecating most comparison operators of WeakPointerTo or redefining them to make more sense, ie. comparing equal if they (once) referred to the same object and not if they simply point to the same memory address. This has not yet been done, though code that uses the comparison operators has been fixed in this commit.
Overloads of std::owner_less have been provided for creating a map or set with Weak(Const)PointerTo keys.
This was a regression in 0bb81a43c9 which was not keeping an edge case in mind if a weak pointer is locked during object destruction. This issue was fixed by 525a05ea2b1d00a1db901f883f1755943aeff33c, but that is not enough since it causes CharacterJointEffect::get_character() to return null now, so we need a separate method to check if a CharacterJointEffect belongs to a given character. This is more efficient, too.
Fixes#330
To access a WeakPointerTo in a thread-safe way, use something like this:
if (auto ptr = weak_ptr.lock()) {
..use ptr as regular PointerTo
}
The new implementation no longer needs a reference to be stored to all weak pointers on the WeakReferenceList; a mere count of weak pointers is sufficient. Therefore, callbacks theoretically no longer require a WeakPointerTo to be constructed.
The WeakPointerTo class is not actually atomic; it could be made so, but I don't believe it's worth it at this time.
This is designed to sanity-check the buildsystem, ensuring that the
expected BUILDING_ macros are defined at the expected time. It
also helps catch cases where the wrong BUILDING_/EXPCL_ macros
are used.
The rationale is that CharacterJoint should contain all of the joint
state information, and JointVertexTransform should be pretty much devoid
of state so that we don't have to worry about synchronizing it.
JointVertexTransform::_matrix was just a cached/precomputed matrix
that transforms from original vertex positions to animated vertex
positions, so moving it to CharacterJoint doesn't change any engine
functionality.
This also removes the useless lock on recomputing that matrix. It was
useless because it was computing from shared state in CharacterJoint
that wasn't properly synchronized, but this would have to be fixed by
making CharacterJoint pipeline-cycled - a lock won't do.
rdb
Sam Edwards
tobspr