TConstObjectSharedAccess

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Syntax

template<typename ObjectType>  
class TConstObjectSharedAccess  
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template<typename ObjectType> class TConstObjectSharedAccess

Remarks

TConstObjectSharedAccess provides a way for the owner of some object (eg a Mesh) to share read-only access to that object with background threads.

This avoids the obvious alternative, using TSharedPtr, which tends to result in some bad patterns (in particular calling code that /doesn't/ have a shared pointer to the object, now has to make a copy, or also convert all related code to use a shared pointer).

Currently TConstObjectSharedAccess's template ObjectType must be default constructible. This allows the background threads to still access an instance of ObjectType even if the owner thread/code decides to revoke access. In that case, TConstObjectSharedAccess provides an "empty" ObjectType instead. (the background processing code must handle this case).

TConstObjectSharedAccess can be constructed with either a raw pointer to ObjectType, or a TSharedPtr. In the raw pointer case, the creator is responsible for destruction.

The standard usage pattern is:

[Owner thread] T* ObjectPtr = (...); TSharedPtr> SharedAccess = MakeShared>(ObjectPtr); pass_to_background_thread(SharedAccess);

[Background thread] SharedAccess->AccessSharedObject( const ObjectType& Object { do_my_stuff(Object); } );

[Owner thread (later)] SharedAccess->ReleaseSharedObject();

Note that a TSharedPtr does not strictly need to be used. However this allows the Owner thread to destruct the Object, and/or terminate, and the background thread can still safely access a shared ObjectType (now empty).

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