Clone For Thread Safe Methods

[mariuszgromada]

Methods for cloning parser objects to allow them to be run independently and safely by different threads.
#203

[mariuszgromada]

Creates a completely independent 1-1 clone that can be safely used by a separate thread. If the cloned element contains references to other elements (e.g. arguments, functions, constants), then they will also be cloned and the newly created element will contain references to the corresponding clones. Important - the API allows you to extract all these clones.

Expression.cloneForThreadSafe()
Function.cloneForThreadSafe()
Argument.cloneForThreadSafe()
RecursiveArgument.cloneForThreadSafe()
Constant.cloneForThreadSafe()