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AngouriMath.Core.FastExpression

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Classes within the AngouriMath.Core.FastExpression namespace

• Compiler

  Summary

  The stores the saved cache number if zero/positive,
  or the bitwise complement of the unsaved cache number if negative.

• Scratch

  Summary

  The working stack and the cache of repeated subexpressions, one set per thread
  rather than one per compiled expression.
  

  Remarks

  They used to be instance fields, which made a compiled expression unsafe to call
  from more than one thread at a time: two calls interleaved their pushes and pops
  and the second to finish found the stack in a state it did not put it in. Worse,
  the damage was permanent -- the count check throws before anything is popped, so
  one racing call left the leftovers behind and every later call failed too, on one
  thread or many. See https://github.com/asc-community/AngouriMath/issues/637.
  Per thread rather than per call so that calling a compiled expression still
  allocates nothing, which is the point of compiling it. Neither buffer carries
  anything from one call to the next: the stack is emptied on the way in, and the
  cache is only ever read at a slot the same call has already written.