trait Pure extends AnyRef

Reporters should implement the Constant interface (which extends Pure) if they are truly constant, i.e., _constdouble, _conststring.

They should implement the Pure interface if they are constant-preserving (i.e. the result is constant when all of their args are constant.)

The main point here is that this distinction allows us to compute some values at compile-time, rather than run-time.

Specifically, PureConstantOptimizer looks for reporters that are entirely pure. A reporter is "entirely pure" if it implements Pure, and all of it's children are "entirely pure". Entirely pure reporters get evaluated at compile time, and replaced with the appropriate constant reporter.

"Pure" reporters *must* not depend on "context", "workspace", "world", etc.

Source
Pure.scala
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