getUsedFreeformFunctions method

@override Set<MathDefinitionFunctionFreeform> getUsedFreeformFunctions()

Get mentioned custom defined functions that are required to evaluate the expression

Searches the math tree for any MathFunctionFreeform instances and returns a set of their definitions.

Implementation

@override
Set<MathDefinitionFunctionFreeform> getUsedFreeformFunctions() {
  return {...x1.getUsedFreeformFunctions(), ...x2.getUsedFreeformFunctions()};
}