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PrimitiveTransform
      A PrimitiveTransform is a class type that
      has a nested class template called
      impl<> that takes
      three template parameters representing an expression
      type, a state type and a data type. Specializations
      of the nested impl template are ternary monomorphic
      function objects that accept expression, state, and
      data parameters. A PrimitiveTransform is also a
      PolymorphicFunctionObject
      implemented in terms of the nested
      impl<> template.
    
result_type
typename Fn::template impl<Expr, State, Data>::result_type
The return type of the overloaded function call operator.
fnexprstatedata| Name | Expression | Type | Semantics | 
|---|---|---|---|
| Polymorphic Function Call 1 | fn(expr) | result_type | Applies the transform. | 
| Polymorphic Function Call 2 | fn(expr, state) | result_type | Applies the transform. | 
| Polymorphic Function Call 3 | fn(expr, state, data) | result_type | Applies the transform. | 
| Monomorphic Function Call | typename Fn::template impl< Expr, State, Data >()(expr, state, data) | result_type | Applies the transform. |