This unit implements the expression evaluator. The component TRpEvaluator, with the help of a parser (rpparser.pas), evaluates expressions, and returns result value as a TRpValue type (Variant)
| Name | Base class | Description |
| TRpCustomEvaluator | TComponent | Base class, without published properties, but implementing all the functions |
| TRpEvaluator | TRpCustomEvaluator | Publish properties, this component is installable in the component paletter, you can link a TRpAlias to allow the use of database fields in expressions |