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Description

The fieldsExpression class is an intermediate class for handling field expression function objects (e.g. add, subtract etc.) whereinto more than one fields are input.

The class is not an executable function object itself, yet a provider for common entries to its derived function objects.

Usage

The optional-inherited entries provided by fieldsExpression to the derived function objects are as follows:

<userDefinedSubDictName1>
{
    // Mandatory and other optional entries
    ...

    // Optional (inherited) entries (runtime modifiable)
    fields            (<field1> <field2> ... <fieldN>);
    result            <fieldResult>;
}

where the entries mean:

Property Description Type Required Default
fields Names of the operand fields wordList yes -
result Names of the output fields wordList no <FO>(<f1>,…)

Further information

Source code:

API:

History: