Parameters

Components can carry configuration parameters. These allow us to make component behaviors configurable and facilitate reuse. When defining a component type, the definition of configuration parameters, wrapped in parentheses, directly follows the name of the component. Multiple parameters are separated by commas. One can also define default values for parameters that then do not need to be bound during instantiation. Note, however, that once a parameter has a default value, all following parameters must have default values, too.

Example:

component LinearScalar(double factor, double offset = 0.0) {
  port in double baseValue,
       out double scaledValue;

  compute {
    scaledValue = factor * baseValue + offset;
  }
}

Instantiation of components with configuration parameters

When components with parameters are used during decomposition, values have to be assigned to these. These values can be any expression and can contain parameters of the enclosing component, too.

component MeasureNet {
  LinearScalar scaleAndAdd(3.0, 10);
  LinearScalar justScale(2.0);  // justScale's offset is implicitly assigned 0.0, the default value

  // The rest of the component is omitted here.
}