Module vs. package

Since Mosel 5 packages offer similar functionality as modules for the implementation of parameters. The parameter names and types are specified in the parameters block of the package:

 parameters
  "p1":real
  "p2":integer
  "p3":string
  "p4":boolean
 end-parameters

The access routines for the four parameter types have a fixed format, namely packagename∼get[r|i|s|b]param and packagename∼set[r|i|s|b]param. The access routines must be defined according to the parameter types implemented by a package as shown in the code extract below—the complete example can be found in the Chapter 'Packages' of the Mosel User Guide.

 declarations
  myp1: real     ! Entity for storing the current parameter value
 end-declarations

 myp1:=0,25      ! Set the default value for the parameter

! Get value of a real parameter
 public function parpkg~getrparam(p:string):real
  case p of
   "p1": returned:=myp1
  end-case
 end-function

 ! Set value for real parameters
 public procedure parpkg~setparam(p:string,v:real)
  case p of
   "p1": myp1:=v
  end-case
 end-procedure

A model using the package will access the package parameters via Mosel's standard getparam and setparam routines.