Module vs. package

An implementation of the solarray procedure by a package is given in Chapter 'Packages' of the Mosel User Guide. An advantage of this package version clearly is a less technical implementation that focusses on the required functionality without any programming overhead such as the various data structures used for communication or the module initialization function. However, whilst at the C level we simply check that the two arguments have the same index sets without having to include any more precise information about the nature of these indices, within the Mosel language the type and number of the array index sets must be known. As a consequence we have to provide a separate implementation for every case that we wish to use (one-, two-, three-,...,n-dimensional arrays indexed by integers, strings,...), restricting the functionality defined by the package to those versions that are explicitly defined.