Abstract
We present a complete set of Fortran 90 modules that can be used to write
very compact, efficient, and high level QCD programs. The modules define fields
(gauge, fermi, generators, complex, and real fields) as abstract data types,
together with simpler objects such as SU(3) matrices or color vectors.
Overloaded operators are then defined to perform all possible operations
between the fields that may be required in a QCD simulation. QCD programs
written using these modules need not have cumbersome subroutines and can be
very simple and transparent. This is illustrated with two simple example
programs.
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