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A Java ‘pragma foreign_type’ declaration has the form:

:- pragma foreign_type("Java", MercuryTypeName, "JavaType").

The JavaType can be any accessible Java type.

The effect of this declaration is that Mercury values of type MercuryTypeName will be passed to and from Java foreign_procs as having type JavaType.

Furthermore, any Mercury procedure exported with ‘pragma foreign_export’ will use JavaType as the type for any parameters whose Mercury type is MercuryTypeName.