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<h4 class="subsection">8.2.2 Incorrect Remote Dispatching</h4>
<p>When a remote subprogram takes a class wide argument, there is a risk of
using an object of a derived type that will not be clean enough to be
transmitted. For example, given a type called Root_Type, if a remote
procedure takes a Root_Type’Class as an argument, the user can call it
with an instance of Derived_Type that is Root_Type enriched with a field
of a task type. This will lead to a non-communicable type to be
transmitted between partitions.
</p>
<p>To prevent this, paragraph E.4(18) of the Ada Reference Manual explains that
any actual type used as parameter for a remote call whose formal type is
a class wide type must be declared in the visible part of a Pure or
Remote_Types package. This property also holds for remote functions
returning class wide types. To summarize, the actual type used should
have been eligible for being declared where the root type has been
declared. If a ‘bad’ object is given to a remote subprogram,
<i>Program_Error</i> will be raised at the point of the call.
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