Re: Import a type from C

["Frank J. Lhota" <NOSPAM.lhota.adarose@verizon.net>]

A C struct is basically the equivalent to an Ada record type, so if the C
type is declared as

    typedef struct tag_my_data {
        ...
        } my_data;


I would declare an Ada record type for that C struct, e.g..

    type My_Data is
        record
            ...
        end record;
    pragma Convention( C, My_Data );

The Convention pragma can be used to specify that this record type should be
laid out in the same way that a C compiler would. Also, check out the
Interfaces.C package. It defines types that correspond to C scalar types.
You should use this to declare the scalar components in the Ada equivalent
of the C struct.

If the type contains a C union, look up the Unchecked_Union pragma to see
how to write an equivalent Ada record type.