stream.sa


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-- Author: Benedict A. Gomes <gomes@samosa.ICSI.Berkeley.EDU>


abstract class $OSTREAM

abstract class $OSTREAM is -- A general output stream. A first stab at streams. This -- abstraction is already useful for routines that might use a file -- or a string ( a common choice is whether a routine will write to -- stdout or to a string which may then be printed to a file). -- -- Usage: -- write_to_stream(o: $OUTSTREAM) is -- o + "this is a test"; -- end; -- Which can be invoked using: -- write_to_stream(FILE::stdout); -- or -- s: STR_STREAM := #; -- write_to_stream(s); -- write_to_stream(s); -- s.str then would have two copies of "this is a test" in it. plus(s: $STR); -- Append the string "s" to the stream plus(s: $STR): SAME; -- Append the string "s" to the stream and return self end; -- class $OUTSTREAM