PL/I has procedure parameters but not call by name. Algol 60 has call by name but not call by reference.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List <ASSEMBLER-LIST@listserv.uga.edu> on behalf of Paul Gilmartin <00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> Sent: Thursday, February 8, 2018 12:21 PM To: ASSEMBLER-LIST@listserv.uga.edu Subject: Re: Man or boy test (was: Fair comparison C vs HLASM) On 2018-02-08, at 08:33:37, Bernd Oppolzer wrote: > Am 08.02.2018 um 15:50 schrieb Martin Ward: >> >> >> http://secure-web.cisco.com/1BYQst4tMUhn0OQV9yNTQIFppybJ0w91dgsHZtHRZ5OFG6Jn7aOxSsU9PWIni4HyW0_5nVh8ZG20CX03I9-CEemCEbfFfvX2hj94e9K4OMYtvDf_f10ZgJrOMgpJ47JzGzwUie1fk2lT0JfNN-vLwXwOD257QnOeUAdmdaseSBIixhOXR4hToYn3d2AmQEfStBhSzKukmFQI0tys2gU9ZNYnl5NQAeCGPVja-FALuxbVms22hjzw3weIpjyN4iS_D7qbDDRxUUWUkUYCawxU5GVQrAXQ2VGCQkqPkZQYc18DyNXRwjBX1Oxp98pyV-uco8V1CPXxOc1COft5oePt9ZPN_vRhNS4d3RUSZAflwS78yJ2I_-u6rH_g_VX0rHENZQ1S7r6hY7caV5wJBZxnr0A/http%3A%2F%2Frosettacode.org%2Fwiki%2FMan_or_boy_test >> > I would like to thank you very much for posting this. > I never heard about this test before, but I am very fascinated by it, > and I will try it out in the next days on my New Stanford Pascal compiler, > as soon as I have time to do it (there is a Pascal version of the test > on the page you mentioned above). > I glanced very briefly at it. It depends on nested procedure declarations which C lacks (and call-by-name? which Pascal lacks). PL/I? I think nested procedures were an early manifestation of OO-think: a block is an object and procedures within it are methods. Languages such as C eschew nested procedures partly because a procedure descriptor must consist of two pointers rather than just one. I vaguely remember one compiler (but I think it was C) that did this with an extra indirection: a procedure reference actually pointed to a structure containing two pointers, one for the entry point and the other for the stack frame. Broke a lot of things, especially expectation of portability. -- gil
