Karim BELABAS on Sun, 4 Aug 2002 14:23:53 +0200 (MEST) |
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.gprc + version number |
Hi, I noticed that unrelated code rewrites [ filtre() and read_line_from_file() ] had enabled multiline constructs [ {}, \ and = ] in .gprc (with a few minor bugs which I ironed out). Since this looks useful, I documented it. Second, I added a preprocessor test against PARI version number (using Bill's patch introducing PARI_VERSION & friends) to the gprc capabilities. In short the following is now valid _in the gprc file_: #if VERSION > 2.2.3 { new_galois_format = 1; \\ default introduced in 2.2.4 read "new_script"; \\ syntax errors in older GP } [ this is all documented in the user's manual ] It would be relatively painful to backport, this so I won't do it, but at least it will be there from now on. A few remarks: 1) it would be preferable (and trivial to implement) to have standard cpp syntax (using pairs #if / #endif) but that would introduce yet another compatibility problem. 2) this could conceivably be useful under GP. Perhaps introducing the following command would be enough: require(str) = raise an error if GP's version number is strictly lower that str (which has the form "2.2.4", where the trailing components can be omitted). Comments ? Karim. -- Karim Belabas Tel: (+33) (0)1 69 15 57 48 Dép. de Mathematiques, Bat. 425 Fax: (+33) (0)1 69 15 60 19 Université Paris-Sud Email: Karim.Belabas@math.u-psud.fr F-91405 Orsay (France) http://www.math.u-psud.fr/~belabas/ -- PARI/GP Home Page: http://www.parigp-home.de/