-------- Original Message -------- Subject: Re: C++ interface and mpz_addmul Date: Sat, 29 Jun 2002 07:57:06 +1000 From: Kevin Ryde user42@zip.com.au To: gmp@swox.com, ppl-devel@cs.unipr.it CC: Gerardo.Ballabio@unimib.it References: 3D1CD64E.4030508@cs.unipr.it
Roberto Bagnara bagnara@cs.unipr.it writes:
it seems that C++ statements of the form
a += b*cfor a, b and c of type mpz_class, are not translated by the C++ interface into an invocation of mpz_addmul.
Alas you're right. mpz_addmul is only used for "mpq += mpz" at the moment. (Hmm. Should use mpz_addmul_ui for "mpq += ulong" too I guess.)
The reason I am asking is twofold: on the one hand, expressions like that are quite common in several applications and they usually occur in critical computation paths (e.g., applications computing zillions of scalar products);
You can call mpz_addmul directly with mpz_class::get_mpz_t if you want. Not terribly pretty, but it'll work right now.
on the other hand, the template machinery used to implement the C++ interface of GMP would seem powerful enough to do the right thing.
I wonder if the templating can cope with two operators like that.
Am I missing something? If not, are there any plans to enhance the C++ interface so as to capture this case?
Gerardo?
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