Compiler does optimize it away. But it should compile it first to validate correctness of the code. Btw on "g++ (GCC) 3.4.6 20060404 (Red Hat 3.4.6-3)" I do not see those warnings. I also prefer to use: if(n==2) if(n==3)//without else. -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Hicham Mouline Sent: Tuesday, March 18, 2008 2:56 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] template int argument That's what I thought... What forbids the compiler from optimizing away the test on n value, during the template instantiation process? Thanks, -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Steven Watanabe Sent: 18 March 2008 18:47 To: boost-users@lists.boost.org Subject: Re: [Boost-users] template int argument AMDG Hicham Mouline wrote:

hi,

I have a template function { .... double array[n];

if (n==2) binomial code else if (n==3) trinomial code (array[0] array[1] array[2]) else ....

compiler tries to compile the "trinomial code" code even when the template

is instantiated with n=2, and that gives warnings because of array[2]

Is there a way to make the compiler ignore the non-binomial code ? rds,

You'll have to split it out into a separate function and use template specialization/overload resolution. template<int n> void do_n_specific_code(double (&array)[n]); template void f() { double array[n]; do_n_specific_code(array); } In Christ, Steven Watanabe _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------