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
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