From: "Brian Budge" <brian.budge@gmail.com>
To: gcc-help <gcc-help@gcc.gnu.org>
Subject: gcc linking and address of template function
Date: Fri, 05 May 2006 21:29:00 -0000 [thread overview]
Message-ID: <5b7094580605051429j3b4577c5o7d46dfb7f36fbc17@mail.gmail.com> (raw)
Hi all -
I'm attempting to use gsl (gnu scientific library) from my C++
program. gsl is a C program, and I need to pass function pointers to
gsl to make it do it's magic on my data.
The problem I'm having stems from the fact that I need my functions to
be template functions.
I can get everything to compile, but I can't get it to link.
The gist is like this:
template<class Stencil>
int ll_uv_f(const gsl_vector *x, void *params, gsl_vector *f){
LL_uv_data<Stencil> *lld = static_cast< LL_uv_data<Stencil>* >(params);
const real a = gsl_vector_get(x,0);
const real b = gsl_vector_get(x,1);
Vec v = lld->ll->eval(a, b) - lld->pt;
for(int i = 0; i < 2; ++i){
gsl_vector_set(f, i, v[i]);
}
return GSL_SUCCESS;
}
template<class Stencil>
int ll_uv_df(const gsl_vector *x, void *params, gsl_matrix *J){...}
template<class Stencil>
int ll_uv_fdf(const gsl_vector *x, void *params, gsl_vector *f,
gsl_matrix *J){...}
The calling function then contains the code:
LL_uv_data<BaseStencil> dat(Vec(u,v), this);
gsl_multiroot_function_fdf f = {ll_uv_f<BaseStencil>,
ll_uv_df<BaseStencil>,
ll_uv_fdf<BaseStencil>,
2, &dat};
I also explicitly instantiate the template functions for several
instances in a .cc file:
//explicit instantiation of template functions
template int ll_uv_fdf<CCStencil>(const gsl_vector *x, void *params,
gsl_vector *f, gsl_matrix *J);
template int ll_uv_fdf<BSStencil>(const gsl_vector *x, void *params,
gsl_vector *f, gsl_matrix *J);
.
.
.
template int ll_uv_df<CCStencil>(const gsl_vector *x, void *params,
gsl_matrix *J);
template int ll_uv_df<BSStencil>(const gsl_vector *x, void *params,
gsl_matrix *J);
.
.
.
template int ll_uv_f<CCStencil>(const gsl_vector *x, void *params,
gsl_vector *f);
template int ll_uv_f<BSStencil>(const gsl_vector *x, void *params,
gsl_vector *f);
.
.
.
The program compiles fine, and the functions int ll_uv_*() are found
by the nm utility to be in a .o file.
The program still won't link. Anyone have any ideas? Is this
something I'm doing wrong? The gcc version is 3.4.5-r1, and this is
on a xeon box running linux.
Thanks,
Brian
next reply other threads:[~2006-05-05 21:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-05 21:29 Brian Budge [this message]
2006-05-07 11:56 ` Perry Smith
2006-05-07 22:53 ` Brian Budge
2006-05-08 14:00 ` Perry Smith
2006-05-11 10:41 ` Brian Gough
2006-05-11 13:39 ` Brian Budge
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