Re: [OFF-TOPIC] C++ template question

[Jason Gunthorpe <jgg@gpu.srv.ualberta.ca>]

On Fri, 31 Oct 1997, Shaleh wrote:

> This is mostly off topic but....
> 
> How do you compile a template class into an object file WITHOUT
> instantiating it???  g++ happily compiles the .o file but bombs out when
> it tries to link later.  Any suggestions happily accepted.  Either to
> the list or me personally.

There are only two possible things you could want, I'm not sure which:

1) Cause the compiler to include an instance of the template in a
specific .o file:

#include <vector>

template class vector<int>;

gcc t.cc

2) Prevent the compiler from including an instance of any template in 
any .o file

#include <vector>

vector<int> A;

gcc -fno-implicit-templates t.cc

You will want to use a combination of the two above schemes if your
program has a number of tempaltes. Make one file that contains all of the
template instances explicitly instanciated and compile it without
-fno-implicit-templates. Use -fno-implicit-templates on the rest of your
modules.

Jason


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