egcs-19990629 complex instation problem

[Mumit Khan]

jarausch@igpm.rwth-aachen.de writes:
> Hi,
> 
> Trying to explicitly instantiate (snaphot 19990629) doesn't work in the
> following case. This did work in egcs-1.1.2
> 
> #include <iostream>
> #include <complex>
>      template istream& operator>>(istream& , complex<double>&);
> 
> gives
> 
> TI.C: In instantiation of `operator >><double>(istream &, complex<double> &)'
> :
> TI.C:3:   instantiated from here
> TI.C:3: explicit instantiation of `operator >><double>(istream &, complex<dou
> ble> &)' but no definition available
> 
> The code is in
> 
> /usr/local/include/g++-2/std/complext.cc
> 
> and 
> /usr/local/include/g++-2/complex
> 
> includes
> /usr/local/include/g++-2/std/complext.h
> 
> 
> Thanks for a hint

Here's a hint (and this is a general troubleshooting tool with GCC):
  
  $ gcc -save-temps -c T1.C

Now look inside T1.ii and see if you find the *definition* of 
  `template <class T> istream& operator >> (istream&, complex<T>&);'

Surprise, it's not there; <std/complext.cc> is not included by any
of the files you're including, and that's where the definition is,
and is used when building the libstdc++ runtime library.

Hack:
  
  #include <iostream>
  #include <complex>
  #include <std/complext.cc>		// make definitions available
  using namespace std;

  template istream& operator>>(istream& , complex<double>&);

Regards,
Mumit