Re: [Vxl-users] building vxl-1.0-beta2 on MacOS X 10.1.5

[Peter V. <Pet...@es...>]

> The build went smooth until linking vcl_test.  At that time these symbols were
> undefined:
>
>      ___ls__H1Zd_R7ostreamRCt7complex1ZX01_RB0
>      ___ls__H1Zf_R7ostreamRCt7complex1ZX01_RB0

These look like "operator<<" (ostream output) functions for complex<double>
or so.  Use the "c++filt" program which should come with your compiler to
"demangle" those into C++ readable form.

Your compiler probably needs explicit instantiation of these symbols.
Normally, the following should suffice, somewhere in a .cxx file in the
directory vcl/Templates:

template ostream& operator<< (ostream&, vcl_complex<double> const&);

The thing is that this statement is already in
vcl/Templates/complex-instances.cxx
so probably your compiler does not provide this particular templated function.

In that case, and if all else fails, just define that function yourself, e.g.:

template <class T> ostream& operator<< (ostream& os, vcl_complex<T> const& c)
{
  return os << c.real() << '+' << c.imag() << 'j';
}

or something similar.


--	Peter.