ANSI C++ changes revisited

[Peter.Vanroose at esat.kuleuven.ac.be]

> just a not about the "using std::ostream"...  You should NOT do this if
> it is in a header file, because any who include you header file will
> have the "using std::ostream" effctive for his files...

Actually, the most flexible solution (which I would advocate) is not to
chose for either "std::ostream" or "using std" in your source files, but
instead place a conditional "using std::ostream" in a header file that
is included anywhere.

E.g., one could have a file vtk_iostream.h that says (for example :-)

#if defined(WIN32) || defined(I_WANT_STD) && !(__GNUC__ < 3)
#include <iostream>
using std::ios;
using std::cin;
using std::cout;
(etc)
#else
#include <iostream.h>
#endif

With the only extra discipline that you always have to include vtk_iostream.h
instead of iostream.h, this makes it completely transparant and user-selectable
which of the two forms are used throughout your code.  And for any compiler.


--                  Peter Vanroose
                    Electrotechnical Department (ESAT/PSI)
                    K.U. Leuven, Belgium.
                    Peter.Vanroose at esat.kuleuven.ac.be
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