class complex<FLT>

[Gabriel Dos Reis]

Zoltan Nagy <Z.Nagy@atomki.hu> writes:

| Gabriel Dos Reis wrote:
| 
| > Zoltan Nagy <Z.Nagy@atomki.hu> writes:
| >
| > | Hi,
| > |
| > | The complex specializations don't work.
| >
| > Please, could you expand a little bit on this?
| >
| 
| I think  using the  __complex__   C extension is an extra source of the
| bugs.

Not of bug. Of problem in the back-end.  That an enterily different
issue. And I'm not playing a semantic game.

I beleive v3's implementation to be pretty right.


| On the other hand you have to make a  C libriary which contains the
| complex arithmetic functions.
| This functions are not part of the stdc++ library.

If done appropriately, then no conforming program can tell.  So I
think the point is moot.

| ... I think these are
| unnecessary objects in the stdc++ library.

I'm not convinced.

| You can write the complex arithmetic function directly in C++ and in
| this case you can use the C++ math
| functions are declared in header <cmath>.
| 
| I think you should use the usual implementation of complex classes with
| the following simple
| data members:
| value_type _M_real, _M_imag;

I still don't isee n what that will simplifiy the specializations as
they're required anyway by the standard.


>From a practical point of view, it is desirable to share C++ complex<>
fonctionnalities with those found in C99.

The real issue is to lobby for a fix in the compiler.

-- Gaby