[boost] Re: [noncopyable.hpp] small fix for Borland

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2004-01-03 14:01:54

"Rob Williscroft" <rtw_at_[hidden]> wrote

> #if (defined __BORLANDC__) && (__BORLANDC__ <= 0x564)
> #pragma option -Ve // Enable EBO
> #include <pshpack1.h>
> #endif
>
> > class noncopyable
> > {
> > #if (defined __BORLANDC__) && (__BORLANDC__ <= 0x564)
> >     char dummy; // BCB would use 8 bytes by default
> > #endif
> >  protected:
> >  ....
> };
>
> #if (defined __BORLANDC__) && (__BORLANDC__ <= 0x564)
> #include <poppack.h>
> #endif
>
>
Wow, that's what I was looking for! It is definitely better than dummy byte.

I tested it with BCB 6 patch 4. It works for multiple inheritance too.

AFAIK using <pophack1.h> requires patch #4 installed, with original BCB
version it screw up data alignement. (The patch is freely downloadable.)
This works without patch #4:

________________________

#if (defined __BORLANDC__) && (__BORLANDC__ <= 0x564)
#  pragma option push -Ve // Enable EBO
#  pragma pack(push, 1)
#endif
...
code
...
#if (defined __BORLANDC__) && (__BORLANDC__ <= 0x564)
#  pragma pack(pop)
#  pragma option pop
#endif
________________________

Thanks,
/Pavel