The Visual C++ defines a bool as 1 byte. The sizeof a bool on the HP ANSI
compiler is 4 bytes. The HP documentation seems to indicate that a bool
should be 1 byte. Does the standard specify the sizeof bool or is it
implementation specific?
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Wilfred Boayue Jr (wsbjr@kreative.net) wrote:
: The Visual C++ defines a bool as 1 byte. The sizeof a bool on the HP ANSI
: compiler is 4 bytes. The HP documentation seems to indicate that a bool
: should be 1 byte.

Pardon the vendor-specific followup:  sizeof(bool) on HP's ANSI compiler
is 1.  Perhaps Wilfred is having a problem with structure padding.

    Ken Shrum
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Stroustrup says in [The C++ Programming Language, 3rd ed.], p. 75:

1 <= sizeof (bool) <= sizeof (long)


Ken Shrum wrote in message <69g20h$jkv@fcnews.fc.hp.com>...
>Wilfred Boayue Jr (wsbjr@kreative.net) wrote:
>: The Visual C++ defines a bool as 1 byte. The sizeof a bool on the HP ANSI
>: compiler is 4 bytes. The HP documentation seems to indicate that a bool
>: should be 1 byte.
>
>Pardon the vendor-specific followup:  sizeof(bool) on HP's ANSI compiler
>is 1.  Perhaps Wilfred is having a problem with structure padding.
>
>    Ken Shrum
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[This news message is cc-ed to Bjarnes]

Peter Kulczycki <Peter.Kulczycki@risc.uni-linz.ac.at> writes:

> Stroustrup says in [The C++ Programming Language, 3rd ed.], p. 75:
>
> 1 <= sizeof (bool) <= sizeof (long)
>
>
> Ken Shrum wrote in message <69g20h$jkv@fcnews.fc.hp.com>...
> >Wilfred Boayue Jr (wsbjr@kreative.net) wrote:
> >: The Visual C++ defines a bool as 1 byte. The sizeof a bool on the HP ANSI
> >: compiler is 4 bytes. The HP documentation seems to indicate that a bool
> >: should be 1 byte.
> >
> >Pardon the vendor-specific followup:  sizeof(bool) on HP's ANSI compiler
> >is 1.  Perhaps Wilfred is having a problem with structure padding.

This isn't garantied, and is false on gcc 2.7.2 for some
systems, where sizeof (long) is 4 and sizeof (bool) is 8.
egcs now reverted to sizeof (bool) <= sizeof (long), but
on other compilers, sizeof (bool) might still be greater
than sizeof (long).

--

Valentin Bonnard                mailto:bonnardv@pratique.fr
info about C++/a propos du C++: http://www.pratique.fr/~bonnardv/
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