Re: bool or BOOL in MFC projects

"Giovanni Dicanio" <>
Wed, 19 Dec 2007 10:29:54 +0100
"Joseph M. Newcomer" <> ha scritto nel messaggio

Windows was carefully designed so every BOOL value returned from the API
was either 0 or
1. The Win9x people couldn't be bothered with doing the job right, so
they just returned
any value they felt like, calling any nonzero value "not-false". So the
main reason we
have problems was slovenly programming in the fake operating system.
Given it only took a
couple instructions to do the job right, it was really an extreme case of
sloppy thinking
trumping correct programming.

Hi Joe,

I don't have your historical perspective.

However, reading from a random BOOL-returning API, like ::IsChild:

the documentation clearly states that:

"If the window is a child or descendant window of the specified parent
window, the return value is *nonzero*.
If the window is not a child or descendant window of the specified parent
window, the return value is zero."

I think that when we program with an API, the *interface* documentation is
what matters. We must respect the interface, and it seems that the interface
is clear in that case.

It's like what I would define IMHO a "buggy" COM code, when people do e.g.

 HRESULT hr = pSomeInterface->SomeMethod(...);
 if ( hr == E_FAIL )

or if ( hr == DD_OK ) ...

IMHO, we should write more "robust" code, using ad hoc helper macros like
FAILED() and SUCCEEDED(), e.g.

 if ( FAILED(hr) ) // for generic failure


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