Re: What gives us the macro GSEAL()?

[Colomban Wendling <ban-ubuntu club-internet fr>]

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Hi,

Grzegorz Kuczyński a écrit :
> I want to know what gives macro GSEAL in struct GtkWindow.
AFAIK, it is used to hide members of GTK+ and GDK structures that will
become opaques in future releases (3.0 or so); then it makes easy to
see if a source must be updated not to use direct access of members.
In practice, compilation of a source code accessing directly struct
members with GSEAL_ENABLE defined will fail because member have
another name (_g_sealed__<name>).
> And a macro GSEAL (_g_sealed__ ## ident) work only on win32? I not
> understand the expression: _g_sealed__ ## ident ??
foo##bar is a C preprocessor directive that concatenated two tokens.
In practice, 'GSEAL(foo)' will expand to 'foo' if GSEAL_ENABLE is NOT
defined and to '_g_sealed__foo' if it is.

Regards,
Colomban
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