On Wed, Mar 11, 2015 at 05:31:01PM +0100, Vincent Lefevre wrote:
> > (in C only one union member can be active at any time,
> > we as extension allow type punning through unions etc.)
> 
> I disagree that it is an extension. The standard does not say
> that "one union member can be active at any time".

That is not a standard wording, but what I meant is
6.2.6.1p7 - that when you store some union member other union members take
unspecified values.

        Jakub

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