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Re: [PATCH] assert: Support types without operator== (int) [BZ #21972]

• From: Florian Weimer <fw at deneb dot enyo dot de>
• To: Paul Eggert <eggert at cs dot ucla dot edu>
• Cc: libc-alpha at sourceware dot org
• Date: Fri, 18 Aug 2017 18:57:50 +0200
• Subject: Re: [PATCH] assert: Support types without operator== (int) [BZ #21972]
• Authentication-results: sourceware.org; auth=none
• References: <20170818152602.3ED7141537DD0@oldenburg.str.redhat.com><1b0d8b27-96f4-20d8-4cbb-47828cff8157@cs.ucla.edu>

* Paul Eggert:> Florian Weimer wrote:>> + ((void) sizeof (static_cast<bool> (expr)), __extension__ ({ \>> Can we instead replace 'sizeof ((expr) == 0)' with 'sizeof !(expr)'?> That works in C, and if it also works in C++ it would avoid the need> for the #ifdef __cplusplus.It does not work in C++ because operator! could have been overloadedor deleted.  It is likely that a future C++ standard will only requirethat the expression can be contextually converted to bool, and this iswhat the static_cast approach relies upon.

• Follow-Ups:
  • Re: [PATCH] assert: Support types without operator== (int) [BZ #21972]
    • From: Paul Eggert

• References:
  • [PATCH] assert: Support types without operator== (int) [BZ #21972]
    • From: Florian Weimer
  • Re: [PATCH] assert: Support types without operator== (int) [BZ #21972]
    • From: Paul Eggert