Re: Caveat with lua_pushlightuserdata(L, (void *)&key)

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• Subject: Re: Caveat with lua_pushlightuserdata(L, (void *)&key)
• From: David Jones <drj@...>
• Date: 2006年6月26日 11:33:37 +0100

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On 26 Jun 2006, at 09:33, Andreas Stenius wrote:

Julien Cugnière skrev:

Anyway, here is a simple way to ensure that your constants are unique
(assuming this legal C):
 static const void* regkey1 = &regkey1;
 static const void* regkey2 = &regkey2;

No, &regkey1 is not a constant expression, although the result is constant.

Doesn't matter. In C it's legal (though probably stupid) to take a pointer to a const object and convert it to a pointer to a non-const object. No idea about C++. Just one of the many ways in which const is broken and surprises programmers.

drj

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• Follow-Ups:
  • Re: Caveat with lua_pushlightuserdata(L, (void *)&key), Glenn Maynard

• References:
  • Caveat with lua_pushlightuserdata(L, (void *)&key), Mike Pall
  • Re: Caveat with lua_pushlightuserdata(L, (void *)&key), Julien Cugnière
  • Re: Caveat with lua_pushlightuserdata(L, (void *)&key), Andreas Stenius

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