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- Subject: Re: Caveat with lua_pushlightuserdata(L, (void *)&key)
- From: "Julien Cugnière" <julien.cugniere@...>
- Date: Sat, 24 Jun 2006 14:33:58 +0200
2006/6/24, Mike Pall <firstname.lastname@example.org>:
static const int regkey_foo = 1;
static const int regkey_bar = 1;
The problem is that the compiler/linker may decide to join
constants with identical _values_. Unfortunately this makes the
_addresses_ the same, too.
Wow, that's interesting.
- Or use the addresses of non-const static variables.
Hmm, pushing the idea further, couldn't a smart optimizing compiler
automatically constify non-const variables that the code does not
modify ? You would then have to use volatile non-const static
Or is the compiler able to make any assumptions about constness once
you take the address of a variable and cast it to (void*) ?
Anyway, here is a simple way to ensure that your constants are unique
(assuming this legal C):
static const void* regkey1 = ®key1;
static const void* regkey2 = ®key2;