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would using casts fix the problem?would using casts fix the problem?Posted Apr 16, 2008 20:27 UTC (Wed) by jengelh (subscriber, #33263)In reply to: would using casts fix the problem? by MathFox Parent article: GCC and pointer overflows
Or better yet don't cast at all.
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would using casts fix the problem? Posted Apr 16, 2008 21:29 UTC (Wed) by MathFox (subscriber, #6104) [Link] I guess that you missed the point completely. aend-a (no casts needed) should give 10 on any platform. The bit pattern in a pointer is implementation defined and that particular platform had (64-bits IIRC) word-based addresses in a 48 bit address space. The low 48 bits of a character pointer were the address of the word containing the character; the high bits addressed the byte in the word.Standard conforming programs don't rely on pointer layout.
would using casts fix the problem? Posted Apr 17, 2008 18:55 UTC (Thu) by hummassa (subscriber, #307) [Link] yes, aend - a (without cast) _is_ 10 in any platform, but (int)aend - (int)a is _undefined_ behaviour, because the bit pattern when converting from pointer to int is implementation-defined.
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