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I'm getting "Base class undefined" even though I did define the bloody thing.

Yaar Podshipnik

Yaar Podshipnik

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SCO said:
What i find hilarious about current compiler thinking is that everyone recognizes that C pointer arithmetic was a mistake... for... tundumdumdum... performance reasons
Click to expand...

I seriously can't believe anyone would say that... Any links?
 
SCO

SCO

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Shadorwun: Hong Kong
The lack of it permits a optimizing compiler to do whole program decisions about the underlying array that are not possible on C/++. Since a escaping int64 * can't be cast to a int32 * (for instance) it can use things like SSE instructions without having to prove it doesn't escape for AoT compilers (sometimes). For VM's it simplifies the logic of gc collections.
edit: there is even a keyword in C99 to restrict this kind of escaping:
C99 restrict keyword


I haven't got a quote, this is something i read a while ago probably on lambda the ultimate. Now that i'm looking at it it may be only the aliasing to other types of pointer. But if a future C inspired language gets rid of that they'd also get rid of arithmetic for the obvious security reasons that caused so much pain, possibly leaving only a approved 'union' type for if you really really want aliasing casts that is treated especially by the optimizer since it would be 'closed' on the types.
 
SCO

SCO

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Shadorwun: Hong Kong
Ok, not possible on some ancient codebases that still use casting pointers extensively. Still the warning will be a error in any new language.
 
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