Re: [ANN] Lua 5.4.0 (rc3) now available
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- Subject: Re: [ANN] Lua 5.4.0 (rc3) now available
- From: 云风 Cloud Wu <cloudwu@...>
- Date: 2020年5月13日 11:10:42 +0800
Roberto Ierusalimschy <roberto@inf.puc-rio.br> 于2020年5月13日周三 上午12:28写道：
>
> This code wastes up to seven bytes (due to alignment), compared with
> the original version. A better option would be to use 'offsetof' to
> compute the size of the rest of the structure:
>
> #define sizelstring(l) (offsetof(TString, bytes) + ((l) + 1) * sizeof(char))
'offsetof' would be better. And gcc allows 'char bytes[0];' or 'char bytes[];' .
It's C99 standard, but MSVC doesn't support it :(
https://stackoverflow.com/questions/20221012/unsized-array-declaration-in-a-struct
--
http://blog.codingnow.com
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