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- Subject: Re: Suggestion : Built-in tuple type , was : packed structures
- From: 云风 Cloud Wu <cloudwu@...>
- Date: Fri, 5 Nov 2021 18:09:44 +0800
Spar <email@example.com> 于2021年11月5日周五 下午5:35写道：
> The way lua values are made in C is best for dynamic typing. No matter if it's a number or a table, they allocate the same size in memory with type info.
> Making it space efficient still needs metadata for the content and type checking. And maybe it won't be even performing because of that. LuaJIT has similar thing: ffi C definitions. But it's advantage is JIT compilation which makes the access to the structure in the most efficient way.
The way I mentioned for the tuple is dynamic typing, too. The
limitation is not changing types after creating.
The type info of tuples will store in a separating string object that
can be shared by short string intern mechanism, and the values can be
packed into a continuous memory (4 or 8 bytes per value without type