On 10/12/14 01:08 PM, Matt wrote: > Sorry if this has been covered before, and also that I'm a complete noob, but > I'm thinking about trying a first project in Rust, and trying to learn enough > to get started. > > My plan is for an on-disk key-value store. I'm going to end up writing arrays > of numbers to disk, and then needing to efficiently read them out of a > mmap-ed file. So I'm wondering how in Rust you efficiently/zero-copy-ly take > some slice of a read-only mmap and treat it as e.g. a vector of ints? > > I see Vec.from_raw_parts() and Vec.from_raw_buf(), but I don't really > understand the difference between them, and also they seem like they just > give you a vector of the pointer's type, so I don't know how you use them > convert the u8s you get from MemoryMap.data() into a vector of a different > type, e.g. 32 bit ints. > > It seems like there should be a higher level API for this kind of thing, > where "casting" a slice of a read-only memory buffer into an immutable vector > is not an unsafe operation (I mean, you can do that in Python ;) Either I > don't see it in the docs, or it doesn't exist yet; just wondering which :) > > Thanks! > > Matt
Keep in mind that the file won't be portable if you do this. It's why it's not a common pattern.
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