I need to do something like

#[cfg(target_pointer_width = "64")]
pub type PlatformWord = u64;
#[cfg(not(target_pointer_width = "64"))]
pub type PlatformWord = u32;

because I need a uXX type identical in size to usize. usize does not participate to Into/From conversions except for trivial cases, and I need to write trait bound like usize: Into<u32>.

The (debatable) logic is that target_pointer_width is a "natural" type for the architecture.

Possibilities are: PlatformWord, TargetWord, ArchWord, HostWord, but I'm leaning recently towards Usize.

I'm sure someone else had the same problem, so I'd love to hear suggestions and comments. This is just cosmetic, of course.

EDIT: I forgot to say that in the intended usage, values of type PlatformWord are basically never indices. So in an ideal world there would be a best integer type for a platform, with size possibly different from usize, and I'd use that.

NativeWord is another contender.

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