fixed_typemap

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Implements typemaps that support a lot of extra funcctionality using procedural macros. docs.rs has a lot more than this readme, including a mini-tutorial and worked example. You can use this to:

• Implement fixed typemaps which don't allocate, and store all their members inline initialized to default values.
• Use this to implement something like the fields-in-traits proposal, where you "name" fields generically using types.
• Generate iteration helpers which can iterate over the typemap as trait objects for any number of traits (e.g. this can replace HashMap<TypeId, Box<dyn MyTrait>>, bringing the rest of the functionality along for the ride and also let you do as many traits as you want at once).
• Add an optional dynamic section which uses a HashMap to enable storing any type.

no_std support is WIP in the sense that it's basically done but I don't know enough to reliably finish it. Doing so shouldn't be hard and I'm very open to contributions which do so and preferrably provide CI configuration.

lib.rs:

Internals for fixed_typemap, a crate for producing typemaps with extended functionality over a set of known types.

This is a set of internal details used by the proc macros, and shouldn't be depended on directly. Instead, depend on and use fixed_typemap as this is probably what you're looking for.