Macro tl_genparams

macro_rules! tl_genparams {
    ( $($lt:lifetime),* $(,)? ; $($ty:expr)? ; $($const_p:expr)? ) => { ... };
}

Can be used to construct CompGenericParams, when manually implementing StableAbi.

This stores indices and ranges for the type and/or const parameters taken from the SharedVars stored in the same TypeLayout where this is stored.

Syntax

tl_genparams!( (<lifetime>),* ; <convertible_to_startlen>; <convertible_to_startlen> )

<convertible_to_startlen> is a range of indices into a slice:

- : No elements.

-i: Uses the ith element.

-i..j: Uses the elements from i up to j (exclusive).

-i..=j: Uses the elements from i up to j (inclusive).

-x: StartLen: Uses the elements from x.start() up to x.end() (exclusive).

For type parameters, this conceptually references the elements from the slice returned by SharedVars::type_layouts.

For const parameters, this conceptually references the elements from the slice returned by SharedVars::constants.

Example

use abi_stable::{
    type_layout::CompGenericParams,
    tl_genparams,
};

const NO_ARGUMENTS: CompGenericParams = tl_genparams!(;;);

const THREE_TYPE_ARGUMENTS: CompGenericParams = tl_genparams!(; 0..=2;);

const ALL_ARGUMENTS: CompGenericParams = tl_genparams!('a,'b,'c,'d; 0; 0..3);