Macro abi_stable::tl_genparams

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

Use this when constructing a abi_stable::abi_stability::TypeLayoutParams when manually implementing StableAbi, to more ergonomically initialize the generics field.

Example

A type with lifetime type,and lifetime parameters:

use abi_stable::{
    tl_genparams,
    StableAbi,
    abi_stability::type_layout::GenericParams
};

struct Reference<'a,'b,T,U>(&'a T,&'b U);

impl<'a,'b,T,U> Reference<'a,'b,T,U>
where
    T:StableAbi,
    U:StableAbi,
{
    const GENERICS:GenericParams=
        tl_genparams!('a,'b ; T,U ; );
}

Example

A type with lifetime,type,and const parameters.

Note that while this example won't compile until const parameters are usable,

use abi_stable::{
    tl_genparams,
    StableAbi,
    abi_stability::type_layout::GenericParams
};

struct ArrayReference<'a,'b,T,U,const SIZE_T:usize,const SIZE_U:usize>{
    first:&'a [T;SIZE_T],
    second:&'b [U;SIZE_U],
}

impl<'a,'b,T,U,const SIZE_T:usize,const SIZE_U:usize> 
    Reference<'a,'b,T,U,SIZE_T,SIZE_U>
where
    T:StableAbi,
    U:StableAbi,
{
    const GENERICS:GenericParams=
        tl_genparams!('a,'b ; T,U ; SIZE_T,SIZE_U );
}