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ruststaticmutablerust-proc-macros

Create a vector with macro iterator syntax

How can I create a new vector with the iterator Rust macro syntax?

I am trying this:

unsafe { 
    MUT_STATIC_VAR = vec![
       #(#my_outher_vector_data)*,
    ];
}

Full explanation: I am trying to reasign data that I write in one mut static var of type: Vec when the macro it's spanded at compile time. When I try to retrieve the data at runtime, the global it's empty, so I am rewiring the data that I want in main().

Recap. I am just want to assign the content of one vector to another, but neither array or Vec<T> implements ToTokens.

Compiler error:

`main` function not found in crate `my_crate`

Thanks

Solution

  • To initialize the content, Iterators are able to use macro #(#...)*, syntax.

    let other_as_iter = my_outher_vector_data.iter();


quote {
    unsafe { 
        MUT_STATIC_VAR = vec![
           #(#other_as_iter)*,
        ];
    }
}