File: const_generics.rs

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#[repr(transparent)]
pub struct CArrayString<const CAP: usize> {
    pub chars: [i8; CAP],
}

pub const TITLE_SIZE: usize = 80;

#[repr(C)]
pub struct Book {
    pub title: CArrayString<TITLE_SIZE>,
    pub author: CArrayString<40>,
}

#[no_mangle]
pub extern "C" fn root(a: *mut Book) {}