44 lines
835 B
Rust
44 lines
835 B
Rust
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//@check-pass
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//! This is the reduced version of the "Linux kernel vtable" use-case.
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#![feature(const_mut_refs, const_refs_to_static)]
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use std::ptr::addr_of_mut;
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#[repr(C)]
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struct ThisModule(i32);
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trait Module {
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const THIS_MODULE_PTR: *mut ThisModule;
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}
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struct MyModule;
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// Generated by a macro.
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extern "C" {
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static mut THIS_MODULE: ThisModule;
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}
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// Generated by a macro.
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impl Module for MyModule {
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const THIS_MODULE_PTR: *mut ThisModule = unsafe { addr_of_mut!(THIS_MODULE) };
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}
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struct Vtable {
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module: *mut ThisModule,
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foo_fn: fn(*mut ()) -> i32,
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}
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trait Foo {
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type Mod: Module;
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fn foo(&mut self) -> i32;
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}
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fn generate_vtable<T: Foo>() -> &'static Vtable {
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&Vtable {
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module: T::Mod::THIS_MODULE_PTR,
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foo_fn: |ptr| unsafe { &mut *ptr.cast::<T>() }.foo(),
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}
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}
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fn main() {}
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