mirror of https://github.com/rust-lang/rust
31 lines
757 B
Rust
31 lines
757 B
Rust
#![feature(const_type_id)]
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use std::alloc::Layout;
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use std::any::TypeId;
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use std::mem::transmute;
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use std::ptr::drop_in_place;
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pub struct VTable {
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layout: Layout,
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type_id: TypeId,
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drop_in_place: unsafe fn(*mut ()),
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}
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impl VTable {
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pub fn new<T>() -> &'static Self {
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const {
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&VTable {
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layout: Layout::new::<T>(),
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type_id: TypeId::of::<T>(),
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//~^ ERROR the parameter type `T` may not live long enough
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//~| ERROR the parameter type `T` may not live long enough
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drop_in_place: unsafe {
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transmute::<unsafe fn(*mut T), unsafe fn(*mut ())>(drop_in_place::<T>)
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},
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}
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}
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}
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}
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fn main() {}
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