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Check that the `min_align_of` the both types in a `PartialVec` matches 

This is important because the underlying allocator of the `Vec` passes that
information to the deallocator which needs the guarantee that it is the same
parameters that were also passed to the allocation function.
This commit is contained in:
Tobias Bucher 2014-08-08 23:52:15 +02:00
parent 23f2c78d21
commit 5efa232160
1 changed files with 6 additions and 2 deletions
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8
src/libcollections/vec.rs
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@ -1756,6 +1756,8 @@ pub mod raw {
// of type `T`.
//
// (g) The size of `T` and `U` is equal and non-zero.
//
// (h) The `min_align_of` of `T` and `U` is equal.
pub struct PartialVec<T,U> {
vec: Vec<T>,
@ -1773,12 +1775,14 @@ impl<T,U> PartialVec<T,U> {
///
/// Fails if `T` and `U` have differing sizes or are zero-sized.
pub fn from_vec(mut vec: Vec<T>) -> PartialVec<T,U> {
// FIXME: Assert that the types `T` and `U` have the same size.
// FIXME: Assert statically that the types `T` and `U` have the same
// size.
//
// These asserts make sure (g) is satisfied.
// These asserts make sure (g) and (h) are satisfied.
assert!(mem::size_of::<T>() != 0);
assert!(mem::size_of::<U>() != 0);
assert!(mem::size_of::<T>() == mem::size_of::<U>());
assert!(mem::min_align_of::<T>() == mem::min_align_of::<U>());
let start = vec.as_mut_ptr();