Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Add comment explaining why we don't impl From<F> for Stackfuture #19

Merged
merged 1 commit into from
Oct 25, 2022
Merged

Add comment explaining why we don't impl From<F> for Stackfuture #19

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 9 additions & 0 deletions src/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,15 @@ impl<'a, T, const STACK_SIZE: usize> StackFuture<'a, T, { STACK_SIZE }> {
where
F: Future<Output = T> + Send + 'a, // the bounds here should match those in the _phantom field
{
// Ideally we would provide this as:
//
// impl<'a, F, const STACK_SIZE: usize> From<F> for StackFuture<'a, F::Output, { STACK_SIZE }>
// where
// F: Future + Send + 'a
//
// However, libcore provides a blanket `impl<T> From<T> for T`, and since `StackFuture: Future`,
// both impls end up being applicable to do `From<StackFuture> for StackFuture`.

Self::try_from(future).unwrap_or_else(|f| {
match (Self::has_alignment_for_val(&f), Self::has_space_for_val(&f)) {
(false, false) => panic!(
Expand Down