rust (original) (raw)

Feature gate: #![feature(once_cell_try_insert)]

This is a tracking issue for OnceCell::try_insert() and OnceLock::try_insert().

This adds a method similarly to OnceCell/Lock::set() but returns a reference at the same time. This is also similar to OnceCell/Lock::get_or_init() but the return value also tells you if the value was actually inserted or if the OnceCell/Lock was already occupied.