Method try_insert

cranelift/entity/src/map.rs:120–129

Like `insert` but returns an error on allocation failure.

(&mut self, k: K, v: V)

    /// Like `insert` but returns an error on allocation failure.
    pub fn try_insert(&mut self, k: K, v: V) -> Result<Option<V>, OutOfMemory> {
        let i = k.index();
        if i < self.elems.len() {
            Ok(Some(core::mem::replace(&mut self.elems[i], v)))
        } else {
            self.try_resize(i + 1)?;
            self.elems[i] = v;
            Ok(None)
        }
    }

    /// Remove the element at `k`, if it exists, replacing it with the default
    /// value.