Function scope_borrow

src/scope.rs:1048–1061

()

    use super::Scope;

    /// A reference-counted pointer to a scope. Used to capture a scope pointer
    /// in jobs without faking a lifetime. Holding a `ScopePtr` keeps the
    /// reference scope from being deallocated.
    pub struct ScopePtr<'scope, 'env>(*const Scope<'scope, 'env>);

    // SAFETY: Sending the `*const Scope` is sound because the pointee outlives
    // every `ScopePtr` (the refcount is held until drop), all cross-thread
    // mutation of the `Scope` goes through atomics, and its remaining fields are
    // written only during construction, so shared reads cannot race.
    unsafe impl Send for ScopePtr<'_, '_> {}

    impl<'scope, 'env> ScopePtr<'scope, 'env> {
        /// Creates a new reference-counted scope pointer which can be sent to other
        /// threads.
        pub fn new(scope: &Scope<'scope, 'env>) -> ScopePtr<'scope, 'env> {
            // Add a reference to ensure the scope will stay alive at least