Struct TlsScopeGuard 

struct TlsScopeGuard {
    scope_ptr: NonNull<ProtectScope>,
}

Execute a closure with a new protection scope as the current TLS scope.

The scope is pushed onto the thread-local stack, the closure runs, and then the scope is popped and dropped (triggering UNPROTECT(n)).

Safety

Must be called from the R main thread.

Example

unsafe fn my_call(x: SEXP) -> SEXP {
    tls::with_protect_scope(|| {
        let x = tls::protect(x);
        let y = tls::protect(allocate_something());
        combine(x.get(), y.get())
    })
}

Guard that pops the TLS scope stack on drop (panic-safe cleanup).

Fields

scope_ptr: NonNull<ProtectScope>

Trait Implementations

impl Drop for TlsScopeGuard

fn drop(&mut self)

Executes the destructor for this type.