Function scopeguard::guard_on_unwind

pub fn guard_on_unwind<T, F>(v: T, dropfn: F) -> ScopeGuard<T, F, OnUnwind>where
    F: FnOnce(T),

Create a new ScopeGuard owning v and with deferred closure dropfn.

Requires crate feature use_std.

Examples

For performance reasons, or to emulate “only run guard on unwind” in no-std environments, we can also use the default guard and simply manually defuse it at the end of scope like the following example. (The performance reason would be if the OnUnwind’s call to std::thread::panicking() is an issue.)

extern crate scopeguard;
 
use scopeguard::ScopeGuard;
{
    let guard = scopeguard::guard((), |_| { });

    // rest of the code here
     
    // we reached the end of scope without unwinding - defuse it
    ScopeGuard::into_inner(guard);
}