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);
}