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# ScopeExit
This simple class provides an implementation of C++'s `SCOPE_EXIT`, or GoLang's `defer`.
To use, assign an instance of this object to a local variable. When that variable falls out of scope (or is explicitly `unset`, the callback passed to the constructor will be invoked. This is useful, for example, to aid cleanup at the end of a funciton.
```
function f(&$x) {
$x = 1;
$_ = new \PhpLang\ScopeExit(function() use (&$x) { $x = 2; });
// $x is still 1 at this point.
return 42;
// After the return, the local scope is cleaned up, the closure is invoked, and it's set to 2
}
f($a);
var_dump($a); // int(2)
```
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