makepad-objc-sys 1.0.0

Makepad fork of SSheldon/rust-objc without libc dep.
Documentation 
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use objc_exception;

use rc::StrongPtr;
use runtime::Object;

pub unsafe fn try<F, R>(closure: F) -> Result<R, StrongPtr>
        where F: FnOnce() -> R {
    objc_exception::try(closure).map_err(|exception| {
        StrongPtr::new(exception as *mut Object)
    })
}