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Diffstat (limited to 'vendor/addr2line/src/lazy.rs')
-rw-r--r-- | vendor/addr2line/src/lazy.rs | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/vendor/addr2line/src/lazy.rs b/vendor/addr2line/src/lazy.rs deleted file mode 100644 index 2df2ed6..0000000 --- a/vendor/addr2line/src/lazy.rs +++ /dev/null @@ -1,31 +0,0 @@ -use core::cell::UnsafeCell; - -pub struct LazyCell<T> { - contents: UnsafeCell<Option<T>>, -} -impl<T> LazyCell<T> { - pub fn new() -> LazyCell<T> { - LazyCell { - contents: UnsafeCell::new(None), - } - } - - pub fn borrow(&self) -> Option<&T> { - unsafe { &*self.contents.get() }.as_ref() - } - - pub fn borrow_with(&self, closure: impl FnOnce() -> T) -> &T { - // First check if we're already initialized... - let ptr = self.contents.get(); - if let Some(val) = unsafe { &*ptr } { - return val; - } - // Note that while we're executing `closure` our `borrow_with` may - // be called recursively. This means we need to check again after - // the closure has executed. For that we use the `get_or_insert` - // method which will only perform mutation if we aren't already - // `Some`. - let val = closure(); - unsafe { (*ptr).get_or_insert(val) } - } -} |