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Update documentation in thread/local.rs.
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@ -443,6 +443,18 @@ impl<T: 'static> LocalKey<T> {
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}
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}
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/// Acquires a reference to the value in this TLS key, initializing it with
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/// `init` if it wasn't already initialized on this thread.
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///
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/// If `init` was used to initialize the thread local variable, `None` is
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/// passed as the first argument to `f`. If it was already initialized,
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/// `Some(init)` is passed to `f`.
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///
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/// # Panics
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///
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/// This function will panic if the key currently has its destructor
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/// running, and it **may** panic if the destructor has previously been run
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/// for this thread.
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fn initialize_with<F, R>(&'static self, init: T, f: F) -> R
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where
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F: FnOnce(Option<T>, &T) -> R,
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@ -488,9 +500,12 @@ impl<T: 'static> LocalKey<Cell<T>> {
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/// ```
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#[unstable(feature = "local_key_cell_methods", issue = "92122")]
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pub fn set(&'static self, value: T) {
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self.initialize_with(Cell::new(value), |init, cell| {
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if let Some(init) = init {
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cell.set(init.into_inner());
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self.initialize_with(Cell::new(value), |value, cell| {
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if let Some(value) = value {
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// The cell was already initialized, so `value` wasn't used to
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// initialize it. So we overwrite the current value with the
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// new one instead.
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cell.set(value.into_inner());
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}
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});
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}
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@ -593,7 +608,7 @@ impl<T: 'static> LocalKey<RefCell<T>> {
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///
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/// # Panics
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///
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/// Panics if the value is currently borrowed.
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/// Panics if the value is currently mutably borrowed.
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///
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/// Panics if the key currently has its destructor running,
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/// and it **may** panic if the destructor has previously been run for this thread.
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@ -660,6 +675,8 @@ impl<T: 'static> LocalKey<RefCell<T>> {
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///
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/// # Panics
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///
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/// Panics if the value is currently borrowed.
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///
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/// Panics if the key currently has its destructor running,
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/// and it **may** panic if the destructor has previously been run for this thread.
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///
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@ -681,8 +698,11 @@ impl<T: 'static> LocalKey<RefCell<T>> {
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/// ```
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#[unstable(feature = "local_key_cell_methods", issue = "92122")]
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pub fn set(&'static self, value: T) {
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self.initialize_with(RefCell::new(value), |init, cell| {
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if let Some(init) = init {
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self.initialize_with(RefCell::new(value), |value, cell| {
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if let Some(value) = value {
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// The cell was already initialized, so `value` wasn't used to
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// initialize it. So we overwrite the current value with the
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// new one instead.
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cell.replace(init.into_inner());
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}
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});
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