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55be2836
编写于
3月 08, 2018
作者:
M
Maxim Nazarenko
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src/libcore/cell.rs
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src/libcore/cell.rs
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@@ -1176,10 +1176,10 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
/// is accessible by safe code (for example, because you returned it), then you must not access
/// the data in any way that contradicts that reference for the remainder of `'a`. For example, that
/// means that if you take the `*mut T` from an `UnsafeCell<T>` and case it to an `&T`, then until
/// that reference's lifetime expires, the data in `T` must remain immutable (modulo any
/// that reference's lifetime expires, the data in `T` must remain immutable (modulo any
/// `UnsafeCell` data found within `T`, of course). Similarly, if you create an `&mut T` reference
/// that is released to safe code, then you must not access the data within the `UnsafeCell` until
/// that reference expires.
/// that reference expires.
///
/// - At all times, you must avoid data races, meaning that if multiple threads have access to
/// the same `UnsafeCell`, then any writes must have a proper happens-before relation to all other
...
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@@ -1189,7 +1189,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
/// for single-threaded code:
///
/// 1. A `&T` reference can be released to safe code and there it can co-exit with other `&T`
/// references, but not with a `&mut T`
/// references, but not with a `&mut T`
///
/// 2. A `&mut T` reference may be released to safe code, provided neither other `&mut T` nor `&T`
/// co-exist with it. A `&mut T` must always be unique.
...
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