bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/test-utils/src/minicore.rs')
-rw-r--r--crates/test-utils/src/minicore.rs62
1 files changed, 62 insertions, 0 deletions
diff --git a/crates/test-utils/src/minicore.rs b/crates/test-utils/src/minicore.rs
index ca1dbf532c..f403ef8ee0 100644
--- a/crates/test-utils/src/minicore.rs
+++ b/crates/test-utils/src/minicore.rs
@@ -11,6 +11,7 @@
//! add:
//! as_ref: sized
//! bool_impl: option, fn
+//! cell: copy, drop
//! clone: sized
//! coerce_unsized: unsize
//! copy: clone
@@ -139,6 +140,52 @@ pub mod hash {
}
// endregion:hash
+// region:cell
+pub mod cell {
+ use crate::mem;
+
+ #[lang = "unsafe_cell"]
+ pub struct UnsafeCell<T: ?Sized> {
+ value: T,
+ }
+
+ impl<T> UnsafeCell<T> {
+ pub const fn new(value: T) -> UnsafeCell<T> {
+ UnsafeCell { value }
+ }
+
+ pub const fn get(&self) -> *mut T {
+ self as *const UnsafeCell<T> as *const T as *mut T
+ }
+ }
+
+ pub struct Cell<T: ?Sized> {
+ value: UnsafeCell<T>,
+ }
+
+ impl<T> Cell<T> {
+ pub const fn new(value: T) -> Cell<T> {
+ Cell { value: UnsafeCell::new(value) }
+ }
+
+ pub fn set(&self, val: T) {
+ let old = self.replace(val);
+ mem::drop(old);
+ }
+
+ pub fn replace(&self, val: T) -> T {
+ mem::replace(unsafe { &mut *self.value.get() }, val)
+ }
+ }
+
+ impl<T: Copy> Cell<T> {
+ pub fn get(&self) -> T {
+ unsafe { *self.value.get() }
+ }
+ }
+}
+// endregion:cell
+
// region:clone
pub mod clone {
#[lang = "clone"]
@@ -220,6 +267,13 @@ pub mod mem {
// endregion:manually_drop
pub fn drop<T>(_x: T) {}
+ pub const fn replace<T>(dest: &mut T, src: T) -> T {
+ unsafe {
+ let result = *dest;
+ *dest = src;
+ result
+ }
+ }
}
// endregion:drop
@@ -710,6 +764,14 @@ pub mod option {
None => default,
}
}
+ // region:result
+ pub const fn ok_or<E>(self, err: E) -> Result<T, E> {
+ match self {
+ Some(v) => Ok(v),
+ None => Err(err),
+ }
+ }
+ // endregion:result
// region:fn
pub fn and_then<U, F>(self, f: F) -> Option<U>
where