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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
| commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
| tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /third_party/rust/generic-array/README.md | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip | |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/generic-array/README.md')
| -rw-r--r-- | third_party/rust/generic-array/README.md | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/third_party/rust/generic-array/README.md b/third_party/rust/generic-array/README.md new file mode 100644 index 0000000000..cf54f40550 --- /dev/null +++ b/third_party/rust/generic-array/README.md @@ -0,0 +1,62 @@ +[](https://crates.io/crates/generic-array)
+[](https://travis-ci.org/fizyk20/generic-array)
+# generic-array
+
+This crate implements generic array types for Rust.
+
+**Requires minumum Rust version of 1.36.0, or 1.41.0 for `From<[T; N]>` implementations**
+
+[Documentation](http://fizyk20.github.io/generic-array/generic_array/)
+
+## Usage
+
+The Rust arrays `[T; N]` are problematic in that they can't be used generically with respect to `N`, so for example this won't work:
+
+```rust
+struct Foo<N> {
+ data: [i32; N]
+}
+```
+
+**generic-array** defines a new trait `ArrayLength<T>` and a struct `GenericArray<T, N: ArrayLength<T>>`, which let the above be implemented as:
+
+```rust
+struct Foo<N: ArrayLength<i32>> {
+ data: GenericArray<i32, N>
+}
+```
+
+The `ArrayLength<T>` trait is implemented by default for [unsigned integer types](http://fizyk20.github.io/generic-array/typenum/uint/index.html) from [typenum](http://fizyk20.github.io/generic-array/typenum/index.html) crate:
+
+```rust
+use generic_array::typenum::U5;
+
+struct Foo<N: ArrayLength<i32>> {
+ data: GenericArray<i32, N>
+}
+
+fn main() {
+ let foo = Foo::<U5>{data: GenericArray::default()};
+}
+```
+
+For example, `GenericArray<T, U5>` would work almost like `[T; 5]`:
+
+```rust
+use generic_array::typenum::U5;
+
+struct Foo<T, N: ArrayLength<T>> {
+ data: GenericArray<T, N>
+}
+
+fn main() {
+ let foo = Foo::<i32, U5>{data: GenericArray::default()};
+}
+```
+
+In version 0.1.1 an `arr!` macro was introduced, allowing for creation of arrays as shown below:
+
+```rust
+let array = arr![u32; 1, 2, 3];
+assert_eq!(array[2], 3);
+```
|