Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 54 insertions, 0 deletions

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+# memoffset #
+
+[![](http://meritbadge.herokuapp.com/memoffset)](https://crates.io/crates/memoffset)
+
+C-Like `offset_of` functionality for Rust structs.
+
+Introduces the following macros:
+ * `offset_of!` for obtaining the offset of a member of a struct.
+ * `span_of!` for obtaining the range that a field, or fields, span.
+
+`memoffset` works under `no_std` environments.
+
+## Usage ##
+Add the following dependency to your `Cargo.toml`:
+
+```toml
+[dependencies]
+memoffset = "0.3"
+```
+
+Versions ">= 0.3" can be used in a constant expression context (though not in a `const fn`),
+but require a rust version greater than or equal to 1.33.
+These versions will compile fine with rustc versions greater or equal to 1.19, but will
+lack support for constant expression.
+
+If you wish to use an older rustc version, lock your dependency to "0.2"
+
+Add the following lines at the top of your `main.rs` or `lib.rs` files.
+
+```rust
+#[macro_use]
+extern crate memoffset;
+```
+
+## Examples ##
+```rust
+#[repr(C, packed)]
+struct Foo {
+	a: u32,
+	b: u32,
+	c: [u8; 5],
+	d: u32,
+}
+
+assert_eq!(offset_of!(Foo, b), 4);
+assert_eq!(offset_of!(Foo, c[3]), 11);
+
+assert_eq!(span_of!(Foo, a),          0..4);
+assert_eq!(span_of!(Foo, a ..  c),    0..8);
+assert_eq!(span_of!(Foo, a ..  c[1]), 0..9);
+assert_eq!(span_of!(Foo, a ..= c[1]), 0..10);
+assert_eq!(span_of!(Foo, ..= d),      0..14);
+assert_eq!(span_of!(Foo, b ..),       4..17);
+```