Dummy, initial commit.

lexical-util/src/i256.rs

@@ -0,0 +1,27 @@
+//! An signed 256-bit integer type.
+//!
+//! This aims to have feature parity with Rust's signed
+//! integer types, such as [i32][core::i32]. The documentation
+//! is based off of [i32][core::i32] for each method/member.
+
+// TODO: Document
+// TODO: Feature gate this...
+
+// FIXME: Add support for [Saturating][core::num::Saturating] and
+// [Wrapping][core::num::Wrapping] when we drop support for <1.74.0.
+
+/// The 256-bit signed integer type.
+///
+/// This has the same binary representation as Apache Arrow's types,
+/// and therefore can safely be transmuted from one to the other.
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Default, PartialEq, Eq, Hash)]
+#[repr(C)]
+pub struct i256 {
+    lo: u128,
+    hi: i128,
+}
+
+impl i256 {
+    // TODO: Here
+}

lexical-util/src/lib.rs

@@ -163,12 +163,14 @@ pub mod error;
 pub mod extended_float;
 pub mod f16;
 pub mod format;
+pub mod i256;
 pub mod iterator;
 pub mod mul;
 pub mod num;
 pub mod options;
 pub mod result;
 pub mod step;
+pub mod u256;
 
 mod api;
 mod feature_format;