Added Bounded numeric trait.

commit-id:fa9cd2f7

corelib/src/num/traits.cairo

@@ -7,6 +7,9 @@ pub use one::One;
 pub mod bit_size;
 pub use bit_size::BitSize;
 
+mod bounded;
+pub use bounded::Bounded;
+
 #[feature("corelib-internal-use")]
 pub mod ops;
 pub use ops::overflowing::{OverflowingAdd, OverflowingSub, OverflowingMul};

corelib/src/num/traits/bounded.cairo

@@ -0,0 +1,69 @@
+/// A trait defining minimum and maximum bounds for numeric types.
+/// Only supports types that can have a constant value.
+///
+/// Example:
+/// ```
+/// Bounded::<MyType>::MAX;
+/// ```
+pub trait Bounded<T> {
+    /// The minimum allowable value.
+    const MIN: T;
+    /// The maximum allowable value.
+    const MAX: T;
+}
+
+impl BoundedU8 of Bounded<u8> {
+    const MIN: u8 = 0x0;
+    const MAX: u8 = 0xff;
+}
+
+impl BoundedU16 of Bounded<u16> {
+    const MIN: u16 = 0x0;
+    const MAX: u16 = 0xffff;
+}
+
+impl BoundedU32 of Bounded<u32> {
+    const MIN: u32 = 0x0;
+    const MAX: u32 = 0xffffffff;
+}
+
+impl BoundedU64 of Bounded<u64> {
+    const MIN: u64 = 0x0;
+    const MAX: u64 = 0xffffffffffffffff;
+}
+
+impl BoundedU128 of Bounded<u128> {
+    const MIN: u128 = 0x0;
+    const MAX: u128 = 0xffffffffffffffffffffffffffffffff;
+}
+
+impl BoundedU256 of Bounded<u256> {
+    const MIN: u256 = 0x0;
+    const MAX: u256 = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
+}
+
+// Implementations for signed integer types
+impl BoundedI8 of Bounded<i8> {
+    const MIN: i8 = -0x80;
+    const MAX: i8 = 0x7f;
+}
+
+impl BoundedI16 of Bounded<i16> {
+    const MIN: i16 = -0x8000;
+    const MAX: i16 = 0x7fff;
+}
+
+impl BoundedI32 of Bounded<i32> {
+    const MIN: i32 = -0x80000000;
+    const MAX: i32 = 0x7fffffff;
+}
+
+impl BoundedI64 of Bounded<i64> {
+    const MIN: i64 = -0x8000000000000000;
+    const MAX: i64 = 0x7fffffffffffffff;
+}
+
+impl BoundedI128 of Bounded<i128> {
+    const MIN: i128 = -0x80000000000000000000000000000000;
+    const MAX: i128 = 0x7fffffffffffffffffffffffffffffff;
+}

corelib/src/num/traits/ops/saturating.cairo

@@ -21,36 +21,36 @@ pub trait SaturatingMul<T> {
 
 pub(crate) mod overflow_based {
     pub(crate) impl TSaturatingAdd<
-        T, +Drop<T>, +core::num::traits::OverflowingAdd<T>, +core::integer::BoundedInt<T>
+        T, +Drop<T>, +core::num::traits::OverflowingAdd<T>, +core::num::traits::Bounded<T>
     > of core::num::traits::SaturatingAdd<T> {
         fn saturating_add(self: T, other: T) -> T {
             let (result, overflow) = self.overflowing_add(other);
             match overflow {
-                true => core::integer::BoundedInt::max(),
+                true => core::num::traits::Bounded::MAX,
                 false => result,
             }
         }
     }
 
     pub(crate) impl TSaturatingSub<
-        T, +Drop<T>, +core::num::traits::OverflowingSub<T>, +core::integer::BoundedInt<T>
+        T, +Drop<T>, +core::num::traits::OverflowingSub<T>, +core::num::traits::Bounded<T>
     > of core::num::traits::SaturatingSub<T> {
         fn saturating_sub(self: T, other: T) -> T {
             let (result, overflow) = self.overflowing_sub(other);
             match overflow {
-                true => core::integer::BoundedInt::min(),
+                true => core::num::traits::Bounded::MIN,
                 false => result,
             }
         }
     }
 
     pub(crate) impl TSaturatingMul<
-        T, +Drop<T>, +core::num::traits::OverflowingMul<T>, +core::integer::BoundedInt<T>
+        T, +Drop<T>, +core::num::traits::OverflowingMul<T>, +core::num::traits::Bounded<T>
     > of core::num::traits::SaturatingMul<T> {
         fn saturating_mul(self: T, other: T) -> T {
             let (result, overflow) = self.overflowing_mul(other);
             match overflow {
-                true => core::integer::BoundedInt::max(),
+                true => core::num::traits::Bounded::MAX,
                 false => result,
             }
         }