add checked math wrapper

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/math.rs

@@ -1,10 +1,11 @@
 mod expected;
+mod tried;
 
 use std::{cmp, convert::TryFrom};
 
 pub use checked_ops::checked_ops;
 
-pub use self::expected::Expected;
+pub use self::{expected::Expected, tried::Tried};
 use crate::{debug::type_name, err, Err, Error, Result};
 
 /// Checked arithmetic expression. Returns a Result<R, Error::Arithmetic>

src/core/utils/math/tried.rs

@@ -0,0 +1,47 @@
+use num_traits::ops::checked::{CheckedAdd, CheckedDiv, CheckedMul, CheckedRem, CheckedSub};
+
+use crate::{checked, Result};
+
+pub trait Tried {
+	#[inline]
+	fn try_add(self, rhs: Self) -> Result<Self>
+	where
+		Self: CheckedAdd + Sized,
+	{
+		checked!(self + rhs)
+	}
+
+	#[inline]
+	fn try_sub(self, rhs: Self) -> Result<Self>
+	where
+		Self: CheckedSub + Sized,
+	{
+		checked!(self - rhs)
+	}
+
+	#[inline]
+	fn try_mul(self, rhs: Self) -> Result<Self>
+	where
+		Self: CheckedMul + Sized,
+	{
+		checked!(self * rhs)
+	}
+
+	#[inline]
+	fn try_div(self, rhs: Self) -> Result<Self>
+	where
+		Self: CheckedDiv + Sized,
+	{
+		checked!(self / rhs)
+	}
+
+	#[inline]
+	fn try_rem(self, rhs: Self) -> Result<Self>
+	where
+		Self: CheckedRem + Sized,
+	{
+		checked!(self % rhs)
+	}
+}
+
+impl<T> Tried for T {}