Merge pull request #1 from SiaFoundation/chris/deref-currency

Implement deref, derefmut and asref for currency

src/currency.rs

@@ -1,4 +1,4 @@
-use core::ops::{Add, Sub, Mul, Div};
+use core::ops::{Add, Sub, Mul, Div, Deref, DerefMut};
 use core::num::ParseIntError;
 
 use crate::SiaEncodable;
@@ -12,6 +12,28 @@ const SIACOIN_PRECISION_U32: u32 = 24;
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub struct Currency(u128);
 
+// Implement Deref and DerefMut to be able to implicitly use Currency as a u128
+// This gives us all the traits that u128 already implements for free.
+impl Deref for Currency {
+	type Target = u128;
+	fn deref(&self) -> &u128 { &self.0 }
+}
+
+impl DerefMut for Currency {
+	fn deref_mut(&mut self) -> &mut u128 { &mut self.0 }
+}
+
+// Implement AsRef as well to be able to implicitly obtain a &u128 from a Currency as well.
+impl<T> AsRef<T> for Currency
+	where
+		T: ?Sized,
+		<Currency as Deref>::Target: AsRef<T>,
+{
+	fn as_ref(&self) -> &T {
+		self.deref().as_ref()
+	}
+}
+
 impl Currency {
 	pub fn new(value: u128) -> Self {
 		Currency(value)