Move substrate/serai/* to substrate/*

substrate/primitives/src/balance.rs

@@ -0,0 +1,40 @@
+use core::ops::{Add, Sub, Mul};
+
+#[cfg(feature = "std")]
+use zeroize::Zeroize;
+
+use scale::{Encode, Decode, MaxEncodedLen};
+use scale_info::TypeInfo;
+#[cfg(feature = "std")]
+use serde::{Serialize, Deserialize};
+
+use crate::{Coin, Amount};
+
+/// The type used for balances (a Coin and Balance).
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, Decode, MaxEncodedLen, TypeInfo)]
+#[cfg_attr(feature = "std", derive(Zeroize, Serialize, Deserialize))]
+pub struct Balance {
+  pub coin: Coin,
+  pub amount: Amount,
+}
+
+impl Add<Amount> for Balance {
+  type Output = Balance;
+  fn add(self, other: Amount) -> Balance {
+    Balance { coin: self.coin, amount: self.amount + other }
+  }
+}
+
+impl Sub<Amount> for Balance {
+  type Output = Balance;
+  fn sub(self, other: Amount) -> Balance {
+    Balance { coin: self.coin, amount: self.amount - other }
+  }
+}
+
+impl Mul<Amount> for Balance {
+  type Output = Balance;
+  fn mul(self, other: Amount) -> Balance {
+    Balance { coin: self.coin, amount: self.amount * other }
+  }
+}