Merge pull request #441 from str4d/memuse-0.2

`impl memuse::DynamicUsage for Amount`

zcash_primitives/CHANGELOG.md

@@ -51,6 +51,8 @@ and this library adheres to Rust's notion of
     data, as described above.
 - `zcash_primitives::serialize` has been factored out as a new `zcash_encoding`
   crate, which can be found in the `components` directory.
+- `zcash_primitives::transaction::components::Amount` now implements
+  `memuse::DynamicUsage`, to enable `orchard::Bundle<_, Amount>::dynamic_usage`.
 
 ### Changed
 - MSRV is now 1.51.0.

zcash_primitives/Cargo.toml

@@ -33,6 +33,7 @@ incrementalmerkletree = "0.1"
 jubjub = "0.8"
 lazy_static = "1"
 log = "0.4"
+memuse = "0.2"
 nonempty = "0.7"
 orchard = "0.0"
 pasta_curves = "0.2"

zcash_primitives/src/transaction/components/amount.rs

@@ -23,6 +23,18 @@ pub const DEFAULT_FEE: Amount = Amount(1000);
 #[derive(Clone, Copy, Debug, PartialEq, PartialOrd, Eq, Ord)]
 pub struct Amount(i64);
 
+impl memuse::DynamicUsage for Amount {
+    #[inline(always)]
+    fn dynamic_usage(&self) -> usize {
+        0
+    }
+
+    #[inline(always)]
+    fn dynamic_usage_bounds(&self) -> (usize, Option<usize>) {
+        (0, Some(0))
+    }
+}
+
 impl Amount {
     /// Returns a zero-valued Amount.
     pub const fn zero() -> Self {