Pass Reference of External Call Context

x/programs/rust/examples/counter-external/src/lib.rs

@@ -2,14 +2,14 @@ use wasmlanche_sdk::{public, types::Address, Context, ExternalCallContext, Progr
 
 #[public]
 pub fn inc(_: Context, external: Program, address: Address) {
-    let ctx = ExternalCallContext::new(external, 1_000_000, 0);
-    counter::inc(ctx, address, 1);
+    let ctx = ExternalCallContext::new(&external, 1_000_000, 0);
+    counter::inc(&ctx, address, 1);
 }
 
 #[public]
 pub fn get_value(_: Context, external: Program, address: Address) -> u64 {
-    let ctx = ExternalCallContext::new(external, 1_000_000, 0);
-    counter::get_value(ctx, address)
+    let ctx = ExternalCallContext::new(&external, 1_000_000, 0);
+    counter::get_value(&ctx, address)
 }
 
 #[cfg(test)]

x/programs/rust/sdk-macros/src/lib.rs

@@ -140,7 +140,7 @@ pub fn public(_: TokenStream, item: TokenStream) -> TokenStream {
         move |mut arg| {
             if first {
                 first = false;
-                arg.ty = Box::new(parse_quote!(wasmlanche_sdk::ExternalCallContext));
+                arg.ty = Box::new(parse_quote!(&wasmlanche_sdk::ExternalCallContext));
             }
 
             FnArg::Typed(arg)

x/programs/rust/wasmlanche-sdk/src/lib.rs

@@ -91,29 +91,32 @@ impl<K> BorshDeserialize for Context<K> {
 }
 
 /// Special context that is passed to external programs.
-pub struct ExternalCallContext {
-    program: Program,
+pub struct ExternalCallContext<'a> {
+    program: &'a Program,
     max_units: Gas,
     value: u64,
 }
 
-impl ExternalCallContext {
-    pub fn new(program: Program, max_units: Gas, value: u64) -> Self {
+impl<'a> ExternalCallContext<'a> {
+    pub fn new(program: &'a Program, max_units: Gas, value: u64) -> Self {
         Self {
             program,
             max_units,
             value,
         }
     }
 
+    #[must_use]
     pub fn program(&self) -> &Program {
-        &self.program
+        self.program
     }
 
+    #[must_use]
     pub fn max_units(&self) -> Gas {
         self.max_units
     }
 
+    #[must_use]
     pub fn value(&self) -> u64 {
         self.value
     }