Merge pull request #342 from ethereum/rust-bindgen

rust: support ParitalEq, Default, Hash on certain ffi types

bindings/rust/evmc-sys/build.rs

@@ -20,6 +20,8 @@ fn gen_bindings() {
         .constified_enum("")
         // generate Rust enums for each evmc enum
         .rustified_enum("*")
+        // force deriving the Hash trait on basic types (address, bytes32)
+        .derive_hash(true)
         .generate()
         .expect("Unable to generate bindings");
 

bindings/rust/evmc-sys/src/lib.rs

@@ -8,3 +8,30 @@
 #![allow(non_snake_case)]
 
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+// TODO: with bindgen's interface improving these may be moved to
+// bindgen configuration
+
+impl PartialEq for evmc_address {
+    fn eq(&self, other: &Self) -> bool {
+        self.bytes == other.bytes
+    }
+}
+
+impl PartialEq for evmc_bytes32 {
+    fn eq(&self, other: &Self) -> bool {
+        self.bytes == other.bytes
+    }
+}
+
+impl Default for evmc_address {
+    fn default() -> Self {
+        evmc_address { bytes: [0u8; 20] }
+    }
+}
+
+impl Default for evmc_bytes32 {
+    fn default() -> Self {
+        evmc_bytes32 { bytes: [0u8; 32] }
+    }
+}