Add a sample for adding mixins to embind

2 files changed, 40 insertions, 0 deletions

diff --git a/tests/embind/embind.test.js b/tests/embind/embind.test.js
index 0976c597..a36c8b08 100644
--- a/tests/embind/embind.test.js
+++ b/tests/embind/embind.test.js
@@ -1916,6 +1916,15 @@ module({
             sh1.delete();
         });
     });
+
+    BaseFixture.extend("mixin", function() {
+        test("can call mixin method", function() {
+            var a = new cm.DerivedWithMixin();
+            assert.instanceof(a, cm.Base);
+            assert.equal(10, a.get10());
+            a.delete();
+        });
+    });
 });
 
 /* global run_all_tests */
diff --git a/tests/embind/embind_test.cpp b/tests/embind/embind_test.cpp
index 508fe052..4efc4bd8 100644
--- a/tests/embind/embind_test.cpp
+++ b/tests/embind/embind_test.cpp
@@ -2273,3 +2273,34 @@ EMSCRIPTEN_BINDINGS(return_values) {
     function("return_StringHolder_copy", &return_StringHolder_copy);
     function("call_StringHolder_func", &call_StringHolder_func);
 }
+
+
+struct Mixin {
+    int get10() const {
+        return 10;
+    }
+};
+
+template<typename ClassBinding>
+const ClassBinding& registerMixin(const ClassBinding& binding) {
+    // need a wrapper for implicit conversion from DerivedWithMixin to Mixin
+    struct Local {
+        static int get10(const typename ClassBinding::class_type& self) {
+            return self.get10();
+        }
+    };
+
+    return binding
+        .function("get10", &Local::get10)
+        ;
+}
+
+class DerivedWithMixin : public Base, public Mixin {
+};
+
+EMSCRIPTEN_BINDINGS(mixins) {
+    registerMixin(
+        class_<DerivedWithMixin, base<Base>>("DerivedWithMixin")
+            .constructor<>()
+    );
+}