Generalize support for struct fields

src/embind/embind.js

@@ -470,27 +470,32 @@ function __embind_register_struct(
 }
 
 function __embind_register_struct_field(
-    rawStructType,
+    structType,
     fieldName,
-    rawFieldType,
-    rawGetter,
-    rawSetter,
-    context
+    getterReturnType,
+    getter,
+    getterContext,
+    setterArgumentType,
+    setter,
+    setterContext
 ) {
-    var structType = requireRegisteredType(rawStructType, 'struct');
+    structType = requireRegisteredType(structType, 'struct');
     fieldName = Pointer_stringify(fieldName);
-    rawGetter = FUNCTION_TABLE[rawGetter];
-    rawSetter = FUNCTION_TABLE[rawSetter];
+    getter = FUNCTION_TABLE[getter];
+    setter = FUNCTION_TABLE[setter];
+
     // TODO: test incomplete registration of value structs
-    whenDependentTypesAreResolved([], [rawFieldType], function(fieldType) {
-        fieldType = fieldType[0];
+    whenDependentTypesAreResolved([], [getterReturnType, setterArgumentType], function(types) {
+        var getterReturnType = types[0];
+        var setterArgumentType = types[1];
         structType.fields[fieldName] = {
             read: function(ptr) {
-                return fieldType.fromWireType(rawGetter(context, ptr));
+                return getterReturnType.fromWireType(
+                    getter(getterContext, ptr));
             },
             write: function(ptr, o) {
                 var destructors = [];
-                rawSetter(context, ptr, fieldType.toWireType(destructors, o));
+                setter(setterContext, ptr, setterArgumentType.toWireType(destructors, o));
                 runDestructors(destructors);
             }
         };

system/include/emscripten/bind.h

@@ -71,25 +71,27 @@ namespace emscripten {
             void _embind_register_tuple_element(
                 TYPEID tupleType,
                 TYPEID getterReturnType,
-                GenericFunction staticGetter,
+                GenericFunction getter,
                 void* getterContext,
                 TYPEID setterArgumentType,
-                GenericFunction staticSetter,
+                GenericFunction setter,
                 void* setterContext);
 
             void _embind_register_struct(
                 TYPEID structType,
-                const char* name,
+                const char* fieldName,
                 GenericFunction constructor,
                 GenericFunction destructor);
             
             void _embind_register_struct_field(
                 TYPEID structType,
-                const char* name,
-                TYPEID fieldType,
+                const char* fieldName,
+                TYPEID getterReturnType,
                 GenericFunction getter,
+                void* getterContext,
+                TYPEID setterArgumentType,
                 GenericFunction setter,
-                void* context);
+                void* setterContext);
 
             void _embind_register_smart_ptr(
                 TYPEID pointerType,
@@ -462,11 +464,38 @@ namespace emscripten {
                 TypeID<ClassType>::get(),
                 fieldName,
                 TypeID<FieldType>::get(),
-                reinterpret_cast<GenericFunction>(&MemberAccess<ClassType, FieldType>::getWire),
-                reinterpret_cast<GenericFunction>(&MemberAccess<ClassType, FieldType>::setWire),
+                reinterpret_cast<GenericFunction>(
+                    &MemberAccess<ClassType, FieldType>::getWire),
+                getContext(field),
+                TypeID<FieldType>::get(),
+                reinterpret_cast<GenericFunction>(
+                    &MemberAccess<ClassType, FieldType>::setWire),
                 getContext(field));
             return *this;
         }
+    
+        template<typename GetterReturnType, typename SetterArgumentType>
+        value_struct& field(
+            const char* fieldName,
+            GetterReturnType (*getter)(const ClassType&),
+            void (*setter)(ClassType&, SetterArgumentType)
+        ) {
+            using namespace internal;
+            _embind_register_struct_field(
+                TypeID<ClassType>::get(),
+                fieldName,
+                TypeID<GetterReturnType>::get(),
+                reinterpret_cast<GenericFunction>(
+                    &MemberAccess<ClassType, GetterReturnType>
+                    ::template propertyGet<GetterReturnType(*)(const ClassType&)>),
+                getContext(getter),
+                TypeID<SetterArgumentType>::get(),
+                reinterpret_cast<GenericFunction>(
+                    &MemberAccess<ClassType, SetterArgumentType>
+                    ::template propertySet<void(*)(ClassType&, SetterArgumentType)>),
+                getContext(setter));
+            return *this;
+        }
     };
 
     ////////////////////////////////////////////////////////////////////////////////

tests/embind/embind_test.cpp

@@ -758,6 +758,14 @@ struct StructVector {
     float x, y, z;
 };
 
+float readStructVectorZ(const StructVector& v) {
+    return v.z;
+}
+
+void writeStructVectorZ(StructVector& v, float z) {
+    v.z = z;
+}
+
 StructVector emval_test_return_StructVector() {
     StructVector v;
     v.x = 1;
@@ -1354,7 +1362,7 @@ EMSCRIPTEN_BINDINGS(tests) {
     value_struct<StructVector>("StructVector")
         .field("x", &StructVector::x)
         .field("y", &StructVector::y)
-        .field("z", &StructVector::z)
+        .field("z", &readStructVectorZ, &writeStructVectorZ)
         ;
 
     function("emval_test_return_StructVector", &emval_test_return_StructVector);