Array and map members for unions.

mojo/public/tools/bindings/generators/cpp_templates/union_definition.tmpl

 {%- import "validation_macros.tmpl" as validation_macros %}
 {%- set class_name = union.name ~ "_Data" %}
 {%- set enum_name = union.name ~ "_Tag" -%}
 
 // static
 {{class_name}}* {{class_name}}::New(mojo::internal::Buffer* buf) {
   return new (buf->Allocate(sizeof({{class_name}}))) {{class_name}}();
 }
 
 // static
@@ skipping 39 matching lines @@
   size = 0U;
   tag = static_cast<{{enum_name}}>(0);
   data.unknown = 0U;
 }
 
 {{class_name}}::{{class_name}}() {
 }
 
 void {{class_name}}::EncodePointersAndHandles(
     std::vector<mojo::Handle>* handles) {
-  // TODO(azani): Implement pointers and handles.
+  switch (tag) {
+{%- for field in union.fields %}
+    case {{enum_name}}::{{field.name|upper}}: {
+{%-   if field.kind|is_object_kind and not field.kind|is_union_kind %}
+      mojo::internal::Encode(
+          reinterpret_cast<{{field.kind|cpp_field_type}}*>(&data),

[yzshen1, 2015/04/21 07:25:22]

is it better to use &data.f_{{field.name}} instead of &data?

[azani, 2015/04/21 17:43:33]

Maybe it's a bit more readable if we include the field name.

+          handles);
+{%-   elif field.kind|is_any_handle_kind %}
+  mojo::internal::EncodeHandle(&data.f_{{field.name}}, handles);

[yzshen1, 2015/04/21 07:25:23]

wrong indent.

[azani, 2015/04/21 17:43:33]

Done.

+{%-   endif %}
+      return;
+    }
+{%- endfor %}
+  }
 }
 
 void {{class_name}}::DecodePointersAndHandles(
     std::vector<mojo::Handle>* handles) {
-  // TODO(azani): Implement pointers and handles.
+  switch (tag) {
+{%- for field in union.fields %}
+    case {{enum_name}}::{{field.name|upper}}: {
+{%-   if field.kind|is_object_kind and not field.kind|is_union_kind %}
+      mojo::internal::Decode(
+          reinterpret_cast<{{field.kind|cpp_field_type}}*>(&data),

[yzshen1, 2015/04/21 07:25:22]

is it better to use &data.f_{{field.name}} instead of &data?

[azani, 2015/04/21 17:43:33]

Done.

+          handles);
+{%-   elif field.kind|is_any_handle_kind %}
+      mojo::internal::DecodeHandle(&data.f_{{field.name}}, handles);
+{%-   endif %}
+      return;
+    }
+{%- endfor %}
+  }
 }