Mojo C++ bindings: expose public <struct>DataView and StringDataView.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/struct_data_view_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/struct_data_view_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/struct_data_view_definition.tmpl
new file mode 100644
index 0000000000000000000000000000000000000000..ecea7e9ad9da7dfb6f020cb6179cb8a037921edf
--- /dev/null
+++ b/mojo/public/tools/bindings/generators/cpp_templates/struct_data_view_definition.tmpl
@@ -0,0 +1,120 @@
+{{struct.name}}DataView::{{struct.name}}DataView(
+    internal::{{struct.name}}_Data*  data,
+    mojo::internal::SerializationContext* context)
+    : data_(data), context_(context) {}
+
+{%- for pf in struct.packed.packed_fields_in_ordinal_order %}
+{%-   set kind = pf.field.kind -%}
+{%-   set name = pf.field.name -%}
+{%-   if kind|is_struct_kind or kind|is_array_kind or kind|is_string_kind %}
+{#-     Does nothing. They are already defined in the class declaration. #}
+{%-   elif kind|is_map_kind %}
+bool {{struct.name}}DataView::Read{{name|under_to_camel}}(
+    {{kind|cpp_wrapper_type}}* value) {
+  DCHECK(!is_null());
+{%-     if pf.min_version != 0 %}
+    auto pointer = data_->header_.version >= {{pf.min_version}}
+                   ? data_->{{name}}.ptr : nullptr;
+{%-     else %}
+    auto pointer = data_->{{name}}.ptr;
+{%-     endif %}
+  return mojo::internal::Deserialize<{{kind|unmapped_type_for_serializer}}>(
+      pointer, value, context_);
+}
+
+{%-   elif kind|is_union_kind %}
+bool {{struct.name}}DataView::Read{{name|under_to_camel}}(
+    {{kind|cpp_wrapper_type}}* value) {
+  DCHECK(!is_null());
+{%-     if pf.min_version != 0 %}
+    auto pointer = data_->header_.version >= {{pf.min_version}}
+                   ? &data_->{{name}} : nullptr;
+{%-     else %}
+    auto pointer = &data_->{{name}};
+{%-     endif %}
+  return mojo::internal::Deserialize<{{kind|unmapped_type_for_serializer}}>(
+      pointer, value, context_);
+}
+
+{%-   elif kind|is_interface_kind %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::Take{{name|under_to_camel}}() {
+  DCHECK(!is_null());
+
+  {{kind|cpp_wrapper_type}} result;
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return result;
+{%-     endif %}
+  mojo::internal::InterfaceDataToPointer(&data_->{{name}}, &result, context_);
+  return result;
+}
+
+{%-   elif kind|is_interface_request_kind %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::Take{{name|under_to_camel}}() {
+  DCHECK(!is_null());
+
+  {{kind|cpp_wrapper_type}} result;
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return result;
+{%-     endif %}
+  result.Bind(context_->handles.TakeHandleAs<mojo::MessagePipeHandle>(
+      data_->{{name}}));
+  return result;
+}
+
+{%-   elif kind|is_any_handle_kind %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::Take{{name|under_to_camel}}() {
+  DCHECK(!is_null());
+
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return {{kind|cpp_wrapper_type}}();
+{%-     endif %}
+
+  return context_->handles.TakeHandleAs<
+      {{kind|cpp_wrapper_type}}::RawHandleType>(data_->{{name}});
+}
+
+{%-   elif kind|is_associated_interface_kind %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::Take{{name|under_to_camel}}() {
+  DCHECK(!is_null());
+
+  {{kind|cpp_wrapper_type}} result;
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return result;
+{%-     endif %}
+  mojo::internal::AssociatedInterfaceDataToPtrInfo(&data_->{{name}}, &result,
+                                                   context_->router.get());
+  return result;
+}
+
+{%-   elif kind|is_associated_interface_request_kind %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::Take{{name|under_to_camel}}() {
+  DCHECK(!is_null());
+
+  {{kind|cpp_wrapper_type}} result;
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return result;
+{%-     endif %}
+  mojo::internal::AssociatedInterfaceRequestHelper::SetHandle(
+      &result,
+      context_->router->CreateLocalEndpointHandle(
+          mojo::internal::FetchAndReset(&data_->{{name}})));
+  return result;
+}
+
+{%-   else %}
+{{kind|cpp_wrapper_type}} {{struct.name}}DataView::{{name}}() const {
+  DCHECK(!is_null());
+{%-     if pf.min_version != 0 %}
+  if (data_->header_.version < {{pf.min_version}})
+    return {{kind|cpp_wrapper_type}}{};
+{%-     endif %}
+  return static_cast<{{kind|cpp_wrapper_type}}>(data_->{{name}});
+}
+{%-   endif %}
+{%- endfor %}
+