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
bool {{class_name}}::Validate(
    const void* data,
    mojo::internal::ValidationContext* validation_context,
    bool inlined) {
  if (!data) {
    DCHECK(!inlined);
    return true;
  }

  // If it is inlined, the alignment is already enforced by its enclosing
  // object. We don't have to validate that.
  DCHECK(!inlined || mojo::internal::IsAligned(data));

  if (!inlined &&
      !mojo::internal::ValidateNonInlinedUnionHeaderAndClaimMemory(
          data, validation_context)) {
    return false;
  }

  const {{class_name}}* object = static_cast<const {{class_name}}*>(data);
  ALLOW_UNUSED_LOCAL(object);

  if (inlined && object->is_null())
    return true;

  switch (object->tag) {
{%  for field in union.fields %}
    case {{enum_name}}::{{field.name|upper}}: {
{%-   set field_expr = "object->data.f_" ~ field.name %}
{{validation_macros.validate_field(field, field_expr, union.name, false)|indent(4)}}
      return true;
    }
{%- endfor %}
    default: {
      ReportValidationError(
          validation_context,
          mojo::internal::VALIDATION_ERROR_UNKNOWN_UNION_TAG,
          "unknown tag in {{union.name}}");
      return false;
    }
  }
}