blob: 821aede5953c3715199d791c266b984331fd3b22 [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace mojo {
namespace internal {
// When serializing and deserializing Unions, it is necessary to access
// the private fields and methods of the Union. This allows us to do that
// without leaking those same fields and methods in the Union interface.
// All Union wrappers are friends of this class allowing such access.
template <typename U>
class UnionAccessor {
explicit UnionAccessor(U* u) : u_(u) {}
typename U::Union_* data() { return &(u_->data_); }
typename U::Tag* tag() { return &(u_->tag_); }
void SwitchActive(typename U::Tag new_tag) { u_->SwitchActive(new_tag); }
U* u_;
} // namespace internal
} // namespace mojo