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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_ | |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_ | |
| 7 | |
| 8 namespace mojo { | |
| 9 namespace internal { | |
| 10 | |
| 11 // When serializing and deserializing Unions, it is necessary to access | |
| 12 // the private fields and methods of the Union. This allows us to do that | |
| 13 // without leaking those same fields and methods in the Union interface. | |
| 14 // All Union wrappers are friends of this class allowing such access. | |
| 15 template <typename U> | |
| 16 class UnionAccessor { | |
| 17 public: | |
| 18 explicit UnionAccessor(U* u) : u_(u) {} | |
| 19 | |
| 20 typename U::Union_* data() { return &(u_->data_); } | |
| 21 | |
| 22 typename U::Tag* tag() { return &(u_->tag_); } | |
| 23 | |
| 24 void SwitchActive(typename U::Tag new_tag) { u_->SwitchActive(new_tag); } | |
| 25 | |
| 26 private: | |
| 27 U* u_; | |
| 28 }; | |
| 29 | |
| 30 } // namespace internal | |
| 31 } // namespace mojo | |
| 32 | |
| 33 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_ | |
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