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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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