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