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Side by Side Diff: mojo/public/cpp/bindings/lib/union_accessor.h

Issue 2250183003: Make the fuchsia mojo/public repo the source of truth. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 4 months ago
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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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