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34 lines
1011 B
C++
34 lines
1011 B
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_
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namespace mojo {
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namespace internal {
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// When serializing and deserializing Unions, it is necessary to access
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// the private fields and methods of the Union. This allows us to do that
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// without leaking those same fields and methods in the Union interface.
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// All Union wrappers are friends of this class allowing such access.
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template <typename U>
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class UnionAccessor {
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public:
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explicit UnionAccessor(U* u) : u_(u) {}
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typename U::Union_* data() { return &(u_->data_); }
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typename U::Tag* tag() { return &(u_->tag_); }
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void SwitchActive(typename U::Tag new_tag) { u_->SwitchActive(new_tag); }
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private:
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U* u_;
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};
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} // namespace internal
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_UNION_ACCESSOR_H_
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