1 // Copyright 2016 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_ENUM_TRAITS_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_ENUM_TRAITS_H_ 7 8 #include "mojo/public/cpp/bindings/lib/template_util.h" 9 10 namespace mojo { 11 12 // This must be specialized for any type |T| to be serialized/deserialized as a 13 // mojom enum |MojomType|. Each specialization needs to implement: 14 // 15 // template <> 16 // struct EnumTraits<MojomType, T> { 17 // static MojomType ToMojom(T input); 18 // 19 // // Returning false results in deserialization failure and causes the 20 // // message pipe receiving it to be disconnected. 21 // static bool FromMojom(MojomType input, T* output); 22 // }; 23 // 24 template <typename MojomType, typename T> 25 struct EnumTraits { 26 static_assert(internal::AlwaysFalse<T>::value, 27 "Cannot find the mojo::EnumTraits specialization. Did you " 28 "forget to include the corresponding header file?"); 29 }; 30 31 } // namespace mojo 32 33 #endif // MOJO_PUBLIC_CPP_BINDINGS_ENUM_TRAITS_H_ 34