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65 lines
2.4 KiB
65 lines
2.4 KiB
// Copyright 2016 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_MAP_TRAITS_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_H_
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#include "mojo/public/cpp/bindings/lib/template_util.h"
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namespace mojo {
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// This must be specialized for any type |T| to be serialized/deserialized as
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// a mojom map.
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//
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// Usually you would like to do a partial specialization for a map template.
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// Imagine you want to specialize it for CustomMap<>, you need to implement:
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//
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// template <typename K, typename V>
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// struct MapTraits<CustomMap<K, V>> {
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// using Key = K;
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// using Value = V;
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//
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// // These two methods are optional. Please see comments in struct_traits.h
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// // Note that unlike with StructTraits, IsNull() is called *twice* during
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// // serialization for MapTraits.
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// static bool IsNull(const CustomMap<K, V>& input);
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// static void SetToNull(CustomMap<K, V>* output);
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//
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// static size_t GetSize(const CustomMap<K, V>& input);
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//
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// static CustomConstIterator GetBegin(const CustomMap<K, V>& input);
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// static CustomIterator GetBegin(CustomMap<K, V>& input);
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//
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// static void AdvanceIterator(CustomConstIterator& iterator);
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// static void AdvanceIterator(CustomIterator& iterator);
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//
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// static const K& GetKey(CustomIterator& iterator);
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// static const K& GetKey(CustomConstIterator& iterator);
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//
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// static V& GetValue(CustomIterator& iterator);
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// static const V& GetValue(CustomConstIterator& iterator);
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//
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// // Returning false results in deserialization failure and causes the
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// // message pipe receiving it to be disconnected. |IK| and |IV| are
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// // separate input key/value template parameters that allows for the
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// // the key/value types to be forwarded.
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// template <typename IK, typename IV>
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// static bool Insert(CustomMap<K, V>& input,
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// IK&& key,
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// IV&& value);
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//
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// static void SetToEmpty(CustomMap<K, V>* output);
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// };
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//
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template <typename T>
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struct MapTraits {
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static_assert(internal::AlwaysFalse<T>::value,
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"Cannot find the mojo::MapTraits specialization. Did you "
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"forget to include the corresponding header file?");
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};
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_H_
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