128 lines
3.9 KiB
C++
128 lines
3.9 KiB
C++
// 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_ARRAY_TRAITS_STL_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STL_H_
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#include <map>
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#include <set>
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#include <vector>
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#include "mojo/public/cpp/bindings/array_traits.h"
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namespace mojo {
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template <typename T>
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struct ArrayTraits<std::vector<T>> {
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using Element = T;
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static bool IsNull(const std::vector<T>& input) {
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// std::vector<> is always converted to non-null mojom array.
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return false;
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}
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static void SetToNull(std::vector<T>* output) {
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// std::vector<> doesn't support null state. Set it to empty instead.
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output->clear();
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}
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static size_t GetSize(const std::vector<T>& input) { return input.size(); }
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static T* GetData(std::vector<T>& input) { return input.data(); }
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static const T* GetData(const std::vector<T>& input) { return input.data(); }
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static typename std::vector<T>::reference GetAt(std::vector<T>& input,
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size_t index) {
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return input[index];
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}
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static typename std::vector<T>::const_reference GetAt(
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const std::vector<T>& input,
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size_t index) {
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return input[index];
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}
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static inline bool Resize(std::vector<T>& input, size_t size) {
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// Instead of calling std::vector<T>::resize() directly, this is a hack to
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// make compilers happy. Some compilers (e.g., Mac, Android, Linux MSan)
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// currently don't allow resizing types like
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// std::vector<std::vector<MoveOnlyType>>.
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// Because the deserialization code doesn't care about the original contents
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// of |input|, we discard them directly.
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//
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// The "inline" keyword of this method matters. Without it, we have observed
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// significant perf regression with some tests on Mac. crbug.com/631415
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if (input.size() != size) {
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std::vector<T> temp(size);
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input.swap(temp);
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}
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return true;
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}
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};
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// This ArrayTraits specialization is used only for serialization.
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template <typename T>
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struct ArrayTraits<std::set<T>> {
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using Element = T;
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using ConstIterator = typename std::set<T>::const_iterator;
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static bool IsNull(const std::set<T>& input) {
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// std::set<> is always converted to non-null mojom array.
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return false;
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}
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static size_t GetSize(const std::set<T>& input) { return input.size(); }
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static ConstIterator GetBegin(const std::set<T>& input) {
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return input.begin();
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}
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static void AdvanceIterator(ConstIterator& iterator) {
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++iterator;
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}
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static const T& GetValue(ConstIterator& iterator) {
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return *iterator;
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}
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};
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template <typename K, typename V>
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struct MapValuesArrayView {
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explicit MapValuesArrayView(const std::map<K, V>& map) : map(map) {}
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const std::map<K, V>& map;
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};
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// Convenience function to create a MapValuesArrayView<> that infers the
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// template arguments from its argument type.
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template <typename K, typename V>
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MapValuesArrayView<K, V> MapValuesToArray(const std::map<K, V>& map) {
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return MapValuesArrayView<K, V>(map);
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}
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// This ArrayTraits specialization is used only for serialization and converts
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// a map<K, V> into an array<V>, discarding the keys.
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template <typename K, typename V>
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struct ArrayTraits<MapValuesArrayView<K, V>> {
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using Element = V;
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using ConstIterator = typename std::map<K, V>::const_iterator;
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static bool IsNull(const MapValuesArrayView<K, V>& input) {
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// std::map<> is always converted to non-null mojom array.
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return false;
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}
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static size_t GetSize(const MapValuesArrayView<K, V>& input) {
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return input.map.size();
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}
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static ConstIterator GetBegin(const MapValuesArrayView<K, V>& input) {
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return input.map.begin();
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}
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static void AdvanceIterator(ConstIterator& iterator) { ++iterator; }
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static const V& GetValue(ConstIterator& iterator) { return iterator->second; }
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};
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STL_H_
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