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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STL_H_
#define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STL_H_
#include <map>
#include <set>
#include <vector>
#include "mojo/public/cpp/bindings/array_traits.h"
namespace mojo {
template <typename T>
struct ArrayTraits<std::vector<T>> {
using Element = T;
static bool IsNull(const std::vector<T>& input) {
// std::vector<> is always converted to non-null mojom array.
return false;
}
static void SetToNull(std::vector<T>* output) {
// std::vector<> doesn't support null state. Set it to empty instead.
output->clear();
}
static size_t GetSize(const std::vector<T>& input) { return input.size(); }
static T* GetData(std::vector<T>& input) { return input.data(); }
static const T* GetData(const std::vector<T>& input) { return input.data(); }
static typename std::vector<T>::reference GetAt(std::vector<T>& input,
size_t index) {
return input[index];
}
static typename std::vector<T>::const_reference GetAt(
const std::vector<T>& input,
size_t index) {
return input[index];
}
static inline bool Resize(std::vector<T>& input, size_t size) {
// Instead of calling std::vector<T>::resize() directly, this is a hack to
// make compilers happy. Some compilers (e.g., Mac, Android, Linux MSan)
// currently don't allow resizing types like
// std::vector<std::vector<MoveOnlyType>>.
// Because the deserialization code doesn't care about the original contents
// of |input|, we discard them directly.
//
// The "inline" keyword of this method matters. Without it, we have observed
// significant perf regression with some tests on Mac. crbug.com/631415
if (input.size() != size) {
std::vector<T> temp(size);
input.swap(temp);
}
return true;
}
};
// This ArrayTraits specialization is used only for serialization.
template <typename T>
struct ArrayTraits<std::set<T>> {
using Element = T;
using ConstIterator = typename std::set<T>::const_iterator;
static bool IsNull(const std::set<T>& input) {
// std::set<> is always converted to non-null mojom array.
return false;
}
static size_t GetSize(const std::set<T>& input) { return input.size(); }
static ConstIterator GetBegin(const std::set<T>& input) {
return input.begin();
}
static void AdvanceIterator(ConstIterator& iterator) {
++iterator;
}
static const T& GetValue(ConstIterator& iterator) {
return *iterator;
}
};
template <typename K, typename V>
struct MapValuesArrayView {
explicit MapValuesArrayView(const std::map<K, V>& map) : map(map) {}
const std::map<K, V>& map;
};
// Convenience function to create a MapValuesArrayView<> that infers the
// template arguments from its argument type.
template <typename K, typename V>
MapValuesArrayView<K, V> MapValuesToArray(const std::map<K, V>& map) {
return MapValuesArrayView<K, V>(map);
}
// This ArrayTraits specialization is used only for serialization and converts
// a map<K, V> into an array<V>, discarding the keys.
template <typename K, typename V>
struct ArrayTraits<MapValuesArrayView<K, V>> {
using Element = V;
using ConstIterator = typename std::map<K, V>::const_iterator;
static bool IsNull(const MapValuesArrayView<K, V>& input) {
// std::map<> is always converted to non-null mojom array.
return false;
}
static size_t GetSize(const MapValuesArrayView<K, V>& input) {
return input.map.size();
}
static ConstIterator GetBegin(const MapValuesArrayView<K, V>& input) {
return input.map.begin();
}
static void AdvanceIterator(ConstIterator& iterator) { ++iterator; }
static const V& GetValue(ConstIterator& iterator) { return iterator->second; }
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_TRAITS_STL_H_
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