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Unified Diff: third_party/mojo/src/mojo/public/cpp/bindings/map.h

Issue 1410053006: Move third_party/mojo/src/mojo/public to mojo/public (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: merge Created 5 years, 1 month ago
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Index: third_party/mojo/src/mojo/public/cpp/bindings/map.h
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/map.h b/third_party/mojo/src/mojo/public/cpp/bindings/map.h
deleted file mode 100644
index c5a77f884f633467fe4e236f32a72b3d9a248b72..0000000000000000000000000000000000000000
--- a/third_party/mojo/src/mojo/public/cpp/bindings/map.h
+++ /dev/null
@@ -1,296 +0,0 @@
-// Copyright 2014 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 THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_BINDINGS_MAP_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_BINDINGS_MAP_H_
-
-#include <map>
-
-#include "third_party/mojo/src/mojo/public/cpp/bindings/lib/map_internal.h"
-#include "third_party/mojo/src/mojo/public/cpp/bindings/lib/value_traits.h"
-
-namespace mojo {
-
-// A move-only map that can handle move-only values. Map has the following
-// characteristics:
-// - The map itself can be null, and this is distinct from empty.
-// - Keys must not be move-only.
-// - The Key-type's "<" operator is used to sort the entries, and also is
-// used to determine equality of the key values.
-// - There can only be one entry per unique key.
-// - Values of move-only types will be moved into the Map when they are added
-// using the insert() method.
-template <typename Key, typename Value>
-class Map {
- MOJO_MOVE_ONLY_TYPE(Map)
-
- public:
- // Map keys cannot be move only classes.
- static_assert(!internal::IsMoveOnlyType<Key>::value,
- "Map keys cannot be move only types.");
-
- typedef internal::MapTraits<Key,
- Value,
- internal::IsMoveOnlyType<Value>::value> Traits;
- typedef typename Traits::KeyStorageType KeyStorageType;
- typedef typename Traits::KeyRefType KeyRefType;
- typedef typename Traits::KeyConstRefType KeyConstRefType;
- typedef typename Traits::KeyForwardType KeyForwardType;
-
- typedef typename Traits::ValueStorageType ValueStorageType;
- typedef typename Traits::ValueRefType ValueRefType;
- typedef typename Traits::ValueConstRefType ValueConstRefType;
- typedef typename Traits::ValueForwardType ValueForwardType;
-
- typedef internal::Map_Data<typename internal::WrapperTraits<Key>::DataType,
- typename internal::WrapperTraits<Value>::DataType>
- Data_;
-
- Map() : is_null_(true) {}
-
- // Constructs a non-null Map containing the specified |keys| mapped to the
- // corresponding |values|.
- Map(mojo::Array<Key> keys, mojo::Array<Value> values) : is_null_(false) {
- MOJO_DCHECK(keys.size() == values.size());
- Traits::InitializeFrom(&map_, keys.Pass(), values.Pass());
- }
-
- ~Map() { Traits::Finalize(&map_); }
-
- Map(Map&& other) : is_null_(true) { Take(&other); }
- Map& operator=(Map&& other) {
- Take(&other);
- return *this;
- }
-
- // Copies the contents of some other type of map into a new Map using a
- // TypeConverter. A TypeConverter for std::map to Map is defined below.
- template <typename U>
- static Map From(const U& other) {
- return TypeConverter<Map, U>::Convert(other);
- }
-
- // Copies the contents of the Map into some other type of map. A TypeConverter
- // for Map to std::map is defined below.
- template <typename U>
- U To() const {
- return TypeConverter<U, Map>::Convert(*this);
- }
-
- // Destroys the contents of the Map and leaves it in the null state.
- void reset() {
- if (!map_.empty()) {
- Traits::Finalize(&map_);
- map_.clear();
- }
- is_null_ = true;
- }
-
- bool is_null() const { return is_null_; }
-
- // Indicates the number of keys in the map.
- size_t size() const { return map_.size(); }
-
- void mark_non_null() { is_null_ = false; }
-
- // Inserts a key-value pair into the map, moving the value by calling its
- // Pass() method if it is a move-only type. Like std::map, this does not
- // insert |value| if |key| is already a member of the map.
- void insert(KeyForwardType key, ValueForwardType value) {
- is_null_ = false;
- Traits::Insert(&map_, key, value);
- }
-
- // Returns a reference to the value associated with the specified key,
- // crashing the process if the key is not present in the map.
- ValueRefType at(KeyForwardType key) { return Traits::at(&map_, key); }
- ValueConstRefType at(KeyForwardType key) const {
- return Traits::at(&map_, key);
- }
-
- // Returns a reference to the value associated with the specified key,
- // creating a new entry if the key is not already present in the map. A
- // newly-created value will be value-initialized (meaning that it will be
- // initialized by the default constructor of the value type, if any, or else
- // will be zero-initialized).
- ValueRefType operator[](KeyForwardType key) {
- is_null_ = false;
- return Traits::GetOrInsert(&map_, key);
- }
-
- // Swaps the contents of this Map with another Map of the same type (including
- // nullness).
- void Swap(Map<Key, Value>* other) {
- std::swap(is_null_, other->is_null_);
- map_.swap(other->map_);
- }
-
- // Swaps the contents of this Map with an std::map containing keys and values
- // of the same type. Since std::map cannot represent the null state, the
- // std::map will be empty if Map is null. The Map will always be left in a
- // non-null state.
- void Swap(std::map<Key, Value>* other) {
- is_null_ = false;
- map_.swap(*other);
- }
-
- // Removes all contents from the Map and places them into parallel key/value
- // arrays. Each key will be copied from the source to the destination, and
- // values will be copied unless their type is designated move-only, in which
- // case they will be passed by calling their Pass() method. Either way, the
- // Map will be left in a null state.
- void DecomposeMapTo(mojo::Array<Key>* keys, mojo::Array<Value>* values) {
- Traits::Decompose(&map_, keys, values);
- Traits::Finalize(&map_);
- map_.clear();
- is_null_ = true;
- }
-
- // Returns a new Map that contains a copy of the contents of this map. If the
- // values are of a type that is designated move-only, they will be cloned
- // using the Clone() method of the type. Please note that calling this method
- // will fail compilation if the value type cannot be cloned (which usually
- // means that it is a Mojo handle type or a type that contains Mojo handles).
- Map Clone() const {
- Map result;
- result.is_null_ = is_null_;
- Traits::Clone(map_, &result.map_);
- return result.Pass();
- }
-
- // Indicates whether the contents of this map are equal to those of another
- // Map (including nullness). Keys are compared by the != operator. Values are
- // compared as follows:
- // - Map, Array, Struct, or StructPtr values are compared by their Equals()
- // method.
- // - ScopedHandleBase-derived types are compared by their handles.
- // - Values of other types are compared by their "==" operator.
- bool Equals(const Map& other) const {
- if (is_null() != other.is_null())
- return false;
- if (size() != other.size())
- return false;
- auto i = begin();
- auto j = other.begin();
- while (i != end()) {
- if (i.GetKey() != j.GetKey())
- return false;
- if (!internal::ValueTraits<Value>::Equals(i.GetValue(), j.GetValue()))
- return false;
- ++i;
- ++j;
- }
- return true;
- }
-
- // A read-only iterator for Map.
- class ConstMapIterator {
- public:
- ConstMapIterator(
- const typename std::map<KeyStorageType,
- ValueStorageType>::const_iterator& it)
- : it_(it) {}
-
- // Returns a const reference to the key and value.
- KeyConstRefType GetKey() { return Traits::GetKey(it_); }
- ValueConstRefType GetValue() { return Traits::GetValue(it_); }
-
- ConstMapIterator& operator*() {
- return *this;
- }
- ConstMapIterator& operator++() {
- it_++;
- return *this;
- }
- bool operator!=(const ConstMapIterator& rhs) const {
- return it_ != rhs.it_;
- }
- bool operator==(const ConstMapIterator& rhs) const {
- return it_ == rhs.it_;
- }
-
- private:
- typename std::map<KeyStorageType, ValueStorageType>::const_iterator it_;
- };
-
- // Provide read-only iteration over map members in a way similar to STL
- // collections.
- ConstMapIterator begin() const { return ConstMapIterator(map_.begin()); }
- ConstMapIterator end() const { return ConstMapIterator(map_.end()); }
-
- // Returns the iterator pointing to the entry for |key|, if present, or else
- // returns end().
- ConstMapIterator find(KeyForwardType key) const {
- return ConstMapIterator(map_.find(key));
- }
-
- private:
- typedef std::map<KeyStorageType, ValueStorageType> Map::*Testable;
-
- public:
- // The Map may be used in boolean expressions to determine if it is non-null,
- // but is not implicitly convertible to an actual bool value (which would be
- // dangerous).
- operator Testable() const { return is_null_ ? 0 : &Map::map_; }
-
- private:
- // Forbid the == and != operators explicitly, otherwise Map will be converted
- // to Testable to do == or != comparison.
- template <typename T, typename U>
- bool operator==(const Map<T, U>& other) const = delete;
- template <typename T, typename U>
- bool operator!=(const Map<T, U>& other) const = delete;
-
- void Take(Map* other) {
- reset();
- Swap(other);
- }
-
- std::map<KeyStorageType, ValueStorageType> map_;
- bool is_null_;
-};
-
-// Copies the contents of an std::map to a new Map, optionally changing the
-// types of the keys and values along the way using TypeConverter.
-template <typename MojoKey,
- typename MojoValue,
- typename STLKey,
- typename STLValue>
-struct TypeConverter<Map<MojoKey, MojoValue>, std::map<STLKey, STLValue>> {
- static Map<MojoKey, MojoValue> Convert(
- const std::map<STLKey, STLValue>& input) {
- Map<MojoKey, MojoValue> result;
- result.mark_non_null();
- for (auto& pair : input) {
- result.insert(TypeConverter<MojoKey, STLKey>::Convert(pair.first),
- TypeConverter<MojoValue, STLValue>::Convert(pair.second));
- }
- return result.Pass();
- }
-};
-
-// Copies the contents of a Map to an std::map, optionally changing the types of
-// the keys and values along the way using TypeConverter.
-template <typename MojoKey,
- typename MojoValue,
- typename STLKey,
- typename STLValue>
-struct TypeConverter<std::map<STLKey, STLValue>, Map<MojoKey, MojoValue>> {
- static std::map<STLKey, STLValue> Convert(
- const Map<MojoKey, MojoValue>& input) {
- std::map<STLKey, STLValue> result;
- if (!input.is_null()) {
- for (auto it = input.begin(); it != input.end(); ++it) {
- result.insert(std::make_pair(
- TypeConverter<STLKey, MojoKey>::Convert(it.GetKey()),
- TypeConverter<STLValue, MojoValue>::Convert(it.GetValue())));
- }
- }
- return result;
- }
-};
-
-} // namespace mojo
-
-#endif // THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_BINDINGS_MAP_H_

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