Remove mojo::WTFArray.

mojo/public/cpp/bindings/wtf_array.h

-// 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_WTF_ARRAY_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
-
-#include <stddef.h>
-#include <utility>
-
-#include "base/macros.h"
-#include "mojo/public/cpp/bindings/lib/array_internal.h"
-#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
-#include "mojo/public/cpp/bindings/lib/template_util.h"
-#include "mojo/public/cpp/bindings/lib/wtf_clone_equals_util.h"
-#include "mojo/public/cpp/bindings/type_converter.h"
-#include "third_party/WebKit/Source/wtf/Vector.h"
-
-namespace mojo {
-
-// Represents an array backed by WTF::Vector. Comparing with WTF::Vector,
-// mojo::WTFArray is move-only and can be null.
-// It is easy to convert between WTF::Vector<T> and mojo::WTFArray<T>:
-//   - constructor WTFArray(WTF::Vector<T>&&) takes the contents of a
-//     WTF::Vector<T>;
-//   - method PassStorage() passes the underlying WTF::Vector.
-template <typename T>
-class WTFArray {
- public:
-  // Constructs an empty array.
-  WTFArray() : is_null_(false) {}
-  // Constructs a null array.
-  WTFArray(std::nullptr_t null_pointer) : is_null_(true) {}
-
-  // Constructs a new non-null array of the specified size. The elements will
-  // be value-initialized (meaning that they will be initialized by their
-  // default constructor, if any, or else zero-initialized).
-  explicit WTFArray(size_t size) : vec_(size), is_null_(false) {}
-  ~WTFArray() {}
-
-  // Moves the contents of |other| into this array.
-  WTFArray(WTF::Vector<T>&& other) : vec_(std::move(other)), is_null_(false) {}
-  WTFArray(WTFArray&& other) : is_null_(true) { Take(&other); }
-
-  WTFArray& operator=(WTF::Vector<T>&& other) {
-    vec_ = std::move(other);
-    is_null_ = false;
-    return *this;
-  }
-  WTFArray& operator=(WTFArray&& other) {
-    Take(&other);
-    return *this;
-  }
-
-  WTFArray& operator=(std::nullptr_t null_pointer) {
-    is_null_ = true;
-    vec_.clear();
-    return *this;
-  }
-
-  // Creates a non-null array of the specified size. The elements will be
-  // value-initialized (meaning that they will be initialized by their default
-  // constructor, if any, or else zero-initialized).
-  static WTFArray New(size_t size) { return WTFArray(size); }
-
-  // Creates a new array with a copy of the contents of |other|.
-  template <typename U>
-  static WTFArray From(const U& other) {
-    return TypeConverter<WTFArray, U>::Convert(other);
-  }
-
-  // Copies the contents of this array to a new object of type |U|.
-  template <typename U>
-  U To() const {
-    return TypeConverter<U, WTFArray>::Convert(*this);
-  }
-
-  // Indicates whether the array is null (which is distinct from empty).
-  bool is_null() const {
-    // When the array is set to null, the underlying storage |vec_| shouldn't
-    // contain any elements.
-    DCHECK(!is_null_ || vec_.isEmpty());
-    return is_null_;
-  }
-
-  // Indicates whether the array is empty (which is distinct from null).
-  bool empty() const { return vec_.isEmpty() && !is_null_; }
-
-  // Returns a reference to the first element of the array. Calling this on a
-  // null or empty array causes undefined behavior.
-  const T& front() const { return vec_.front(); }
-  T& front() { return vec_.front(); }
-
-  // Returns the size of the array, which will be zero if the array is null.
-  size_t size() const { return vec_.size(); }
-
-  // Returns a reference to the element at zero-based |offset|. Calling this on
-  // an array with size less than |offset|+1 causes undefined behavior.
-  const T& at(size_t offset) const { return vec_.at(offset); }
-  const T& operator[](size_t offset) const { return at(offset); }
-  T& at(size_t offset) { return vec_.at(offset); }
-  T& operator[](size_t offset) { return at(offset); }
-
-  // Resizes the array to |size| and makes it non-null. Otherwise, works just
-  // like the resize method of |WTF::Vector|.
-  void resize(size_t size) {
-    is_null_ = false;
-    vec_.resize(size);
-  }
-
-  // Sets the array to empty (even if previously it was null.)
-  void SetToEmpty() { resize(0); }
-
-  // Returns a const reference to the |WTF::Vector| managed by this class. If
-  // the array is null, this will be an empty vector.
-  const WTF::Vector<T>& storage() const { return vec_; }
-
-  // Passes the underlying storage and resets this array to null.
-  //
-  // TODO(yzshen): Consider changing this to a rvalue-ref-qualified conversion
-  // to WTF::Vector<T> after we move to MSVC 2015.
-  WTF::Vector<T> PassStorage() {
-    is_null_ = true;
-    return std::move(vec_);
-  }
-
-  void Swap(WTFArray* other) {
-    std::swap(is_null_, other->is_null_);
-    vec_.swap(other->vec_);
-  }
-
-  // Swaps the contents of this array with the specified vector, making this
-  // array non-null. Since the vector cannot represent null, it will just be
-  // made empty if this array is null.
-  void Swap(WTF::Vector<T>* other) {
-    is_null_ = false;
-    vec_.swap(*other);
-  }
-
-  // Returns a copy of the array where each value of the new array has been
-  // "cloned" from the corresponding value of this array. If the element type
-  // defines a Clone() method, it will be used; otherwise copy
-  // constructor/assignment will be used.
-  //
-  // Please note that calling this method will fail compilation if the element
-  // type cannot be cloned (which usually means that it is a Mojo handle type or
-  // a type containing Mojo handles).
-  WTFArray Clone() const {
-    WTFArray result;
-    result.is_null_ = is_null_;
-    result.vec_ = internal::Clone(vec_);
-    return result;
-  }
-
-  // Indicates whether the contents of this array are equal to |other|. A null
-  // array is only equal to another null array. If the element type defines an
-  // Equals() method, it will be used; otherwise == operator will be used.
-  bool Equals(const WTFArray& other) const {
-    if (is_null() != other.is_null())
-      return false;
-    return internal::Equals(vec_, other.vec_);
-  }
-
- private:
-  // TODO(dcheng): Use an explicit conversion operator.
-  typedef WTF::Vector<T> WTFArray::*Testable;
-
- public:
-  operator Testable() const {
-    // When the array is set to null, the underlying storage |vec_| shouldn't
-    // contain any elements.
-    DCHECK(!is_null_ || vec_.isEmpty());
-    return is_null_ ? 0 : &WTFArray::vec_;
-  }
-
- private:
-  // Forbid the == and != operators explicitly, otherwise WTFArray will be
-  // converted to Testable to do == or != comparison.
-  template <typename U>
-  bool operator==(const WTFArray<U>& other) const = delete;
-  template <typename U>
-  bool operator!=(const WTFArray<U>& other) const = delete;
-
-  void Take(WTFArray* other) {
-    operator=(nullptr);
-    Swap(other);
-  }
-
-  WTF::Vector<T> vec_;
-  bool is_null_;
-
-  DISALLOW_COPY_AND_ASSIGN(WTFArray);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_