Mojo C++ bindings: add a new mode to generator to use native STL/WTF types

mojo/public/cpp/bindings/lib/wtf_clone_equals_util.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_LIB_WTF_CLONE_EQUALS_UTIL_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_CLONE_EQUALS_UTIL_H_
+
+#include <type_traits>
+
+#include "mojo/public/cpp/bindings/lib/clone_equals_util.h"
+#include "third_party/WebKit/Source/wtf/HashMap.h"
+#include "third_party/WebKit/Source/wtf/Optional.h"
+#include "third_party/WebKit/Source/wtf/Vector.h"
+#include "third_party/WebKit/Source/wtf/text/WTFString.h"
+
+namespace mojo {
+namespace internal {
+
+template <typename T>
+struct CloneTraits<WTF::Vector<T>, false> {
+  static WTF::Vector<T> Clone(const WTF::Vector<T>& input) {
+    WTF::Vector<T> result;
+    result.reserveCapacity(input.size());
+    for (const auto& element : input)
+      result.append(internal::Clone(element));
+
+    return result;
+  }
+};
+
+template <typename K, typename V>
+struct CloneTraits<WTF::HashMap<K, V>, false> {
+  static WTF::HashMap<K, V> Clone(const WTF::HashMap<K, V>& input) {
+    WTF::HashMap<K, V> result;
+    auto input_end = input.end();
+    for (auto it = input.begin(); it != input_end; ++it)
+      result.add(internal::Clone(it->key), internal::Clone(it->value));
+    return result;
+  }
+};
+
+template <typename T>
+struct EqualsTraits<WTF::Vector<T>, false> {
+  static bool Equals(const WTF::Vector<T>& a, const WTF::Vector<T>& b) {
+    if (a.size() != b.size())
+      return false;
+    for (size_t i = 0; i < a.size(); ++i) {
+      if (!internal::Equals(a[i], b[i]))
+        return false;
+    }
+    return true;
+  }
+};
+
+template <typename K, typename V>
+struct EqualsTraits<WTF::HashMap<K, V>, false> {
+  static bool Equals(const WTF::HashMap<K, V>& a, const WTF::HashMap<K, V>& b) {
+    if (a.size() != b.size())
+      return false;
+
+    auto a_end = a.end();
+    auto b_end = b.end();
+
+    for (auto iter = a.begin(); iter != a_end; ++iter) {
+      auto b_iter = b.find(iter->key);
+      if (b_iter == b_end || !internal::Equals(iter->value, b_iter->value))
+        return false;
+    }
+    return true;
+  }
+};
+
+}  // namespace internal
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_CLONE_EQUALS_UTIL_H_