Remove mojo::Map.

mojo/public/cpp/bindings/stl_converters.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_STL_CONVERTERS_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_STL_CONVERTERS_H_
-
-#include <map>
-#include <string>
-#include <type_traits>
-#include <vector>
-
-#include "mojo/public/cpp/bindings/array.h"
-#include "mojo/public/cpp/bindings/map.h"
-#include "mojo/public/cpp/bindings/string.h"
-
-// Two functions are defined to facilitate conversion between
-// mojo::Array/Map/String and std::vector/map/string: mojo::UnwrapToSTLType()
-// recursively convert mojo types to STL types; mojo::WrapSTLType() does the
-// opposite. For example:
-//   mojo::Array<mojo::Map<mojo::String, mojo::Array<int32_t>>> mojo_obj;
-//
-//   std::vector<std::map<std::string, std::vector<int32_t>>> stl_obj =
-//       mojo::UnwrapToSTLType(std::move(mojo_obj));
-//
-//   mojo_obj = mojo::WrapSTLType(std::move(stl_obj));
-//
-// Notes:
-//   - The conversion moves as much contents as possible. The two functions both
-//     take an rvalue ref as input in order to avoid accidental copies.
-//   - Because std::vector/map/string cannot express null, UnwrapToSTLType()
-//     converts null mojo::Array/Map/String to empty.
-//   - The recursive conversion stops at any types that are not the types listed
-//     above. For example, unwrapping mojo::Array<StructContainingMojoMap> will
-//     result in std::vector<StructContainingMojoMap>. It won't convert
-//     mojo::Map inside the struct.
-
-namespace mojo {
-namespace internal {
-
-template <typename T>
-struct UnwrapTraits;
-
-template <typename T>
-struct UnwrapShouldGoDeeper {
- public:
-  static const bool value =
-      !std::is_same<T, typename UnwrapTraits<T>::Type>::value;
-};
-
-template <typename T>
-struct UnwrapTraits {
- public:
-  using Type = T;
-  static Type Unwrap(T input) { return input; }
-};
-
-template <typename T>
-struct UnwrapTraits<Array<T>> {
- public:
-  using Type = std::vector<typename UnwrapTraits<T>::Type>;
-
-  static Type Unwrap(Array<T> input) {
-    return Helper<T>::Run(std::move(input));
-  }
-
- private:
-  template <typename U, bool should_go_deeper = UnwrapShouldGoDeeper<U>::value>
-  struct Helper {};
-
-  template <typename U>
-  struct Helper<U, true> {
-   public:
-    static Type Run(Array<T> input) {
-      Type output;
-      output.reserve(input.size());
-      for (size_t i = 0; i < input.size(); ++i)
-        output.push_back(UnwrapTraits<T>::Unwrap(std::move(input[i])));
-      return output;
-    }
-  };
-
-  template <typename U>
-  struct Helper<U, false> {
-   public:
-    static Type Run(Array<T> input) { return input.PassStorage(); }
-  };
-};
-
-template <typename K, typename V>
-struct UnwrapTraits<Map<K, V>> {
- public:
-  using Type =
-      std::map<typename UnwrapTraits<K>::Type, typename UnwrapTraits<V>::Type>;
-
-  static Type Unwrap(Map<K, V> input) {
-    return Helper<K, V>::Run(std::move(input));
-  }
-
- private:
-  template <typename X,
-            typename Y,
-            bool should_go_deeper = UnwrapShouldGoDeeper<X>::value ||
-                                    UnwrapShouldGoDeeper<Y>::value>
-  struct Helper {};
-
-  template <typename X, typename Y>
-  struct Helper<X, Y, true> {
-   public:
-    static Type Run(Map<K, V> input) {
-      std::map<K, V> input_storage = input.PassStorage();
-      Type output;
-      for (auto& pair : input_storage) {
-        output.insert(
-            std::make_pair(UnwrapTraits<K>::Unwrap(pair.first),
-                           UnwrapTraits<V>::Unwrap(std::move(pair.second))));
-      }
-      return output;
-    }
-  };
-
-  template <typename X, typename Y>
-  struct Helper<X, Y, false> {
-   public:
-    static Type Run(Map<K, V> input) { return input.PassStorage(); }
-  };
-};
-
-template <>
-struct UnwrapTraits<String> {
- public:
-  using Type = std::string;
-
-  static std::string Unwrap(const String& input) { return input; }
-};
-
-template <typename T>
-struct WrapTraits;
-
-template <typename T>
-struct WrapShouldGoDeeper {
- public:
-  static const bool value =
-      !std::is_same<T, typename WrapTraits<T>::Type>::value;
-};
-
-template <typename T>
-struct WrapTraits {
- public:
-  using Type = T;
-
-  static T Wrap(T input) { return input; }
-};
-
-template <typename T>
-struct WrapTraits<std::vector<T>> {
- public:
-  using Type = Array<typename WrapTraits<T>::Type>;
-
-  static Type Wrap(std::vector<T> input) {
-    return Helper<T>::Run(std::move(input));
-  }
-
- private:
-  template <typename U, bool should_go_deeper = WrapShouldGoDeeper<U>::value>
-  struct Helper {};
-
-  template <typename U>
-  struct Helper<U, true> {
-   public:
-    static Type Run(std::vector<T> input) {
-      std::vector<typename WrapTraits<T>::Type> output_storage;
-      output_storage.reserve(input.size());
-      for (auto& element : input)
-        output_storage.push_back(WrapTraits<T>::Wrap(std::move(element)));
-      return Type(std::move(output_storage));
-    }
-  };
-
-  template <typename U>
-  struct Helper<U, false> {
-   public:
-    static Type Run(std::vector<T> input) { return Type(std::move(input)); }
-  };
-};
-
-template <typename K, typename V>
-struct WrapTraits<std::map<K, V>> {
- public:
-  using Type = Map<typename WrapTraits<K>::Type, typename WrapTraits<V>::Type>;
-
-  static Type Wrap(std::map<K, V> input) {
-    return Helper<K, V>::Run(std::move(input));
-  }
-
- private:
-  template <typename X,
-            typename Y,
-            bool should_go_deeper =
-                WrapShouldGoDeeper<X>::value || WrapShouldGoDeeper<Y>::value>
-  struct Helper {};
-
-  template <typename X, typename Y>
-  struct Helper<X, Y, true> {
-   public:
-    static Type Run(std::map<K, V> input) {
-      Type output;
-      for (auto& pair : input) {
-        output.insert(WrapTraits<K>::Wrap(pair.first),
-                      WrapTraits<V>::Wrap(std::move(pair.second)));
-      }
-      return output;
-    }
-  };
-
-  template <typename X, typename Y>
-  struct Helper<X, Y, false> {
-   public:
-    static Type Run(std::map<K, V> input) { return Type(std::move(input)); }
-  };
-};
-
-template <>
-struct WrapTraits<std::string> {
- public:
-  using Type = String;
-
-  static String Wrap(const std::string& input) { return input; }
-};
-
-}  // namespace internal
-
-template <typename T>
-typename internal::UnwrapTraits<T>::Type UnwrapToSTLType(T&& input) {
-  return internal::UnwrapTraits<T>::Unwrap(std::move(input));
-}
-
-template <typename T>
-typename internal::WrapTraits<T>::Type WrapSTLType(T&& input) {
-  return internal::WrapTraits<T>::Wrap(std::move(input));
-}
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_STL_CONVERTERS_H_