Mojo C++ bindings: custom type mapping of map

mojo/public/cpp/bindings/tests/struct_with_traits_impl.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_TESTS_STRUCT_WITH_TRAITS_IMPL_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_TESTS_STRUCT_WITH_TRAITS_IMPL_H_
 
 #include <stdint.h>
 
+#include <map>
 #include <string>
 #include <vector>
 
 #include "base/strings/string_piece.h"
 #include "mojo/public/cpp/system/handle.h"
 
 namespace mojo {
 namespace test {
 
 struct NestedStructWithTraitsImpl {
  public:
+  NestedStructWithTraitsImpl();
+  explicit NestedStructWithTraitsImpl(int32_t in_value);
+
   bool operator==(const NestedStructWithTraitsImpl& other) const {
     return value == other.value;
   }
 
   int32_t value = 0;
 };
 
 // A type which knows how to look like a mojo::test::StructWithTraits mojom type
 // by way of mojo::StructTraits.
 class StructWithTraitsImpl {
@@ skipping 22 matching lines @@
   const NestedStructWithTraitsImpl& get_struct() const { return struct_; }
   NestedStructWithTraitsImpl& get_mutable_struct() { return struct_; }
 
   const std::vector<NestedStructWithTraitsImpl>& get_struct_array() const {
     return struct_array_;
   }
   std::vector<NestedStructWithTraitsImpl>& get_mutable_struct_array() {
     return struct_array_;
   }
 
+  const std::map<std::string, NestedStructWithTraitsImpl>& get_struct_map()
+      const {
+    return struct_map_;
+  }
+  std::map<std::string, NestedStructWithTraitsImpl>& get_mutable_struct_map() {
+    return struct_map_;
+  }
+
  private:
   bool bool_ = false;
   uint32_t uint32_ = 0;
   uint64_t uint64_ = 0;
   std::string string_;
   std::vector<std::string> string_array_;
   NestedStructWithTraitsImpl struct_;
   std::vector<NestedStructWithTraitsImpl> struct_array_;
+  std::map<std::string, NestedStructWithTraitsImpl> struct_map_;
 };
 
 // A type which knows how to look like a mojo::test::PassByValueStructWithTraits
 // mojom type by way of mojo::StructTraits.
 class PassByValueStructWithTraitsImpl {
  public:
   PassByValueStructWithTraitsImpl();
   PassByValueStructWithTraitsImpl(PassByValueStructWithTraitsImpl&& other);
   ~PassByValueStructWithTraitsImpl();
 
   ScopedHandle& get_mutable_handle() { return handle_; }
 
  private:
   ScopedHandle handle_;
 };
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_TESTS_STRUCT_WITH_TRAITS_IMPL_H_