Mojo C++ bindings: add StringTraits and ArrayTraits for STL types.
It means mojom string and array can be automatically convert to/from std::string and std::vector, respectively.
This CL also allows array of custom-mapped objects.
BUG=577686
Review-Url: https://codereview.chromium.org/1967703004
Cr-Commit-Position: refs/heads/master@{#393567}
diff --git a/mojo/public/cpp/bindings/string_traits_stl.h b/mojo/public/cpp/bindings/string_traits_stl.h
new file mode 100644
index 0000000..f6cc8ad09
--- /dev/null
+++ b/mojo/public/cpp/bindings/string_traits_stl.h
@@ -0,0 +1,38 @@
+// 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_STRING_TRAITS_STL_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_STL_H_
+
+#include <string>
+
+#include "mojo/public/cpp/bindings/string_traits.h"
+
+namespace mojo {
+
+template <>
+struct StringTraits<std::string> {
+ static bool IsNull(const std::string& input) {
+ // std::string is always converted to non-null mojom string.
+ return false;
+ }
+
+ static void SetToNull(std::string* output) {
+ // std::string doesn't support null state. Set it to empty instead.
+ output->clear();
+ }
+
+ static size_t GetSize(const std::string& input) { return input.size(); }
+
+ static const char* GetData(const std::string& input) { return input.data(); }
+
+ static bool Read(StringDataView input, std::string* output) {
+ output->assign(input.storage(), input.size());
+ return true;
+ }
+};
+
+} // namespace mojo
+
+#endif // MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_STL_H_
