ipc: Add defaulted move ctor/assignment to ipc structs

This CL provides explicitly defaulted definitions to the
IPC_STRUCT_BEGIN_WITH_PARENT macros for the special member functions:
- copy constructor
- copy assignment operator
- move constructor
- move assignment operator

The goal of this CL is to add the support of move operations to macros
generated structs. Move operations aren't implicitly declared for the structs
because a user-declared destructor is present.

It's important to make these functions explicitly defaulted on their first
declaration to avoid them being user-provided. This allows the compiler to
define them as deleted per 8.4.2.5 of the C++14 standard.

Change-Id: Ie949fa6a9c730a1069f1e75b2c6a8d9981d69431
Reviewed-on: https://chromium-review.googlesource.com/1133260
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574349}

CrOS-Libchrome-Original-Commit: e6cb9f56395acad6eb72628061f9cb609ce4030f

1 files changed, 4 insertions, 0 deletions

diff --git a/ipc/ipc_message_macros.h b/ipc/ipc_message_macros.h
index 2cab6fb258..b9e5b91679 100644
--- a/ipc/ipc_message_macros.h
+++ b/ipc/ipc_message_macros.h
@@ -218,6 +218,10 @@
   IPC_STRUCT_TRAITS_END() \
   struct IPC_MESSAGE_EXPORT struct_name : parent { \
     struct_name(); \
+    struct_name(const struct_name&) = default; \
+    struct_name(struct_name&&) = default; \
+    struct_name& operator=(const struct_name&) = default; \
+    struct_name& operator=(struct_name&&) = default; \
     ~struct_name();
 // Optional variadic parameters specify the default value for this struct
 // member. They are passed through to the constructor for |type|.