C++11: Use type aliases instead of typedefs

snapshot/mac/process_types/traits.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 // This file is intended to be included multiple times in the same translation
 // unit, so #include guards are intentionally absent.
 //
 // This file is included by snapshot/mac/process_types.h and
 // snapshot/mac/process_types/internal.h to produce traits class definitions.
 
 // Things that #include this file should #undef
 // DECLARE_PROCESS_TYPE_TRAITS_CLASS before #including this file again and after
 // the last #include of this file.
 //
 // |Reserved| is used for padding fields that may be zero-length, and thus
 // __VA_ARGS__, which is intended to set the alignment of the 64-bit types, is
-// not used for that typedef.
+// not used for that type alias.
 #define DECLARE_PROCESS_TYPE_TRAITS_CLASS(traits_name, lp_bits, ...) \
   namespace crashpad {                                                  \
   namespace process_types {                                          \
   namespace internal {                                               \
   struct Traits##traits_name {                                       \
-    typedef int##lp_bits##_t Long __VA_ARGS__;                       \
-    typedef uint##lp_bits##_t ULong __VA_ARGS__;                     \
-    typedef uint##lp_bits##_t Pointer __VA_ARGS__;                   \
-    typedef int##lp_bits##_t IntPtr __VA_ARGS__;                     \
-    typedef uint##lp_bits##_t UIntPtr __VA_ARGS__;                   \
-    typedef Reserved64Only##lp_bits Reserved64Only;                  \
+    using Long = int##lp_bits##_t __VA_ARGS__;                       \
+    using ULong = uint##lp_bits##_t __VA_ARGS__;                     \
+    using Pointer = uint##lp_bits##_t __VA_ARGS__;                   \
+    using IntPtr = int##lp_bits##_t __VA_ARGS__;                     \
+    using UIntPtr = uint##lp_bits##_t __VA_ARGS__;                   \
+    using Reserved64Only = Reserved64Only##lp_bits;                  \
   };                                                                 \
   }                                                                  \
   }                                                                  \
   }