From 5a76e633ea9b5adb215e93fdc11e1c0c08b3fc74 Mon Sep 17 00:00:00 2001
From: Adam Cozzette <acozzette@google.com>
Date: Thu, 17 Nov 2016 16:48:38 -0800
Subject: Integrated internal changes from Google

---
 src/google/protobuf/message_lite.h | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

(limited to 'src/google/protobuf/message_lite.h')

diff --git a/src/google/protobuf/message_lite.h b/src/google/protobuf/message_lite.h
index d3c3b1f0..d5de8cdb 100644
--- a/src/google/protobuf/message_lite.h
+++ b/src/google/protobuf/message_lite.h
@@ -40,6 +40,7 @@
 #define GOOGLE_PROTOBUF_MESSAGE_LITE_H__
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
 
 
 namespace google {
@@ -239,17 +240,22 @@ class LIBPROTOBUF_EXPORT MessageLite {
   bool AppendPartialToString(string* output) const;
 
   // Computes the serialized size of the message.  This recursively calls
-  // ByteSize() on all embedded messages.  Subclasses MUST override either
-  // ByteSize() or ByteSizeLong() (overriding both is fine).
+  // ByteSizeLong() on all embedded messages.
   //
-  // ByteSize() is generally linear in the number of fields defined for the
+  // ByteSizeLong() is generally linear in the number of fields defined for the
   // proto.
-  virtual int ByteSize() const { return ByteSizeLong(); }
-  virtual size_t ByteSizeLong() const;
+  virtual size_t ByteSizeLong() const = 0;
 
-  // Serializes the message without recomputing the size.  The message must
-  // not have changed since the last call to ByteSize(); if it has, the results
-  // are undefined.
+  // Legacy ByteSize() API.
+  int ByteSize() const {
+    size_t result = ByteSizeLong();
+    GOOGLE_DCHECK_LE(result, static_cast<size_t>(INT_MAX));
+    return static_cast<int>(result);
+  }
+
+  // Serializes the message without recomputing the size.  The message must not
+  // have changed since the last call to ByteSize(), and the value returned by
+  // ByteSize must be non-negative.  Otherwise the results are undefined.
   virtual void SerializeWithCachedSizes(
       io::CodedOutputStream* output) const = 0;
 
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