From afbc0406f0a59fd5423b3127ed23ba3414a0c53f Mon Sep 17 00:00:00 2001
From: "Philipp A. Hartmann" <pah@qo.cx>
Date: Thu, 13 Aug 2015 23:07:30 +0200
Subject: [PATCH] BigInteger: guard against self-assignment

Related-to: #404.
Suggested-by: @cosinekitty
---
 include/rapidjson/internal/biginteger.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/rapidjson/internal/biginteger.h b/include/rapidjson/internal/biginteger.h
index f4d6d12..4477cf5 100755
--- a/include/rapidjson/internal/biginteger.h
+++ b/include/rapidjson/internal/biginteger.h
@@ -54,8 +54,10 @@ public:
     
     BigInteger& operator=(const BigInteger &rhs)
     {
-        count_ = rhs.count_;
-        std::memcpy(digits_, rhs.digits_, count_ * sizeof(Type));
+        if (this != &rhs) {
+            count_ = rhs.count_;
+            std::memcpy(digits_, rhs.digits_, count_ * sizeof(Type));
+        }
         return *this;
     }