BigInteger: guard against self-assignment

Related-to: Tencent#404. Suggested-by: @cosinekitty
pah · Aug 13, 2015 · afbc040 · afbc040
1 parent 3cf7228
commit afbc040
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/include/rapidjson/internal/biginteger.h b/include/rapidjson/internal/biginteger.h
@@ -54,8 +54,10 @@ class BigInteger {
 
     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;
     }