Handle non-throwing exception specifications that can still throw Tencent#1280

Author: Benjamin Lee

include/rapidjson/document.h

@@ -629,7 +629,7 @@ class GenericValue {
             kNullFlag, kFalseFlag, kTrueFlag, kObjectFlag, kArrayFlag, kShortStringFlag,
             kNumberAnyFlag
         };
-        RAPIDJSON_ASSERT(type >= kNullType && type <= kNumberType);
+        RAPIDJSON_NOEXCEPT_ASSERT(type >= kNullType && type <= kNumberType);
         data_.f.flags = defaultFlags[type];
 
         // Use ShortString to store empty string.
@@ -831,9 +831,10 @@ class GenericValue {
     /*! \param rhs Source of the assignment. It will become a null value after assignment.
     */
     GenericValue& operator=(GenericValue& rhs) RAPIDJSON_NOEXCEPT {
-        RAPIDJSON_ASSERT(this != &rhs);
-        this->~GenericValue();
-        RawAssign(rhs);
+        if (this != &rhs) {
+            this->~GenericValue();
+            RawAssign(rhs);
+        }
         return *this;
     }
 

include/rapidjson/rapidjson.h

@@ -591,6 +591,19 @@ RAPIDJSON_NAMESPACE_END
 
 //!@endcond
 
+///////////////////////////////////////////////////////////////////////////////
+// RAPIDJSON_NOEXCEPT_ASSERT
+
+#ifdef RAPIDJSON_ASSERT_THROWS
+#if RAPIDJSON_HAS_CXX11_NOEXCEPT
+#define RAPIDJSON_NOEXCEPT_ASSERT(x)
+#else
+#define RAPIDJSON_NOEXCEPT_ASSERT(x) RAPIDJSON_ASSERT(x)
+#endif // RAPIDJSON_HAS_CXX11_NOEXCEPT
+#else
+#define RAPIDJSON_NOEXCEPT_ASSERT(x) RAPIDJSON_ASSERT(x)
+#endif // RAPIDJSON_ASSERT_THROWS
+
 ///////////////////////////////////////////////////////////////////////////////
 // new/delete