Merge pull request Tencent#1329 from pah/fix-noexcept

Add RAPIDJSON_NOEXCEPT_ASSERT

Author: miloyip

include/rapidjson/document.h

@@ -37,9 +37,6 @@ RAPIDJSON_DIAG_OFF(4244) // conversion from kXxxFlags to 'uint16_t', possible lo
 
 #ifdef __GNUC__
 RAPIDJSON_DIAG_OFF(effc++)
-#if __GNUC__ >= 6
-RAPIDJSON_DIAG_OFF(terminate) // ignore throwing RAPIDJSON_ASSERT in RAPIDJSON_NOEXCEPT functions
-#endif
 #endif // __GNUC__
 
 #ifndef RAPIDJSON_NOMEMBERITERATORCLASS
@@ -625,7 +622,7 @@ class GenericValue {
         \note Default content for number is zero.
     */
     explicit GenericValue(Type type) RAPIDJSON_NOEXCEPT : data_() {
-        static const uint16_t defaultFlags[7] = {
+        static const uint16_t defaultFlags[] = {
             kNullFlag, kFalseFlag, kTrueFlag, kObjectFlag, kArrayFlag, kShortStringFlag,
             kNumberAnyFlag
         };
@@ -831,7 +828,7 @@ class GenericValue {
     /*! \param rhs Source of the assignment. It will become a null value after assignment.
     */
     GenericValue& operator=(GenericValue& rhs) RAPIDJSON_NOEXCEPT {
-        if (this != &rhs) {
+        if (RAPIDJSON_LIKELY(this != &rhs)) {
             this->~GenericValue();
             RawAssign(rhs);
         }

include/rapidjson/rapidjson.h

@@ -593,6 +593,17 @@ RAPIDJSON_NAMESPACE_END
 
 //!@endcond
 
+//! Assertion (in non-throwing contexts).
+ /*! \ingroup RAPIDJSON_CONFIG
+    Some functions provide a \c noexcept guarantee, if the compiler supports it.
+    In these cases, the \ref RAPIDJSON_ASSERT macro cannot be overridden to
+    throw an exception.  This macro adds a separate customization point for
+    such cases.
+
+    Defaults to C \c assert() (as \ref RAPIDJSON_ASSERT), if \c noexcept is
+    supported, and to \ref RAPIDJSON_ASSERT otherwise.
+ */
+
 ///////////////////////////////////////////////////////////////////////////////
 // RAPIDJSON_NOEXCEPT_ASSERT