Revert a change in reverse iterator to pass the test cases

src/json.hpp

@@ -8686,7 +8686,7 @@ class basic_json
         /// access to successor
         reference operator[](difference_type n) const
         {
-            return base_iterator::operator[](n);
+            return *(this->operator+(n));
         }
 
         /// return the key of an object iterator

test/src/unit-iterators2.cpp

@@ -833,15 +833,15 @@ TEST_CASE("iterators 2")
                     auto it = j_object.rbegin();
                     CHECK_THROWS_AS(it[0], json::invalid_iterator);
                     CHECK_THROWS_AS(it[1], json::invalid_iterator);
-                    //CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
-                    //CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
+                    CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
+                    CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
                 }
                 {
                     auto it = j_object.crbegin();
                     CHECK_THROWS_AS(it[0], json::invalid_iterator);
                     CHECK_THROWS_AS(it[1], json::invalid_iterator);
-                    //CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
-                    //CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
+                    CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
+                    CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators");
                 }
             }
 
@@ -873,15 +873,15 @@ TEST_CASE("iterators 2")
                     auto it = j_null.rbegin();
                     CHECK_THROWS_AS(it[0], json::invalid_iterator);
                     CHECK_THROWS_AS(it[1], json::invalid_iterator);
-                    //CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.214] cannot get value");
-                    //CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.214] cannot get value");
+                    CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.214] cannot get value");
+                    CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.214] cannot get value");
                 }
                 {
                     auto it = j_null.crbegin();
                     CHECK_THROWS_AS(it[0], json::invalid_iterator);
                     CHECK_THROWS_AS(it[1], json::invalid_iterator);
-                    //CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.214] cannot get value");
-                    //CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.214] cannot get value");
+                    CHECK_THROWS_WITH(it[0], "[json.exception.invalid_iterator.214] cannot get value");
+                    CHECK_THROWS_WITH(it[1], "[json.exception.invalid_iterator.214] cannot get value");
                 }
             }