Cpp: remove duplicate instance classes for DescribeOrderableDBInstanceOptions

cpp/example_code/aurora/README.md

@@ -50,9 +50,9 @@ Code excerpts that show you how to call individual service functions.
 - [Create a DB cluster parameter group](getting_started_with_db_clusters.cpp#L333) (`CreateDBClusterParameterGroup`)
 - [Create a DB cluster snapshot](getting_started_with_db_clusters.cpp#L661) (`CreateDBClusterSnapshot`)
 - [Create a DB instance in a DB cluster](getting_started_with_db_clusters.cpp#L588) (`CreateDBInstance`)
-- [Delete a DB cluster](getting_started_with_db_clusters.cpp#L1031) (`DeleteDBCluster`)
-- [Delete a DB cluster parameter group](getting_started_with_db_clusters.cpp#L1101) (`DeleteDBClusterParameterGroup`)
-- [Delete a DB instance](getting_started_with_db_clusters.cpp#L1001) (`DeleteDBInstance`)
+- [Delete a DB cluster](getting_started_with_db_clusters.cpp#L1033) (`DeleteDBCluster`)
+- [Delete a DB cluster parameter group](getting_started_with_db_clusters.cpp#L1103) (`DeleteDBClusterParameterGroup`)
+- [Delete a DB instance](getting_started_with_db_clusters.cpp#L1003) (`DeleteDBInstance`)
 - [Describe DB cluster parameter groups](getting_started_with_db_clusters.cpp#L295) (`DescribeDBClusterParameterGroups`)
 - [Describe DB cluster snapshots](getting_started_with_db_clusters.cpp#L701) (`DescribeDBClusterSnapshots`)
 - [Describe DB clusters](getting_started_with_db_clusters.cpp#L746) (`DescribeDBClusters`)

cpp/example_code/aurora/getting_started_with_db_clusters.cpp

@@ -954,7 +954,9 @@ bool AwsDoc::Aurora::chooseDBInstanceClass(const Aws::String &engine,
                     outcome.GetResult().GetOrderableDBInstanceOptions();
             for (const Aws::RDS::Model::OrderableDBInstanceOption &option: options) {
                 const Aws::String &instanceClass = option.GetDBInstanceClass();
-                instanceClasses.push_back(instanceClass);
+                if (std::find(instanceClasses.begin(), instanceClasses.end(), instanceClass) == instanceClasses.end()) {
+                    instanceClasses.push_back(instanceClass);
+                }
             }
             marker = outcome.GetResult().GetMarker();
         }