minor: fix microbenchmark compilations

Author: acmorrow

benchmark/microbench.hpp

@@ -18,6 +18,7 @@
 
 #include <algorithm>
 #include <set>
+#include <string>
 #include <unordered_map>
 #include <vector>
 

benchmark/multi_doc/gridfs_upload.hpp

@@ -18,6 +18,7 @@
 
 #include <vector>
 
+#include <bsoncxx/string/to_string.hpp>
 #include <mongocxx/client.hpp>
 #include <mongocxx/gridfs/bucket.hpp>
 #include <mongocxx/instance.hpp>
@@ -68,8 +69,8 @@ void gridfs_upload::setup() {
 void gridfs_upload::before_task() {
     auto db = _conn["perftest"];
     _bucket = db.gridfs_bucket();
-    db[_bucket.bucket_name().to_string() + ".chunks"].drop();
-    db[_bucket.bucket_name().to_string() + ".files"].drop();
+    db[bsoncxx::string::to_string(_bucket.bucket_name()) + ".chunks"].drop();
+    db[bsoncxx::string::to_string(_bucket.bucket_name()) + ".files"].drop();
     auto uploader = _bucket.open_upload_stream("one_byte_gridfs_file");
     std::uint8_t byte[1] = {72};
     uploader.write(byte, 1);
@@ -85,4 +86,4 @@ void gridfs_upload::task() {
     uploader.write(_gridfs_file.data(), _gridfs_file.size());
     uploader.close();
 }
-}  // namespace benchmark
+}  // namespace benchmark

benchmark/parallel/gridfs_multi_import.hpp

@@ -21,6 +21,7 @@
 #include <thread>
 #include <vector>
 
+#include <bsoncxx/string/to_string.hpp>
 #include <mongocxx/gridfs/bucket.hpp>
 #include <mongocxx/instance.hpp>
 #include <mongocxx/pool.hpp>
@@ -75,8 +76,8 @@ void gridfs_multi_import::before_task() {
     auto conn = _pool.acquire();
     auto db = (*conn)["perftest"];
     auto bucket = db.gridfs_bucket();
-    db[bucket.bucket_name().to_string() + ".chunks"].drop();
-    db[bucket.bucket_name().to_string() + ".files"].drop();
+    db[bsoncxx::string::to_string(bucket.bucket_name()) + ".chunks"].drop();
+    db[bsoncxx::string::to_string(bucket.bucket_name()) + ".files"].drop();
     auto uploader = bucket.open_upload_stream("one_byte_gridfs_file");
     std::uint8_t byte[1] = {72};
     uploader.write(byte, 1);
@@ -118,4 +119,4 @@ void gridfs_multi_import::concurrency_task(std::uint32_t start_file, std::uint32
         auto uploader = bucket.upload_from_stream(file_name, &stream);
     }
 }
-}  // namespace benchmark
+}  // namespace benchmark