Don't use &vector.front() for vector which might be emptylibdbpp-postgresql-1.4.9

Instead just use .data() which safely returns something which might be nullptr, but that's fine.

3 files changed, 5 insertions, 5 deletions

diff --git a/libpqpp/pq-bulkselectcommand.cpp b/libpqpp/pq-bulkselectcommand.cpp
index 8c9e1f0..298261e 100644
--- a/libpqpp/pq-bulkselectcommand.cpp
+++ b/libpqpp/pq-bulkselectcommand.cpp
@@ -18,8 +18,8 @@ void
 PQ::BulkSelectCommand::execute()
 {
 	if (!executed) {
-		execRes = c->checkResult(PQexecPrepared(c->conn, prepare(), static_cast<int>(values.size()), &values.front(),
-										 &lengths.front(), &formats.front(), binary),
+		execRes = c->checkResult(PQexecPrepared(c->conn, prepare(), static_cast<int>(values.size()), values.data(),
+										 lengths.data(), formats.data(), binary),
 				PGRES_TUPLES_OK);
 		nTuples = static_cast<decltype(nTuples)>(PQntuples(execRes));
 		tuple = static_cast<decltype(tuple)>(-1);
diff --git a/libpqpp/pq-cursorselectcommand.cpp b/libpqpp/pq-cursorselectcommand.cpp
index 96d3dc3..8d3a7bf 100644
--- a/libpqpp/pq-cursorselectcommand.cpp
+++ b/libpqpp/pq-cursorselectcommand.cpp
@@ -46,7 +46,7 @@ PQ::CursorSelectCommand::execute()
 			s_declare = mkdeclare();
 		}
 		c->checkResultFree(PQexecParams(c->conn, s_declare.c_str(), static_cast<int>(values.size()), nullptr,
-								   &values.front(), &lengths.front(), &formats.front(), binary),
+								   values.data(), lengths.data(), formats.data(), binary),
 				PGRES_COMMAND_OK);
 		fetchTuples();
 		createColumns(execRes);
diff --git a/libpqpp/pq-modifycommand.cpp b/libpqpp/pq-modifycommand.cpp
index 38c10f6..b29fda7 100644
--- a/libpqpp/pq-modifycommand.cpp
+++ b/libpqpp/pq-modifycommand.cpp
@@ -15,8 +15,8 @@ PQ::ModifyCommand::ModifyCommand(Connection * conn, const std::string & sql, con
 unsigned int
 PQ::ModifyCommand::execute(bool anc)
 {
-	PGresult * res = PQexecPrepared(c->conn, prepare(), static_cast<int>(values.size()), &values.front(),
-			&lengths.front(), &formats.front(), 0);
+	PGresult * res = PQexecPrepared(
+			c->conn, prepare(), static_cast<int>(values.size()), values.data(), lengths.data(), formats.data(), 0);
 	c->checkResult(res, PGRES_COMMAND_OK, PGRES_TUPLES_OK);
 	auto rows = atoi(PQcmdTuples(res));
 	PQclear(res);