Fix a build warning when compiling without postgres or sqlite

2 files changed, 6 insertions, 0 deletions

diff --git a/src/database/postgresql_engine.hpp b/src/database/postgresql_engine.hpp
index f2dcec3..70215d4 100644
--- a/src/database/postgresql_engine.hpp
+++ b/src/database/postgresql_engine.hpp
@@ -45,12 +45,15 @@ private:
 
 #else
 
+using namespace std::string_literals;
+
 class PostgresqlEngine
 {
 public:
   static std::unique_ptr<DatabaseEngine> open(const std::string& string)
   {
     throw std::runtime_error("Cannot open postgresql database "s + string + ": biboumi is not compiled with libpq.");
+    return {};
   }
 };
 
diff --git a/src/database/sqlite3_engine.hpp b/src/database/sqlite3_engine.hpp
index 82d01c9..1b37e8c 100644
--- a/src/database/sqlite3_engine.hpp
+++ b/src/database/sqlite3_engine.hpp
@@ -42,12 +42,15 @@ private:
 
 #else
 
+using namespace std::string_literals;
+
 class Sqlite3Engine
 {
 public:
   static std::unique_ptr<DatabaseEngine> open(const std::string& string)
   {
     throw std::runtime_error("Cannot open sqlite3 database "s + string + ": biboumi is not compiled with sqlite3 lib.");
+    return {};
   }
 };