2 files changed, 5 insertions, 5 deletions
diff --git a/migration/migration.cpp b/migration/migration.cpp
index 569dff99..8e5fea5e 100644
--- a/migration/migration.cpp
+++ b/migration/migration.cpp
@@ -29,11 +29,11 @@ namespace detail {
 static std::vector<mptr> migration_list;
 static std::vector<mfun> migration_thunks;
 
-void migrator::register_migration(mptr m)
+void migrator::register_migration(mptr const& m)
 {
     const QString date = m->unique_date();
 
-    for (mptr m2 : migration_list)
+    for (mptr const& m2 : migration_list)
         if (m2->unique_date() == date)
             std::abort();
 
@@ -77,7 +77,7 @@ void migrator::eval_thunks()
         mptr m = fun();
         register_migration(m);
     }
-    if (migration_thunks.size())
+    if (!migration_thunks.empty())
         sort_migrations();
     migration_thunks.clear();
 }
@@ -118,7 +118,7 @@ QString migrator::time_after_migrations()
 {
     const std::vector<mptr>& list = migrations();
 
-    if (list.size() == 0u)
+    if (list.empty())
         return QStringLiteral("19700101_00");
 
     QString ret = list[list.size() - 1]->unique_date();
diff --git a/migration/migration.hpp b/migration/migration.hpp
index 48689fc6..42c8bead 100644
--- a/migration/migration.hpp
+++ b/migration/migration.hpp
@@ -33,7 +33,7 @@ namespace detail {
     private:
         static void sort_migrations();
 
-        static void register_migration(mptr m);
+        static void register_migration(const mptr& m);
         static std::vector<mptr>& migrations();
 
         static void eval_thunks();