[TimeInterval] Added a copy constructor

BaseLib/TimeInterval.h

@@ -30,6 +30,12 @@ public:
     {
     }
 
+    explicit TimeInterval(const TimeInterval& time_inverval)
+        : _start_time(time_inverval._start_time),
+          _end_time(time_inverval._end_time)
+    {
+    }
+
     bool contains(const double current_time) const
     {
         return (current_time >= _start_time && current_time <= _end_time);

ProcessLib/BoundaryCondition/DirichletBoundaryConditionWithinTimeInterval.h

@@ -49,7 +49,7 @@ private:
     int const _variable_id;
     int const _component_id;
 
-    std::unique_ptr<BaseLib::TimeInterval> _time_interval;
+    std::unique_ptr<BaseLib::TimeInterval const> _time_interval;
 };
 
 std::unique_ptr<DirichletBoundaryConditionWithinTimeInterval>