First definition of the abstract LTI types

src/AbstractLTIsystems.f90

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+module lightrom_AbstractLTIsystems
+  use LightKrylov
+  implicit none
+  include "dtypes.h"
+
+  private
+
+  !-------------------------------------------------------
+  !-----     ABSTRACT LTI SYSTEM TYPE DEFINITION     -----
+  !-------------------------------------------------------
+
+  !> General abstract type for general system.
+  type, abstract, public :: abstract_dynamical_system
+  end type abstract_dynamical_system
+
+  !> Abstract continuous LTI system.
+  type, extends(abstract_dynamical_system), abstract, public :: abstract_lti_system
+  end type abstract_lti_system
+
+  !> Abstract discrete LTI system.
+  type, extends(abstract_dynamical_system), abstract, public :: abstract_dlti_system
+  end type abstract_dlti_system
+
+contains
+end module lightrom_AbstractLTIsystems

src/Utils.f90

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+module lightrom_utils
+  implicit none
+  include "dtypes.h"
+
+  private
+
+contains
+end module lightrom_utils