.. _program_listing_file_src_pcms_transient_timestepper.hpp:

Program Listing for File timestepper.hpp
========================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_pcms_transient_timestepper.hpp>` (``src/pcms/transient/timestepper.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef PCMS_TRANSIENT_TIMESTEPPER_HPP
   #define PCMS_TRANSIENT_TIMESTEPPER_HPP
   
   #include "pcms/utility/types.h"
   
   namespace pcms
   {
   
   struct Step
   {
     bool accepted;
     Real next_step;
   };
   
   class Timestepper
   {
   public:
     [[nodiscard]] virtual Real InitialStep() const = 0;
   
     [[nodiscard]] virtual Step UpdateStep(Real dt, Real err) = 0;
   
     virtual ~Timestepper() = default;
   };
   
   class FixedTimestepper : public Timestepper
   {
   public:
     explicit FixedTimestepper(Real dt);
   
     Real InitialStep() const override;
   
     Step UpdateStep(Real dt, Real err) override;
   
   private:
     Real dt_;
   };
   
   } // namespace pcms
   
   #endif // PCMS_TRANSIENT_TIMESTEPPER_HPP