整理

include/boost/numeric/odeint/integrate/detail/integrate_const.hpp

@@ -0,0 +1,167 @@
+/*
+ [auto_generated]
+ boost/numeric/odeint/integrate/detail/integrate_const.hpp
+
+ [begin_description]
+ integrate const implementation
+ [end_description]
+
+ Copyright 2012-2015 Mario Mulansky
+ Copyright 2012 Christoph Koke
+ Copyright 2012 Karsten Ahnert
+
+ Distributed under the Boost Software License, Version 1.0.
+ (See accompanying file LICENSE_1_0.txt or
+ copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_CONST_HPP_INCLUDED
+#define BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_CONST_HPP_INCLUDED
+
+#include <boost/numeric/odeint/util/unwrap_reference.hpp>
+#include <boost/numeric/odeint/stepper/stepper_categories.hpp>
+#include <boost/numeric/odeint/util/unit_helper.hpp>
+#include <boost/numeric/odeint/integrate/detail/integrate_adaptive.hpp>
+
+#include <boost/numeric/odeint/util/detail/less_with_sign.hpp>
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+namespace detail {
+
+// forward declaration
+template< class Stepper , class System , class State , class Time , class Observer >
+size_t integrate_adaptive(
+        Stepper stepper , System system , State &start_state ,
+        Time &start_time , Time end_time , Time &dt ,
+        Observer observer , controlled_stepper_tag
+);
+
+
+template< class Stepper , class System , class State , class Time , class Observer >
+size_t integrate_const(
+        Stepper stepper , System system , State &start_state ,
+        Time start_time , Time end_time , Time dt ,
+        Observer observer , stepper_tag
+)
+{
+
+    typename odeint::unwrap_reference< Observer >::type &obs = observer;
+    typename odeint::unwrap_reference< Stepper >::type &st = stepper;
+
+    Time time = start_time;
+    int step = 0;
+    // cast time+dt explicitely in case of expression templates (e.g. multiprecision)
+    while( less_eq_with_sign( static_cast<Time>(time+dt) , end_time , dt ) )
+    {
+        obs( start_state , time );
+        st.do_step( system , start_state , time , dt );
+        // direct computation of the time avoids error propagation happening when using time += dt
+        // we need clumsy type analysis to get boost units working here
+        ++step;
+        time = start_time + static_cast< typename unit_value_type<Time>::type >(step) * dt;
+    }
+    obs( start_state , time );
+
+    return step;
+}
+
+
+
+template< class Stepper , class System , class State , class Time , class Observer >
+size_t integrate_const(
+        Stepper stepper , System system , State &start_state ,
+        Time start_time , Time end_time , Time dt ,
+        Observer observer , controlled_stepper_tag
+)
+{
+    typename odeint::unwrap_reference< Observer >::type &obs = observer;
+
+    Time time = start_time;
+    const Time time_step = dt;
+    int real_steps = 0;
+    int step = 0;
+    
+    while( less_eq_with_sign( static_cast<Time>(time+time_step) , end_time , dt ) )
+    {
+        obs( start_state , time );
+        // integrate_adaptive_checked uses the given checker to throw if an overflow occurs
+        real_steps += detail::integrate_adaptive(stepper, system, start_state, time,
+                                                 static_cast<Time>(time + time_step), dt,
+                                                 null_observer(), controlled_stepper_tag());
+        // direct computation of the time avoids error propagation happening when using time += dt
+        // we need clumsy type analysis to get boost units working here
+        step++;
+        time = start_time + static_cast< typename unit_value_type<Time>::type >(step) * time_step;
+    }
+    obs( start_state , time );
+
+    return real_steps;
+}
+
+
+template< class Stepper , class System , class State , class Time , class Observer >
+size_t integrate_const(
+        Stepper stepper , System system , State &start_state ,
+        Time start_time , Time end_time , Time dt ,
+        Observer observer , dense_output_stepper_tag
+)
+{
+    typename odeint::unwrap_reference< Observer >::type &obs = observer;
+    typename odeint::unwrap_reference< Stepper >::type &st = stepper;
+
+    Time time = start_time;
+    
+    st.initialize( start_state , time , dt );
+    obs( start_state , time );
+    time += dt;
+
+    int obs_step( 1 );
+    int real_step( 0 );
+    
+    while( less_eq_with_sign( static_cast<Time>(time+dt) , end_time , dt ) )
+    {
+        while( less_eq_with_sign( time , st.current_time() , dt ) )
+        {
+            st.calc_state( time , start_state );
+            obs( start_state , time );
+            ++obs_step;
+            // direct computation of the time avoids error propagation happening when using time += dt
+            // we need clumsy type analysis to get boost units working here
+            time = start_time + static_cast< typename unit_value_type<Time>::type >(obs_step) * dt;
+        }
+        // we have not reached the end, do another real step
+        if( less_with_sign( static_cast<Time>(st.current_time()+st.current_time_step()) ,
+                            end_time ,
+                            st.current_time_step() ) )
+        {
+            while( less_eq_with_sign( st.current_time() , time , dt ) )
+            {
+                st.do_step( system );
+                ++real_step;
+            }
+        }
+        else if( less_with_sign( st.current_time() , end_time , st.current_time_step() ) )
+        { // do the last step ending exactly on the end point
+            st.initialize( st.current_state() , st.current_time() , end_time - st.current_time() );
+            st.do_step( system );
+            ++real_step;
+        }
+        
+    }
+    // last observation, if we are still in observation interval
+    // might happen due to finite precision problems when computing the the time
+    if( less_eq_with_sign( time , end_time , dt ) )
+    {
+        st.calc_state( time , start_state );
+        obs( start_state , time );
+    }
+    
+    return real_step;
+}
+
+
+} } } }
+
+#endif