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include/boost/numeric/odeint/stepper/adams_moulton.hpp

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+/*
+ [auto_generated]
+ boost/numeric/odeint/stepper/adams_moulton.hpp
+
+ [begin_description]
+ Implementation of the Adams-Moulton method. This is method is not a real stepper, it is more a helper class
+ which computes the corrector step in the Adams-Bashforth-Moulton method.
+ [end_description]
+
+ Copyright 2011-2012 Karsten Ahnert
+ Copyright 2011-2013 Mario Mulansky
+ Copyright 2012 Christoph Koke
+
+ 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_STEPPER_ADAMS_MOULTON_HPP_INCLUDED
+#define BOOST_NUMERIC_ODEINT_STEPPER_ADAMS_MOULTON_HPP_INCLUDED
+
+
+#include <boost/numeric/odeint/util/bind.hpp>
+
+#include <boost/numeric/odeint/algebra/range_algebra.hpp>
+#include <boost/numeric/odeint/algebra/default_operations.hpp>
+#include <boost/numeric/odeint/algebra/algebra_dispatcher.hpp>
+#include <boost/numeric/odeint/algebra/operations_dispatcher.hpp>
+
+#include <boost/numeric/odeint/util/state_wrapper.hpp>
+#include <boost/numeric/odeint/util/is_resizeable.hpp>
+#include <boost/numeric/odeint/util/resizer.hpp>
+
+#include <boost/numeric/odeint/stepper/stepper_categories.hpp>
+#include <boost/numeric/odeint/stepper/runge_kutta4_classic.hpp>
+
+#include <boost/numeric/odeint/stepper/detail/adams_moulton_call_algebra.hpp>
+#include <boost/numeric/odeint/stepper/detail/adams_moulton_coefficients.hpp>
+#include <boost/numeric/odeint/stepper/detail/rotating_buffer.hpp>
+
+
+
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+
+
+/*
+ * Static implicit Adams-Moulton multistep-solver without step size control and without dense output.
+ */
+template<
+size_t Steps ,
+class State ,
+class Value = double ,
+class Deriv = State ,
+class Time = Value ,
+class Algebra = typename algebra_dispatcher< State >::algebra_type ,
+class Operations = typename operations_dispatcher< State >::operations_type ,
+class Resizer = initially_resizer
+>
+class adams_moulton
+{
+private:
+
+
+public :
+
+    typedef State state_type;
+    typedef state_wrapper< state_type > wrapped_state_type;
+    typedef Value value_type;
+    typedef Deriv deriv_type;
+    typedef state_wrapper< deriv_type > wrapped_deriv_type;
+    typedef Time time_type;
+    typedef Algebra algebra_type;
+    typedef Operations operations_type;
+    typedef Resizer resizer_type;
+    typedef stepper_tag stepper_category;
+
+    typedef adams_moulton< Steps , State , Value , Deriv , Time , Algebra , Operations , Resizer > stepper_type;
+
+    static const size_t steps = Steps;
+
+    typedef unsigned short order_type;
+    static const order_type order_value = steps + 1;
+
+    typedef detail::rotating_buffer< wrapped_deriv_type , steps > step_storage_type;
+
+    adams_moulton( )
+    : m_coefficients() , m_dxdt() , m_resizer() ,
+      m_algebra_instance() , m_algebra( m_algebra_instance )
+    { }
+
+    adams_moulton( algebra_type &algebra )
+    : m_coefficients() , m_dxdt() , m_resizer() ,
+      m_algebra_instance() , m_algebra( algebra )
+    { }
+
+    adams_moulton& operator=( const adams_moulton &stepper )
+    {
+        m_dxdt = stepper.m_dxdt;
+        m_resizer = stepper.m_resizer;
+        m_algebra = stepper.m_algebra;
+        return *this;
+    }
+
+    order_type order( void ) const { return order_value; }
+
+
+    /*
+     * Version 1 : do_step( system , x , t , dt , buf );
+     *
+     * solves the forwarding problem
+     */
+    template< class System , class StateInOut , class StateIn , class ABBuf >
+    void do_step( System system , StateInOut &x , StateIn const & pred , time_type t , time_type dt , const ABBuf &buf )
+    {
+        do_step( system , x , pred , t , x , dt , buf );
+    }
+
+    template< class System , class StateInOut , class StateIn , class ABBuf >
+    void do_step( System system , const StateInOut &x , StateIn const & pred , time_type t , time_type dt , const ABBuf &buf )
+    {
+        do_step( system , x , pred , t , x , dt , buf );
+    }
+
+
+
+    /*
+     * Version 2 : do_step( system , in , t , out , dt , buf );
+     *
+     * solves the forwarding problem
+     */
+    template< class System , class StateIn , class PredIn , class StateOut , class ABBuf >
+    void do_step( System system , const StateIn &in , const PredIn &pred , time_type t , StateOut &out , time_type dt , const ABBuf &buf )
+    {
+        do_step_impl( system , in , pred , t , out , dt , buf );
+    }
+
+    template< class System , class StateIn , class PredIn , class StateOut , class ABBuf >
+    void do_step( System system , const StateIn &in , const PredIn &pred , time_type t , const StateOut &out , time_type dt , const ABBuf &buf )
+    {
+        do_step_impl( system , in , pred , t , out , dt , buf );
+    }
+
+
+
+    template< class StateType >
+    void adjust_size( const StateType &x )
+    {
+        resize_impl( x );
+    }
+
+    algebra_type& algebra()
+    {   return m_algebra; }
+
+    const algebra_type& algebra() const
+    {   return m_algebra; }
+
+
+private:
+
+
+    template< class System , class StateIn , class PredIn , class StateOut , class ABBuf >
+    void do_step_impl( System system , const StateIn &in , const PredIn &pred , time_type t , StateOut &out , time_type dt , const ABBuf &buf )
+    {
+        typename odeint::unwrap_reference< System >::type &sys = system;
+        m_resizer.adjust_size(in, [this](auto&& arg) { return this->resize_impl<StateIn>(std::forward<decltype(arg)>(arg)); });
+        sys( pred , m_dxdt.m_v , t );
+        detail::adams_moulton_call_algebra< steps , algebra_type , operations_type >()( m_algebra , in , out , m_dxdt.m_v , buf , m_coefficients , dt );
+    }
+
+
+    template< class StateIn >
+    bool resize_impl( const StateIn &x )
+    {
+        return adjust_size_by_resizeability( m_dxdt , x , typename is_resizeable<deriv_type>::type() );
+    }
+
+
+    const detail::adams_moulton_coefficients< value_type , steps > m_coefficients;
+    wrapped_deriv_type m_dxdt;
+    resizer_type m_resizer;
+
+protected:
+
+    algebra_type m_algebra_instance;
+    algebra_type &m_algebra;
+};
+
+
+
+
+} // odeint
+} // numeric
+} // boost
+
+
+
+#endif // BOOST_NUMERIC_ODEINT_STEPPER_ADAMS_MOULTON_HPP_INCLUDED