254 lines
10 KiB
Plaintext
254 lines
10 KiB
Plaintext
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/*
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[auto_generated]
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boost/numeric/odeint/iterator/detail/adaptive_iterator_impl.hpp
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[begin_description]
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tba.
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[end_description]
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Copyright 2009-2012 Karsten Ahnert
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Copyright 2009-2012 Mario Mulansky
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or
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copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_NUMERIC_ODEINT_ITERATOR_DETAIL_ADAPTIVE_ITERATOR_IMPL_HPP_DEFINED
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#define BOOST_NUMERIC_ODEINT_ITERATOR_DETAIL_ADAPTIVE_ITERATOR_IMPL_HPP_DEFINED
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/numeric/odeint/util/unit_helper.hpp>
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#include <boost/numeric/odeint/util/copy.hpp>
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#include <boost/numeric/odeint/stepper/controlled_step_result.hpp>
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#include <boost/numeric/odeint/iterator/detail/ode_iterator_base.hpp>
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namespace boost {
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namespace numeric {
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namespace odeint {
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template< class Iterator , class Stepper , class System , class State , typename Tag , typename StepperTag >
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class adaptive_iterator_impl;
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/*
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* Specilization for controlled steppers
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*/
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/**
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* \brief ODE Iterator with adaptive step size control. The value type of this iterator is the state type of the stepper.
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*
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* Implements an ODE iterator with adaptive step size control. Uses controlled steppers. adaptive_iterator is a model
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* of single-pass iterator.
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*
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* The value type of this iterator is the state type of the stepper. Hence one can only access the state and not the current time.
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*
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* \tparam Stepper The stepper type which should be used during the iteration.
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* \tparam System The type of the system function (ODE) which should be solved.
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*/
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template< class Iterator , class Stepper , class System , class State , typename Tag >
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class adaptive_iterator_impl< Iterator , Stepper , System , State , Tag , controlled_stepper_tag >
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: public detail::ode_iterator_base< Iterator , Stepper , System , State , Tag >
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{
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private:
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typedef Stepper stepper_type;
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typedef System system_type;
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typedef typename boost::numeric::odeint::unwrap_reference< stepper_type >::type unwrapped_stepper_type;
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typedef State state_type;
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typedef typename traits::time_type< stepper_type >::type time_type;
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typedef typename traits::value_type< stepper_type >::type ode_value_type;
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#ifndef DOXYGEN_SKIP
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typedef detail::ode_iterator_base< Iterator , Stepper , System , State , Tag > base_type;
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#endif
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public:
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/**
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* \brief Constructs an adaptive_iterator. This constructor should be used to construct the begin iterator.
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*
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* \param stepper The stepper to use during the iteration.
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* \param sys The system function (ODE) to solve.
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* \param s The initial state. adaptive_iterator stores a reference of s and changes its value during the iteration.
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* \param t The initial time.
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* \param t_end The end time, at which the iteration should stop.
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* \param dt The initial time step.
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*/
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adaptive_iterator_impl( stepper_type stepper , system_type sys , state_type &s , time_type t , time_type t_end , time_type dt )
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: base_type( stepper , sys , t , dt ) , m_t_end( t_end ) , m_state( &s )
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{
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if( detail::less_with_sign( this->m_t_end , this->m_t , this->m_dt ) )
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this->m_at_end = true;
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}
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/**
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* \brief Constructs an adaptive_iterator. This constructor should be used to construct the end iterator.
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*
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* \param stepper The stepper to use during the iteration.
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* \param sys The system function (ODE) to solve.
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* \param s The initial state. adaptive_iterator store a reference of s and changes its value during the iteration.
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*/
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adaptive_iterator_impl( stepper_type stepper , system_type sys , state_type &s )
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: base_type( stepper , sys ) , m_state( &s ) { }
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protected:
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friend class boost::iterator_core_access;
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void increment()
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{
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if( detail::less_with_sign( this->m_t , this->m_t_end , this->m_dt) )
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{
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if( detail::less_with_sign( this->m_t_end ,
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static_cast<time_type>(this->m_t + this->m_dt) ,
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this->m_dt ) )
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{
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this->m_dt = this->m_t_end - this->m_t;
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}
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unwrapped_stepper_type &stepper = this->m_stepper;
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const size_t max_attempts = 1000;
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size_t trials = 0;
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controlled_step_result res = success;
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do
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{
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res = stepper.try_step( this->m_system , *( this->m_state ) , this->m_t , this->m_dt );
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++trials;
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}
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while( ( res == fail ) && ( trials < max_attempts ) );
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if( trials == max_attempts )
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{
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BOOST_THROW_EXCEPTION( std::overflow_error( "Adaptive iterator : Maximal number of iterations reached. A step size could not be found." ));
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}
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} else {
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this->m_at_end = true;
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}
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}
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public:
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const state_type& get_state() const
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{
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return *this->m_state;
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}
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private:
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time_type m_t_end;
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state_type* m_state;
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};
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/*
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* Specilization for dense outputer steppers
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*/
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/**
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* \brief ODE Iterator with adaptive step size control. The value type of this iterator is the state type of the stepper.
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*
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* Implements an ODE iterator with adaptive step size control. Uses dense-output steppers. adaptive_iterator is a model
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* of single-pass iterator.
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*
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* The value type of this iterator is the state type of the stepper. Hence one can only access the state and not the current time.
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*
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* \tparam Stepper The stepper type which should be used during the iteration.
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* \tparam System The type of the system function (ODE) which should be solved.
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*/
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template< class Iterator , class Stepper , class System , class State , typename Tag >
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class adaptive_iterator_impl< Iterator , Stepper , System , State , Tag , dense_output_stepper_tag >
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: public detail::ode_iterator_base< Iterator , Stepper , System , State , Tag >
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{
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private:
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typedef Stepper stepper_type;
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typedef System system_type;
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typedef typename boost::numeric::odeint::unwrap_reference< stepper_type >::type unwrapped_stepper_type;
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typedef State state_type;
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typedef typename traits::time_type< stepper_type >::type time_type;
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typedef typename traits::value_type< stepper_type >::type ode_value_type;
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#ifndef DOXYGEN_SKIP
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typedef detail::ode_iterator_base< Iterator , Stepper , System , State , Tag > base_type;
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#endif
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public:
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/**
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* \brief Constructs an adaptive_iterator. This constructor should be used to construct the begin iterator.
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*
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* \param stepper The stepper to use during the iteration.
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* \param sys The system function (ODE) to solve.
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* \param s The initial state.
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* \param t The initial time.
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* \param t_end The end time, at which the iteration should stop.
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* \param dt The initial time step.
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*/
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adaptive_iterator_impl( stepper_type stepper , system_type sys , state_type &s , time_type t , time_type t_end , time_type dt )
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: base_type( stepper , sys , t , dt ) , m_t_end( t_end )
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{
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if( detail::less_eq_with_sign( this->m_t , this->m_t_end , this->m_dt ) )
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{
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unwrapped_stepper_type &st = this->m_stepper;
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st.initialize( s , this->m_t , this->m_dt );
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} else {
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this->m_at_end = true;
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}
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}
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/**
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* \brief Constructs an adaptive_iterator. This constructor should be used to construct the end iterator.
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*
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* \param stepper The stepper to use during the iteration.
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* \param sys The system function (ODE) to solve.
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* \param s The initial state.
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*/
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adaptive_iterator_impl( stepper_type stepper , system_type sys , state_type& /* s */ )
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: base_type( stepper , sys ) { }
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protected:
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friend class boost::iterator_core_access;
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void increment()
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{
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unwrapped_stepper_type &stepper = this->m_stepper;
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if( detail::less_with_sign( this->m_t ,
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this->m_t_end ,
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stepper.current_time_step() ) )
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{
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if( detail::less_with_sign( this->m_t_end ,
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static_cast<time_type>(this->m_t + stepper.current_time_step()) ,
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stepper.current_time_step() ) )
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{
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// make stpper to end exactly at t_end
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stepper.initialize( stepper.current_state() , stepper.current_time() ,
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static_cast<time_type>(this->m_t_end-this->m_t) );
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}
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stepper.do_step( this->m_system );
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this->m_t = stepper.current_time();
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} else { // we have reached t_end
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this->m_at_end = true;
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}
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}
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public:
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const state_type& get_state() const
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{
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const unwrapped_stepper_type &stepper = this->m_stepper;
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return stepper.current_state();
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}
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private:
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time_type m_t_end;
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};
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} // namespace odeint
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} // namespace numeric
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} // namespace boost
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#endif // BOOST_NUMERIC_ODEINT_ITERATOR_DETAIL_ADAPTIVE_ITERATOR_IMPL_HPP_DEFINED
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