Merge commit '4ebe6417a5fce5f0994fc0c31bebf732be96a07c' as 'boost'

2026-06-03 22:44:44 -04:00 · 2018-06-09 21:48:33 +01:00
parent b5eabc6d6a 4ebe6417a5
commit 5abe797e3c
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+/*
+ libs/numeric/odeint/examples/stochastic_euler.hpp
+
+ Copyright 2012 Karsten Ahnert
+ Copyright 2012-2013 Mario Mulansky
+ Copyright 2013 Pascal Germroth
+
+ Stochastic euler stepper example and Ornstein-Uhlenbeck process
+
+ 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)
+ */
+
+#include <boost/array.hpp>
+
+#include <boost/numeric/odeint.hpp>
+
+typedef boost::array< double , 1 > state_type;
+
+using namespace boost::numeric::odeint;
+
+
+//[ generation_functions_own_steppers
+class custom_stepper
+{
+public:
+
+    typedef double value_type;
+    // ...
+};
+
+class custom_controller
+{
+    // ...
+};
+
+class custom_dense_output
+{
+    // ...
+};
+//]
+
+
+//[ generation_functions_get_controller
+namespace boost { namespace numeric { namespace odeint {
+
+template<>
+struct get_controller< custom_stepper >
+{
+    typedef custom_controller type;
+};
+
+} } }
+//]
+
+//[ generation_functions_controller_factory
+namespace boost { namespace numeric { namespace odeint {
+
+template<>
+struct controller_factory< custom_stepper , custom_controller >
+{
+    custom_controller operator()( double abs_tol , double rel_tol , const custom_stepper & ) const
+    {
+        return custom_controller();
+    }
+
+    custom_controller operator()( double abs_tol , double rel_tol , double max_dt ,
+                                  const custom_stepper & ) const
+    {
+        // version with maximal allowed step size max_dt
+        return custom_controller();
+    }
+};
+
+} } }
+//]
+
+int main( int argc , char **argv )
+{
+    {
+        typedef runge_kutta_dopri5< state_type > stepper_type;
+
+        /*
+        //[ generation_functions_syntax_auto
+        auto stepper1 = make_controlled( 1.0e-6 , 1.0e-6 , stepper_type() );
+        // or with max step size limit:
+        // auto stepper1 = make_controlled( 1.0e-6 , 1.0e-6 , 0.01, stepper_type() );
+
+        auto stepper2 = make_dense_output( 1.0e-6 , 1.0e-6 , stepper_type() );
+        //]
+        */
+
+        //[ generation_functions_syntax_result_of
+        boost::numeric::odeint::result_of::make_controlled< stepper_type >::type stepper3 = make_controlled( 1.0e-6 , 1.0e-6 , stepper_type() );
+        (void)stepper3;
+        boost::numeric::odeint::result_of::make_dense_output< stepper_type >::type stepper4 = make_dense_output( 1.0e-6 , 1.0e-6 , stepper_type() );
+        (void)stepper4;
+        //]
+    }
+
+    {
+        /*
+        //[ generation_functions_example_custom_controller
+        auto stepper5 = make_controlled( 1.0e-6 , 1.0e-6 , custom_stepper() );
+        //]
+        */
+
+        boost::numeric::odeint::result_of::make_controlled< custom_stepper >::type stepper5 = make_controlled( 1.0e-6 , 1.0e-6 , custom_stepper() );
+        (void)stepper5;
+    }
+    return 0;
+}