整理

include/boost/numeric/odeint/external/openmp/openmp_state.hpp

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+/*
+ [auto_generated]
+ boost/numeric/odeint/external/openmp/openmp_state.hpp
+
+ [begin_description]
+ Wrappers for OpenMP.
+ [end_description]
+
+ Copyright 2013 Karsten Ahnert
+ Copyright 2013 Mario Mulansky
+ Copyright 2013 Pascal Germroth
+
+ 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_EXTERNAL_OPENMP_OPENMP_STATE_HPP_INCLUDED
+#define BOOST_NUMERIC_ODEINT_EXTERNAL_OPENMP_OPENMP_STATE_HPP_INCLUDED
+
+#include <omp.h>
+#include <vector>
+#include <algorithm>
+#include <type_traits>
+#include <boost/range/adaptor/sliced.hpp>
+#include <boost/numeric/odeint/util/copy.hpp>
+#include <boost/numeric/odeint/util/split.hpp>
+#include <boost/numeric/odeint/util/resize.hpp>
+#include <boost/numeric/odeint/external/openmp/openmp_nested_algebra.hpp>
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+
+/** \brief A container that is split into distinct parts, for threading.
+ * Just a wrapper for vector<vector<T>>, use `copy` for splitting/joining.
+ */
+template< class T >
+struct openmp_state : public std::vector< std::vector< T > >
+{
+    openmp_state() {}
+
+    openmp_state(size_t n, const std::vector<T>& val = std::vector<T>())
+    : std::vector< std::vector< T > >(n, val) {}
+
+    template<class InputIterator>
+    openmp_state(InputIterator first, InputIterator last)
+    : std::vector< std::vector< T > >(first, last) {}
+
+    openmp_state(const std::vector< std::vector< T > > &orig)
+    : std::vector< std::vector< T > >(orig) {}
+
+};
+
+
+
+
+template< class T >
+struct is_resizeable< openmp_state< T > > : std::true_type { };
+
+
+template< class T >
+struct same_size_impl< openmp_state< T > , openmp_state< T > >
+{
+    static bool same_size( const openmp_state< T > &x , const openmp_state< T > &y )
+    {
+        if( x.size() != y.size() ) return false;
+        for( size_t i = 0 ; i != x.size() ; i++ )
+            if( x[i].size() != y[i].size() ) return false;
+        return true;
+    }
+};
+
+
+template< class T >
+struct resize_impl< openmp_state< T > , openmp_state< T > >
+{
+    static void resize( openmp_state< T > &x , const openmp_state< T > &y )
+    {
+        x.resize( y.size() );
+#       pragma omp parallel for schedule(dynamic)
+        for(size_t i = 0 ; i < x.size() ; i++)
+            x[i].resize( y[i].size() );
+    }
+};
+
+
+/** \brief Copy data between openmp_states of same size. */
+template< class T >
+struct copy_impl< openmp_state< T >, openmp_state< T > >
+{
+    static void copy( const openmp_state< T > &from, openmp_state< T > &to )
+    {
+#       pragma omp parallel for schedule(dynamic)
+        for(size_t i = 0 ; i < from.size() ; i++)
+            std::copy( from[i].begin() , from[i].end() , to.begin() );
+    }
+};
+
+
+
+/** \brief Copy data from some container to an openmp_state and resize it.
+ * Target container size will determine number of blocks to split into.
+ * If it is empty, it will be resized to the maximum number of OpenMP threads.
+ * SourceContainer must support `s::value_type`, `s::const_iterator`, `s.begin()`, `s.end()` and `s.size()`,
+ * with Random Access Iterators; i.e. it must be a Random Access Container. */
+template< class SourceContainer >
+struct split_impl< SourceContainer, openmp_state< typename SourceContainer::value_type > >
+{
+    static void split( const SourceContainer &from, openmp_state< typename SourceContainer::value_type > &to )
+    {
+        if(to.size() == 0) to.resize( omp_get_max_threads() );
+        const size_t part = from.size() / to.size();
+#       pragma omp parallel for schedule(dynamic)
+        for(size_t i = 0 ; i < to.size() ; i++) {
+            typedef typename SourceContainer::const_iterator it_t;
+            const it_t begin = from.begin() + i * part;
+            it_t end = begin + part;
+            // for cases where from.size() % to.size() > 0
+            if(i + 1 == to.size() || end > from.end()) end = from.end();
+            to[i].resize(end - begin);
+            std::copy(begin, end, to[i].begin());
+        }
+    }
+};
+
+/** \brief Copy data from an openmp_state to some container and resize it.
+ * TargetContainer must support `s::value_type`, `s::iterator`, `s.begin()` and `s.resize(n)`,
+ * i.e. it must be a `std::vector`. */
+template< class TargetContainer >
+struct unsplit_impl< openmp_state< typename TargetContainer::value_type >, TargetContainer >
+{
+    static void unsplit( const openmp_state< typename TargetContainer::value_type > &from , TargetContainer &to )
+    {
+        // resize target
+        size_t total_size = 0;
+        for(size_t i = 0 ; i < from.size() ; i++)
+            total_size += from[i].size();
+        to.resize( total_size );
+        // copy parts
+        typename TargetContainer::iterator out = to.begin();
+        for(size_t i = 0 ; i < from.size() ; i++)
+            out = std::copy(from[i].begin(), from[i].end(), out);
+    }
+};
+
+
+
+
+/** \brief OpenMP-parallelized algebra.
+ * For use with openmp_state.
+ */
+typedef openmp_nested_algebra< range_algebra > openmp_algebra;
+
+
+
+/** \brief Use `openmp_algebra` for `openmp_state`. */
+template< class T >
+struct algebra_dispatcher< openmp_state< T > >
+{
+    typedef openmp_algebra algebra_type;
+};
+
+
+}
+}
+}
+
+
+#endif
+