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+/*=============================================================================
+    Copyright (c) 2007-2011 Hartmut Kaiser
+    Copyright (c) Christopher Diggins 2005
+    Copyright (c) Pablo Aguilar 2005
+    Copyright (c) Kevlin Henney 2001
+
+    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)
+
+    The class boost::spirit::hold_any is built based on the any class
+    published here: http://www.codeproject.com/cpp/dynamic_typing.asp. It adds
+    support for std streaming operator<<() and operator>>().
+==============================================================================*/
+#if !defined(BOOST_SPIRIT_HOLD_ANY_MAY_02_2007_0857AM)
+#define BOOST_SPIRIT_HOLD_ANY_MAY_02_2007_0857AM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/assert.hpp>
+#include <boost/detail/sp_typeinfo.hpp>
+
+#include <stdexcept>
+#include <typeinfo>
+#include <algorithm>
+#include <iosfwd>
+
+///////////////////////////////////////////////////////////////////////////////
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+# pragma warning(push)
+# pragma warning(disable: 4100)   // 'x': unreferenced formal parameter
+# pragma warning(disable: 4127)   // conditional expression is constant
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit
+{
+    struct bad_any_cast
+      : std::bad_cast
+    {
+        bad_any_cast(boost::detail::sp_typeinfo const& src, boost::detail::sp_typeinfo const& dest)
+          : from(src.name()), to(dest.name())
+        {}
+
+        virtual const char* what() const throw() { return "bad any cast"; }
+
+        const char* from;
+        const char* to;
+    };
+
+    namespace detail
+    {
+        // function pointer table
+        struct fxn_ptr_table
+        {
+            boost::detail::sp_typeinfo const& (*get_type)();
+            void (*static_delete)(void**);
+            void (*destruct)(void**);
+            void (*clone)(void* const*, void**);
+            void (*move)(void* const*, void**);
+            std::istream& (*stream_in)(std::istream&, void**);
+            std::ostream& (*stream_out)(std::ostream&, void* const*);
+        };
+
+        // static functions for small value-types
+        template<typename Small>
+        struct fxns;
+
+        template<>
+        struct fxns<mpl::true_>
+        {
+            template<typename T>
+            struct type
+            {
+                static boost::detail::sp_typeinfo const& get_type()
+                {
+                    return BOOST_SP_TYPEID(T);
+                }
+                static void static_delete(void** x)
+                {
+                    reinterpret_cast<T*>(x)->~T();
+                }
+                static void destruct(void** x)
+                {
+                    reinterpret_cast<T*>(x)->~T();
+                }
+                static void clone(void* const* src, void** dest)
+                {
+                    new (dest) T(*reinterpret_cast<T const*>(src));
+                }
+                static void move(void* const* src, void** dest)
+                {
+                    reinterpret_cast<T*>(dest)->~T();
+                    *reinterpret_cast<T*>(dest) =
+                        *reinterpret_cast<T const*>(src);
+                }
+                static std::istream& stream_in (std::istream& i, void** obj)
+                {
+                    i >> *reinterpret_cast<T*>(obj);
+                    return i;
+                }
+                static std::ostream& stream_out(std::ostream& o, void* const* obj)
+                {
+                    o << *reinterpret_cast<T const*>(obj);
+                    return o;
+                }
+            };
+        };
+
+        // static functions for big value-types (bigger than a void*)
+        template<>
+        struct fxns<mpl::false_>
+        {
+            template<typename T>
+            struct type
+            {
+                static boost::detail::sp_typeinfo const& get_type()
+                {
+                    return BOOST_SP_TYPEID(T);
+                }
+                static void static_delete(void** x)
+                {
+                    // destruct and free memory
+                    delete (*reinterpret_cast<T**>(x));
+                }
+                static void destruct(void** x)
+                {
+                    // destruct only, we'll reuse memory
+                    (*reinterpret_cast<T**>(x))->~T();
+                }
+                static void clone(void* const* src, void** dest)
+                {
+                    *dest = new T(**reinterpret_cast<T* const*>(src));
+                }
+                static void move(void* const* src, void** dest)
+                {
+                    (*reinterpret_cast<T**>(dest))->~T();
+                    **reinterpret_cast<T**>(dest) =
+                        **reinterpret_cast<T* const*>(src);
+                }
+                static std::istream& stream_in(std::istream& i, void** obj)
+                {
+                    i >> **reinterpret_cast<T**>(obj);
+                    return i;
+                }
+                static std::ostream& stream_out(std::ostream& o, void* const* obj)
+                {
+                    o << **reinterpret_cast<T* const*>(obj);
+                    return o;
+                }
+            };
+        };
+
+        template<typename T>
+        struct get_table
+        {
+            typedef mpl::bool_<(sizeof(T) <= sizeof(void*))> is_small;
+
+            static fxn_ptr_table* get()
+            {
+                static fxn_ptr_table static_table =
+                {
+                    fxns<is_small>::template type<T>::get_type,
+                    fxns<is_small>::template type<T>::static_delete,
+                    fxns<is_small>::template type<T>::destruct,
+                    fxns<is_small>::template type<T>::clone,
+                    fxns<is_small>::template type<T>::move,
+                    fxns<is_small>::template type<T>::stream_in,
+                    fxns<is_small>::template type<T>::stream_out
+                };
+                return &static_table;
+            }
+        };
+
+        ///////////////////////////////////////////////////////////////////////
+        struct empty {};
+
+        inline std::istream&
+        operator>> (std::istream& i, empty&)
+        {
+            // If this assertion fires you tried to insert from a std istream
+            // into an empty hold_any instance. This simply can't work, because
+            // there is no way to figure out what type to extract from the
+            // stream.
+            // The only way to make this work is to assign an arbitrary
+            // value of the required type to the hold_any instance you want to
+            // stream to. This assignment has to be executed before the actual
+            // call to the operator>>().
+            BOOST_ASSERT(false && 
+                "Tried to insert from a std istream into an empty "
+                "hold_any instance");
+            return i;
+        }
+
+        inline std::ostream&
+        operator<< (std::ostream& o, empty const&)
+        {
+            return o;
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    class hold_any
+    {
+    public:
+        // constructors
+        template <typename T>
+        explicit hold_any(T const& x)
+          : table(spirit::detail::get_table<T>::get()), object(0)
+        {
+            if (spirit::detail::get_table<T>::is_small::value)
+                new (&object) T(x);
+            else
+                object = new T(x);
+        }
+
+        hold_any()
+          : table(spirit::detail::get_table<spirit::detail::empty>::get()),
+            object(0)
+        {
+        }
+
+        hold_any(hold_any const& x)
+          : table(spirit::detail::get_table<spirit::detail::empty>::get()),
+            object(0)
+        {
+            assign(x);
+        }
+
+        ~hold_any()
+        {
+            table->static_delete(&object);
+        }
+
+        // assignment
+        hold_any& assign(hold_any const& x)
+        {
+            if (&x != this) {
+                // are we copying between the same type?
+                if (table == x.table) {
+                    // if so, we can avoid reallocation
+                    table->move(&x.object, &object);
+                }
+                else {
+                    reset();
+                    x.table->clone(&x.object, &object);
+                    table = x.table;
+                }
+            }
+            return *this;
+        }
+
+        template <typename T>
+        hold_any& assign(T const& x)
+        {
+            // are we copying between the same type?
+            spirit::detail::fxn_ptr_table* x_table =
+                spirit::detail::get_table<T>::get();
+            if (table == x_table) {
+            // if so, we can avoid deallocating and re-use memory
+                table->destruct(&object);    // first destruct the old content
+                if (spirit::detail::get_table<T>::is_small::value) {
+                    // create copy on-top of object pointer itself
+                    new (&object) T(x);
+                }
+                else {
+                    // create copy on-top of old version
+                    new (object) T(x);
+                }
+            }
+            else {
+                if (spirit::detail::get_table<T>::is_small::value) {
+                    // create copy on-top of object pointer itself
+                    table->destruct(&object); // first destruct the old content
+                    new (&object) T(x);
+                }
+                else {
+                    reset();                  // first delete the old content
+                    object = new T(x);
+                }
+                table = x_table;      // update table pointer
+            }
+            return *this;
+        }
+
+        // assignment operator
+        template <typename T>
+        hold_any& operator=(T const& x)
+        {
+            return assign(x);
+        }
+
+        // utility functions
+        hold_any& swap(hold_any& x)
+        {
+            std::swap(table, x.table);
+            std::swap(object, x.object);
+            return *this;
+        }
+
+        boost::detail::sp_typeinfo const& type() const
+        {
+            return table->get_type();
+        }
+
+        template <typename T>
+        T const& cast() const
+        {
+            if (type() != BOOST_SP_TYPEID(T))
+              throw bad_any_cast(type(), BOOST_SP_TYPEID(T));
+
+            return spirit::detail::get_table<T>::is_small::value ?
+                *reinterpret_cast<T const*>(&object) :
+                *reinterpret_cast<T const*>(object);
+        }
+
+// implicit casting is disabled by default for compatibility with boost::any
+#ifdef BOOST_SPIRIT_ANY_IMPLICIT_CASTING
+        // automatic casting operator
+        template <typename T>
+        operator T const& () const { return cast<T>(); }
+#endif // implicit casting
+
+        bool empty() const
+        {
+            return table == spirit::detail::get_table<spirit::detail::empty>::get();
+        }
+
+        void reset()
+        {
+            if (!empty())
+            {
+                table->static_delete(&object);
+                table = spirit::detail::get_table<spirit::detail::empty>::get();
+                object = 0;
+            }
+        }
+
+    // these functions have been added in the assumption that the embedded
+    // type has a corresponding operator defined, which is completely safe
+    // because spirit::hold_any is used only in contexts where these operators
+    // do exist
+        friend std::istream& operator>> (std::istream& i, hold_any& obj)
+        {
+            return obj.table->stream_in(i, &obj.object);
+        }
+
+        friend std::ostream& operator<< (std::ostream& o, hold_any const& obj)
+        {
+            return obj.table->stream_out(o, &obj.object);
+        }
+
+#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
+    private: // types
+        template<typename T>
+        friend T* any_cast(hold_any *);
+#else
+    public: // types (public so any_cast can be non-friend)
+#endif
+        // fields
+        spirit::detail::fxn_ptr_table* table;
+        void* object;
+    };
+
+    // boost::any-like casting
+    template <typename T>
+    inline T* any_cast (hold_any* operand)
+    {
+        if (operand && operand->type() == BOOST_SP_TYPEID(T)) {
+            return spirit::detail::get_table<T>::is_small::value ?
+                reinterpret_cast<T*>(&operand->object) :
+                reinterpret_cast<T*>(operand->object);
+        }
+        return 0;
+    }
+
+    template <typename T>
+    inline T const* any_cast(hold_any const* operand)
+    {
+        return any_cast<T>(const_cast<hold_any*>(operand));
+    }
+
+    template <typename T>
+    T any_cast(hold_any& operand)
+    {
+        typedef BOOST_DEDUCED_TYPENAME remove_reference<T>::type nonref;
+
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+        // If 'nonref' is still reference type, it means the user has not
+        // specialized 'remove_reference'.
+
+        // Please use BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION macro
+        // to generate specialization of remove_reference for your class
+        // See type traits library documentation for details
+        BOOST_STATIC_ASSERT(!is_reference<nonref>::value);
+#endif
+
+        nonref* result = any_cast<nonref>(&operand);
+        if(!result)
+            boost::throw_exception(bad_any_cast(operand.type(), BOOST_SP_TYPEID(T)));
+        return *result;
+    }
+
+    template <typename T>
+    T const& any_cast(hold_any const& operand)
+    {
+        typedef BOOST_DEDUCED_TYPENAME remove_reference<T>::type nonref;
+
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+        // The comment in the above version of 'any_cast' explains when this
+        // assert is fired and what to do.
+        BOOST_STATIC_ASSERT(!is_reference<nonref>::value);
+#endif
+
+        return any_cast<nonref const&>(const_cast<hold_any &>(operand));
+    }
+
+///////////////////////////////////////////////////////////////////////////////
+}}    // namespace boost::spirit
+
+///////////////////////////////////////////////////////////////////////////////
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+# pragma warning(pop)
+#endif
+
+#endif