Keep only base/extractor.[cc|h].

third_party/smartany/auto_any.h

-//+---------------------------------------------------------------------------
-//
-//  Copyright ( C ) Microsoft, 2002.
-//
-//  File:       auto_any.h
-//
-//  Contents:   automatic resource management, a-la std::auto_ptr
-//
-//  Classes:    auto_any<> and various typedefs
-//
-//  Functions:  get
-//              reset
-//              release
-//              valid
-//              address
-//
-//  Author:     Eric Niebler ( ericne@microsoft.com )
-//
-//----------------------------------------------------------------------------
-
-#ifndef AUTO_ANY
-#define AUTO_ANY
-#include <cassert>
-#include "smart_any_fwd.h"
-
-#pragma warning(push)
-
-// 4284 warning for operator-> returning non-pointer;
-//      compiler issues it even if -> is not used for the specific instance
-#pragma warning(disable: 4284) 
-
-namespace detail
-{
-    // friend function definitions go in auto_any_helper
-    template<typename T,class close_policy,class invalid_value,int unique>
-    struct auto_any_helper;
-}
-
-// proxy reference for auto_any copying
-template<typename T,class close_policy,class invalid_value,int unique>
-struct auto_any_ref
-{
-    // construct from compatible auto_any
-    auto_any_ref( auto_any<T,close_policy,invalid_value,unique> & that )
-        : m_that( that )
-    {
-    }
-
-    // reference to constructor argument
-    auto_any<T,close_policy,invalid_value,unique> & m_that;
-
-private:
-    auto_any_ref * operator=( auto_any_ref const & );
-};
-
-// wrap a resource to enforce strict ownership and ensure proper cleanup
-template<typename T,class close_policy,class invalid_value,int unique>
-class auto_any
-{
-    typedef detail::safe_types<T,close_policy>  safe_types;
-
-    // disallow comparison of auto_any's
-    bool operator==( detail::safe_bool ) const;
-    bool operator!=( detail::safe_bool ) const;
-
-public:
-    typedef typename detail::holder<T>::type    element_type;
-    typedef close_policy                        close_policy_type;
-    typedef typename safe_types::pointer_type   pointer_type;
-    typedef typename safe_types::reference_type reference_type;
-
-    // Fix-up the invalid_value type on older compilers
-    typedef typename detail::fixup_invalid_value<invalid_value>::
-        template rebind<T>::type invalid_value_type;
-
-    friend struct detail::auto_any_helper<T,close_policy,invalid_value,unique>;
-
-    // construct from object pointer
-    explicit auto_any( T t = invalid_value_type() )
-        : m_t( t )
-    {
-    }
-
-    // construct by assuming pointer from right auto_any
-    auto_any( auto_any<T,close_policy,invalid_value,unique> & right )
-        : m_t( release( right ) )
-    {
-    }
-
-    // construct by assuming pointer from right auto_any_ref
-    auto_any( auto_any_ref<T,close_policy,invalid_value,unique> right )
-        : m_t( release( right.m_that ) )
-    {
-    }
-
-    // convert to compatible auto_any_ref
-    operator auto_any_ref<T,close_policy,invalid_value,unique>()
-    {
-        return auto_any_ref<T,close_policy,invalid_value,unique>( *this );
-    }
-
-    // assign compatible right
-    auto_any<T,close_policy,invalid_value,unique> & operator=( 
-        auto_any<T,close_policy,invalid_value,unique> & right )
-    {
-        reset( *this, release( right ) );
-        return *this;
-    }
-
-    // assign compatible right.ref
-    auto_any<T,close_policy,invalid_value,unique> & operator=( 
-        auto_any_ref<T,close_policy,invalid_value,unique> & right )
-    {
-        reset( *this, release( right.m_that ) );
-        return *this;
-    }
-
-    // destroy the object
-    ~auto_any()
-    {
-        if( valid() )
-        {
-            close_policy::close( m_t );
-        }
-    }
-
-    // return pointer to class object (assume pointer)
-    pointer_type operator->() const
-    {
-        #ifdef SMART_ANY_PTS
-        // You better not be applying operator-> to a handle!
-        static detail::static_assert<!detail::is_handle<T>::value> const cannot_dereference_a_handle;
-        #endif
-        assert( valid() );
-        return safe_types::to_pointer( m_t );
-    }
-
-    // for use when auto_any appears in a conditional
-    operator detail::safe_bool() const
-    {
-        return valid() ? detail::safe_true : detail::safe_false;
-    }
-
-    // for use when auto_any appears in a conditional
-    bool operator!() const
-    {
-        return ! valid();
-    }
-
-    #ifdef SMART_ANY_PTS
-    // if this auto_any is managing an array, we can use operator[] to index it
-    typename detail::deref<T>::type operator[]( int i ) const
-    {
-        static detail::static_assert<!detail::is_handle<T>::value> const cannot_dereference_a_handle;
-        static detail::static_assert<!detail::is_delete<close_policy>::value> const accessed_like_an_array_but_not_deleted_like_an_array;
-        assert( valid() );
-        return m_t[ i ];
-    }
-
-    // unary operator* lets you write code like:
-    // auto_any<foo*,close_delete> pfoo( new foo );
-    // foo & f = *pfoo;
-    reference_type operator*() const
-    {
-        static detail::static_assert<!detail::is_handle<T>::value> const cannot_dereference_a_handle;
-        assert( valid() );
-        return safe_types::to_reference( m_t );
-    }
-    #endif
-
-private:
-
-    bool valid() const
-    {
-        // see if the managed resource is in the invalid state.
-        return m_t != static_cast<T>( invalid_value_type() );
-    }
-
-    // the wrapped object
-    element_type m_t;
-};
-
-namespace detail
-{
-    // friend function definitions go in auto_any_helper
-    template<typename T,class close_policy,class invalid_value,int unique>
-    struct auto_any_helper
-    {
-        // return wrapped pointer
-        static T get( auto_any<T,close_policy,invalid_value,unique> const & t )
-        {
-            return t.m_t;
-        }
-
-        // return wrapped pointer and give up ownership
-        static T release( auto_any<T,close_policy,invalid_value,unique> & t )
-        {
-            // Fix-up the invalid_value type on older compilers
-            typedef typename detail::fixup_invalid_value<invalid_value>::
-                template rebind<T>::type invalid_value_type;
-
-            T tmpT = t.m_t;
-            t.m_t = static_cast<T>( invalid_value_type() );
-            return tmpT;
-        }
-
-        // destroy designated object and store new pointer
-        static void reset( auto_any<T,close_policy,invalid_value,unique> & t, T newT )
-        {
-            if( t.m_t != newT )
-            {
-                if( t.valid() )
-                {
-                    close_policy::close( t.m_t );
-                }
-                t.m_t = newT;
-            }
-        }
-
-        typedef typename auto_any<T,close_policy,invalid_value,unique>::element_type element_type;
-
-        // return the address of the wrapped pointer
-        static element_type* address( auto_any<T,close_policy,invalid_value,unique> & t )
-        {
-            // check to make sure the wrapped object is in the invalid state
-            assert( !t.valid() );
-            return address_of( t.m_t );
-        }
-    };
-}
-
-// return wrapped resource
-template<typename T,class close_policy,class invalid_value,int unique>
-inline T get( auto_any<T,close_policy,invalid_value,unique> const & t )
-{
-    return detail::auto_any_helper<T,close_policy,invalid_value,unique>::get( t );
-}
-
-// return true if the auto_any contains a currently valid resource
-template<typename T,class close_policy,class invalid_value,int unique>
-inline bool valid( auto_any<T,close_policy,invalid_value,unique> const & t )
-{
-    return t;
-}
-
-// return wrapped resource and give up ownership
-template<typename T,class close_policy,class invalid_value,int unique>
-inline T release( auto_any<T,close_policy,invalid_value,unique> & t )
-{
-    return detail::auto_any_helper<T,close_policy,invalid_value,unique>::release( t );
-}
-
-// destroy designated object and store new resource
-template<typename T,class close_policy,class invalid_value,int unique>
-inline void reset( auto_any<T,close_policy,invalid_value,unique> & t )
-{
-    typedef typename detail::fixup_invalid_value<invalid_value>::
-        template rebind<T>::type invalid_value_type;
-    detail::auto_any_helper<T,close_policy,invalid_value,unique>::reset( t, invalid_value_type() );
-}
-
-// destroy designated object and store new resource
-template<typename T,class close_policy,class invalid_value,int unique,typename U>
-inline void reset( auto_any<T,close_policy,invalid_value,unique> & t, U newT )
-{
-    detail::auto_any_helper<T,close_policy,invalid_value,unique>::reset( t, newT );
-}
-
-// swap the contents of two shared_any objects
-template<typename T,class close_policy,class invalid_value,int unique>
-void swap( auto_any<T,close_policy,invalid_value,unique> & left, 
-           auto_any<T,close_policy,invalid_value,unique> & right )
-{
-    auto_any<T,close_policy,invalid_value,unique> tmp( left );
-    left = right;
-    right = tmp;
-}
-
-// return the address of the wrapped resource
-// WARNING: this will assert if the value of the resource is
-// anything other than invalid_value.
-template<typename T,class close_policy,class invalid_value,int unique>
-inline typename auto_any<T,close_policy,invalid_value,unique>::element_type* 
-    address( auto_any<T,close_policy,invalid_value,unique> & t )
-{
-    return detail::auto_any_helper<T,close_policy,invalid_value,unique>::address( t );
-}
-
-#pragma warning(pop)
-
-#endif
-
-// This causes the auto_* typedefs to be defined
-DECLARE_SMART_ANY_TYPEDEFS(auto)
-
-#if defined(_OBJBASE_H_) & !defined(AUTO_ANY_CO_INIT)
-# define AUTO_ANY_CO_INIT
-  typedef auto_any<HRESULT,close_co,co_not_init>                            auto_co_close;
-
-  // Helper class for balancing calls to CoInitialize and CoUninitialize
-  struct auto_co_init
-  {
-      explicit auto_co_init( DWORD dwCoInit = COINIT_APARTMENTTHREADED )
-          : m_hr( smart_co_init_helper( dwCoInit ) )
-      {
-      }
-      HRESULT hresult() const
-      {
-          return get(m_hr);
-      }
-      auto_co_close const m_hr;
-  private:
-      auto_co_init & operator=( auto_co_init const & );
-  };
-#endif