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

third_party/smartany/scoped_any.h

-//+---------------------------------------------------------------------------
-//
-//  Copyright ( C ) Microsoft, 2002.
-//
-//  File:       scoped_any.h
-//
-//  Contents:   automatic resource management, a-la std::scoped_ptr
-//
-//  Classes:    scoped_any<> and various typedefs
-//
-//  Functions:  get
-//              reset
-//              release
-//              valid
-//              address
-//
-//  Author:     Eric Niebler ( ericne@microsoft.com )
-//
-//----------------------------------------------------------------------------
-
-#ifndef SCOPED_ANY
-#define SCOPED_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 scoped_any_helper
-    template<typename T,class close_policy,class invalid_value,int unique>
-    struct scoped_any_helper;
-}
-
-// wrap a resource to enforce strict ownership and ensure proper cleanup
-template<typename T,class close_policy,class invalid_value,int unique>
-class scoped_any
-{
-    // disallow copy and assignment
-    scoped_any( scoped_any<T,close_policy,invalid_value,unique> const & );
-    scoped_any<T,close_policy,invalid_value,unique> & operator=( 
-        scoped_any<T,close_policy,invalid_value,unique> const & );
-
-    // disallow comparison of scoped_any's
-    bool operator==( detail::safe_bool ) const;
-    bool operator!=( detail::safe_bool ) const;
-
-    typedef detail::safe_types<T,close_policy>  safe_types;
-
-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::scoped_any_helper<T,close_policy,invalid_value,unique>;
-
-    // construct from object pointer
-    explicit scoped_any( T t = invalid_value_type() )
-        : m_t( t )
-    {
-    }
-
-    // destroy the object
-    ~scoped_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 scoped_any appears in a conditional
-    operator detail::safe_bool() const
-    {
-        return valid() ? detail::safe_true : detail::safe_false;
-    }
-
-    // for use when scoped_any appears in a conditional
-    bool operator!() const
-    {
-        return ! valid();
-    }
-
-    #ifdef SMART_ANY_PTS
-    // if this scoped_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:
-    // scoped_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 smart_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 scoped_any_helper
-    template<typename T,class close_policy,class invalid_value,int unique>
-    struct scoped_any_helper
-    {
-        // return wrapped pointer
-        static T get( scoped_any<T,close_policy,invalid_value,unique> const & t )
-        {
-            return t.m_t;
-        }
-
-        // return wrapped pointer and give up ownership
-        static T release( scoped_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( scoped_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 scoped_any<T,close_policy,invalid_value,unique>::element_type element_type;
-
-        // return the address of the wrapped pointer
-        static element_type* address( scoped_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( scoped_any<T,close_policy,invalid_value,unique> const & t )
-{
-    return detail::scoped_any_helper<T,close_policy,invalid_value,unique>::get( t );
-}
-
-// return true if the scoped_any contains a currently valid resource
-template<typename T,class close_policy,class invalid_value,int unique>
-inline bool valid( scoped_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( scoped_any<T,close_policy,invalid_value,unique> & t )
-{
-    return detail::scoped_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( scoped_any<T,close_policy,invalid_value,unique> & t )
-{
-    typedef typename detail::fixup_invalid_value<invalid_value>::
-        template rebind<T>::type invalid_value_type;
-    detail::scoped_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( scoped_any<T,close_policy,invalid_value,unique> & t, U newT )
-{
-    detail::scoped_any_helper<T,close_policy,invalid_value,unique>::reset( t, newT );
-}
-
-// 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 scoped_any<T,close_policy,invalid_value,unique>::element_type* 
-    address( scoped_any<T,close_policy,invalid_value,unique> & t )
-{
-    return detail::scoped_any_helper<T,close_policy,invalid_value,unique>::address( t );
-}
-
-#pragma warning(pop)
-
-#endif
-
-// This causes the scoped_* typedefs to be defined
-DECLARE_SMART_ANY_TYPEDEFS(scoped)
-
-#if defined(_OBJBASE_H_) & !defined(SCOPED_ANY_CO_INIT)
-# define SCOPED_ANY_CO_INIT
-  typedef scoped_any<HRESULT,close_co,co_not_init>                            scoped_co_close;
-
-  // Helper class for balancing calls to CoInitialize and CoUninitialize
-  struct scoped_co_init
-  {
-      explicit scoped_co_init( DWORD dwCoInit = COINIT_APARTMENTTHREADED )
-          : m_hr( smart_co_init_helper( dwCoInit ) )
-      {
-      }
-      HRESULT hresult() const
-      {
-          return get(m_hr);
-      }
-      scoped_co_close const m_hr;
-  };
-#endif