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13.7.2 The Package System.Address_To_Access_Conversions

Static Semantics

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The following language-defined generic library package exists: 
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generic
   type Object(<>) is limited private;
package System.Address_To_Access_Conversions 
   with Preelaborate, Nonblocking, Global => in out synchronized is
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   type Object_Pointer is access all Object;
   function To_Pointer(Value : Address) return Object_Pointer
      with Convention => Intrinsic;
   function To_Address(Value : Object_Pointer) return Address
      with Convention => Intrinsic;
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end System.Address_To_Access_Conversions;
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The To_Pointer and To_Address subprograms convert back and forth between values of types Object_Pointer and Address. To_Pointer(X'Address) is equal to X'Unchecked_Access for any X that allows Unchecked_Access. To_Pointer(Null_Address) returns null. For other addresses, the behavior is unspecified. To_Address(null) returns Null_Address. To_Address(Y), where Y /= null, returns Y.all'Address. 

Implementation Permissions

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An implementation may place restrictions on instantiations of Address_To_Access_Conversions. 
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