The Package System.Address_To_Access_Conversions
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

Ada Reference Manual — Legal Information

# 13.7.2 The Package System.Address_To_Access_Conversions

#### Static Semantics

1
The following language-defined generic library package exists:
2
generic
type Object(<>) is limited private;
package System.Address_To_Access_Conversions is
pragma Preelaborate(Address_To_Access_Conversions);
3
type Object_Pointer is access all Object;
function To_Pointer(Value : Address) return Object_Pointer;
function To_Address(Value : Object_Pointer) return Address;
4
pragma Convention(Intrinsic, To_Pointer);
pragma Convention(Intrinsic, To_Address);
end System.Address_To_Access_Conversions;
5/2
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

6
An implementation may place restrictions on instantiations of Address_To_Access_Conversions.

Sponsored by Ada-Europe