Ada Programming/Attributes/'Address

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Description

X'Address is an Ada attribute where X is any object, program unit, or label, RM 13.3(10/1). [A program unit is either a package, a task unit, a protected unit, a protected entry, a generic unit, or an explicitly declared subprogram other than an enumeration literal, RM 10.1(1).]

'Address may be used to return the address of the first element allocated to X. 'Address may also be used to set the address of X for stand-alone objects and program units, RM 13.3(12).

Example

   -- A 32 bit hardware register
   Device_Input_Value: Interfaces.Unsigned_32;
   for Device_Input_Value'Address use To_Address (16#8000_05C4#);

It's not recommended to use Integer_32 in this case.

See also

Wikibook

• Ada Programming
• Ada Programming/Attributes
• Ada Programming/Attributes/'Alignment

Ada Reference Manual

• 13.3 Operational and Representation Attributes (Annotated)
• Annex K Language-Defined Attributes (Annotated)