Reason: The preferred syntax for specifying
the address of an entity is an attribute_definition_clause
specifying the Address attribute. Therefore, the special-purpose at_clause
syntax is now obsolete.
The above equivalence implies, for example,
that only one at_clause
is allowed for a given entity. Similarly, it is illegal to give both
an at_clause
and an attribute_definition_clause
specifying the Address attribute.
{extensions to Ada 83} We
now allow to define the address of an entity using an attribute_definition_clause.
This is because Ada 83's at_clause
is so hard to remember: programmers often tend to write “for X'Address
use...;”.
Ada 83's address_clause
is now called an at_clause
to avoid confusion with the new term “Address clause” (that
is, an attribute_definition_clause
for the Address attribute).
Sponsored by Ada-Europe