Skip to main content

J.8 Mod Clauses

danger

This Reference Manual output has not been verified, and may contain omissions or errors. Report any problems on the tracking issue

Syntax​

1
mod_clause ::= at mod static_expression;

Static Semantics​

2

A record_representation_clause of the form:

3/3
for r use
    record at mod a;
        ...
    end record;
4

is equivalent to:

5
for r'Alignment use a;
for r use
    record
        ...
    end record;
5.a
reason
The preferred syntax for specifying the alignment of an entity is an attribute_definition_clause specifying the Alignment attribute. Therefore, the special-purpose mod_clause syntax is now obsolete.
5.b
note
The above equivalence implies, for example, that it is illegal to give both a mod_clause and an attribute_definition_clause specifying the Alignment attribute for the same type.

Wording Changes from Ada 83​

5.c
note
Ada 83's alignment_clause is now called a mod_clause to avoid confusion with the new term “Alignment clause” (that is, an attribute_definition_clause for the Alignment attribute).