<s>
X	B-Language
macros	I-Language
are	O
a	O
technique	O
for	O
reliable	O
maintenance	O
of	O
parallel	O
lists	O
of	O
code	O
and/or	O
data	O
,	O
whose	O
corresponding	O
items	O
must	O
be	O
declared	O
or	O
executed	O
in	O
the	O
same	O
order	O
.	O
</s>
<s>
They	O
are	O
most	O
useful	O
where	O
at	O
least	O
some	O
of	O
the	O
lists	O
cannot	O
be	O
composed	O
by	O
indexing	O
,	O
such	O
as	O
compile	B-Application
time	I-Application
.	O
</s>
<s>
Usage	O
of	O
X	B-Language
macros	I-Language
dates	O
back	O
to	O
the	O
1960s	O
.	O
</s>
<s>
It	O
remains	O
useful	O
also	O
in	O
modern-day	O
C	B-Language
and	O
C++	B-Language
programming	I-Language
languages	I-Language
,	O
but	O
remains	O
relatively	O
unknown	O
.	O
</s>
<s>
An	O
X	B-Language
macro	I-Language
application	O
consists	O
of	O
two	O
parts	O
:	O
</s>
<s>
When	O
run	O
through	O
the	O
C	B-Language
preprocessor	I-Language
,	O
the	O
following	O
code	O
is	O
generated	O
.	O
</s>
<s>
This	O
example	O
aims	O
to	O
improve	O
the	O
readability	O
of	O
the	O
X	B-Language
macro	I-Language
usage	O
by	O
:	O
</s>
<s>
Use	O
the	O
syntax	O
for	O
variadic	B-Language
macro	I-Language
arguments	O
"	O
...	O
"	O
in	O
the	O
worker	O
macros	O
to	O
be	O
able	O
to	O
accept	O
more	O
arguments	O
than	O
needed	O
.	O
</s>
