<s>
In	O
computer	B-General_Concept
programming	I-General_Concept
,	O
a	O
function	B-Language
object	I-Language
is	O
a	O
construct	O
allowing	O
an	O
object	O
to	O
be	O
invoked	O
or	O
called	O
as	O
if	O
it	O
were	O
an	O
ordinary	O
function	O
,	O
usually	O
with	O
the	O
same	O
syntax	O
(	O
a	O
function	O
parameter	O
that	O
can	O
also	O
be	O
a	O
function	O
)	O
.	O
</s>
<s>
Function	B-Language
objects	I-Language
are	O
often	O
called	O
functors	B-Language
.	O
</s>
<s>
A	O
typical	O
use	O
of	O
a	O
function	B-Language
object	I-Language
is	O
in	O
writing	O
callback	O
functions	O
.	O
</s>
<s>
A	O
callback	O
in	O
procedural	B-Application
languages	I-Application
,	O
such	O
as	O
C	B-Language
,	O
may	O
be	O
performed	O
by	O
using	O
function	B-Language
pointers	I-Language
.	O
</s>
<s>
A	O
function	B-Language
object	I-Language
solves	O
those	O
problems	O
since	O
the	O
function	O
is	O
really	O
a	O
façade	O
for	O
a	O
full	O
object	O
,	O
carrying	O
its	O
own	O
state	O
.	O
</s>
<s>
C++	B-Language
,	O
Eiffel	B-Language
,	O
Groovy	B-Application
,	O
Lisp	B-Language
,	O
Smalltalk	B-Application
,	O
Perl	B-Language
,	O
PHP	B-Application
,	O
Python	B-Language
,	O
Ruby	B-Language
,	O
Scala	B-Application
,	O
and	O
many	O
others	O
,	O
support	O
first-class	B-Application
function	I-Application
objects	O
and	O
may	O
even	O
make	O
significant	O
use	O
of	O
them	O
.	O
</s>
<s>
Functional	B-Language
programming	I-Language
languages	I-Language
additionally	O
support	O
closures	B-Language
,	O
i.e.	O
</s>
<s>
first-class	B-Application
functions	I-Application
that	O
can	O
'	O
close	O
over	O
 '	O
variables	O
in	O
their	O
surrounding	O
environment	O
at	O
creation	O
time	O
.	O
</s>
<s>
During	O
compilation	O
,	O
a	O
transformation	O
known	O
as	O
lambda	B-Application
lifting	I-Application
converts	O
the	O
closures	B-Language
into	O
function	B-Language
objects	I-Language
.	O
</s>
<s>
The	O
following	O
C	B-Language
program	I-Language
uses	O
function	B-Language
pointers	I-Language
:	O
</s>
<s>
In	O
C++	B-Language
,	O
a	O
function	B-Language
object	I-Language
may	O
be	O
used	O
instead	O
of	O
an	O
ordinary	O
function	O
by	O
defining	O
a	O
class	O
that	O
overloads	O
the	O
function	O
call	O
operator	O
by	O
defining	O
an	O
operator( )	O
member	O
function	O
.	O
</s>
<s>
In	O
C++	B-Language
,	O
this	O
may	O
appear	O
as	O
follows	O
:	O
</s>
<s>
Notice	O
that	O
the	O
syntax	O
for	O
providing	O
the	O
callback	O
to	O
the	O
std::sort( )	O
function	O
is	O
identical	O
,	O
but	O
an	O
object	O
is	O
passed	O
instead	O
of	O
a	O
function	B-Language
pointer	I-Language
.	O
</s>
<s>
To	O
understand	O
what	O
power	O
a	O
functor	B-Language
provides	O
more	O
than	O
a	O
regular	O
function	O
,	O
consider	O
the	O
common	O
use	O
case	O
of	O
sorting	O
objects	O
by	O
a	O
particular	O
field	O
.	O
</s>
<s>
In	O
the	O
following	O
example	O
,	O
a	O
functor	B-Language
is	O
used	O
to	O
sort	O
a	O
simple	O
employee	O
database	O
by	O
each	O
employee	O
's	O
ID	O
number	O
.	O
</s>
<s>
In	O
C++11	B-Language
,	O
the	O
lambda	B-General_Concept
expression	I-General_Concept
provides	O
a	O
more	O
succinct	O
way	O
to	O
do	O
the	O
same	O
thing	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
use	O
function	B-Language
objects	I-Language
in	O
situations	O
other	O
than	O
as	O
callback	O
functions	O
.	O
</s>
<s>
In	O
this	O
case	O
,	O
the	O
shortened	O
term	O
functor	B-Language
is	O
normally	O
not	O
used	O
about	O
the	O
function	B-Language
object	I-Language
.	O
</s>
<s>
In	O
addition	O
to	O
class	O
type	O
functors	B-Language
,	O
other	O
kinds	O
of	O
function	B-Language
objects	I-Language
are	O
also	O
possible	O
in	O
C++	B-Language
.	O
</s>
<s>
They	O
can	O
take	O
advantage	O
of	O
C++'s	O
member-pointer	O
or	O
template	B-Language
facilities	O
.	O
</s>
<s>
The	O
expressiveness	O
of	O
templates	O
allows	O
some	O
functional	B-Language
programming	I-Language
techniques	O
to	O
be	O
used	O
,	O
such	O
as	O
defining	O
function	B-Language
objects	I-Language
in	O
terms	O
of	O
other	O
function	B-Language
objects	I-Language
(	O
like	O
function	B-Application
composition	I-Application
)	O
.	O
</s>
<s>
Much	O
of	O
the	O
C++	B-Language
Standard	B-Application
Template	I-Application
Library	I-Application
(	O
STL	O
)	O
makes	O
heavy	O
use	O
of	O
template-based	O
function	B-Language
objects	I-Language
.	O
</s>
<s>
Another	O
advantage	O
of	O
function	B-Language
objects	I-Language
is	O
their	O
ability	O
to	O
maintain	O
a	O
state	O
that	O
affects	O
operator( )	O
between	O
calls	O
.	O
</s>
<s>
In	O
C++14	O
or	O
later	O
,	O
the	O
example	O
above	O
could	O
be	O
rewritten	O
as	O
:	O
</s>
<s>
In	O
C#	B-Application
,	O
function	B-Language
objects	I-Language
are	O
declared	O
via	O
delegates	O
.	O
</s>
<s>
A	O
delegate	O
can	O
be	O
declared	O
using	O
a	O
named	O
method	O
or	O
a	O
lambda	B-General_Concept
expression	I-General_Concept
.	O
</s>
<s>
Here	O
is	O
an	O
example	O
using	O
a	O
lambda	B-General_Concept
expression	I-General_Concept
.	O
</s>
<s>
D	B-Application
provides	O
several	O
ways	O
to	O
declare	O
function	B-Language
objects	I-Language
:	O
Lisp/Python	O
-style	O
via	O
closures	B-Language
or	O
C#	B-Application
-style	O
via	O
delegates	O
,	O
respectively	O
:	O
</s>
<s>
The	O
difference	O
between	O
a	O
delegate	O
and	O
a	O
closure	B-Language
in	O
D	B-Application
is	O
automatically	O
and	O
conservatively	O
determined	O
by	O
the	O
compiler	O
.	O
</s>
<s>
D	B-Application
also	O
supports	O
function	B-General_Concept
literals	I-General_Concept
,	O
that	O
allow	O
a	O
lambda-style	O
definition	O
:	O
</s>
<s>
To	O
allow	O
the	O
compiler	O
to	O
inline	O
the	O
code	O
(	O
see	O
above	O
)	O
,	O
function	B-Language
objects	I-Language
can	O
also	O
be	O
specified	O
C++	B-Language
-style	O
via	O
operator	O
overloading	O
:	O
</s>
<s>
In	O
the	O
Eiffel	B-Language
software	O
development	O
method	O
and	O
language	O
,	O
operations	O
and	O
objects	O
are	O
seen	O
always	O
as	O
separate	O
concepts	O
.	O
</s>
<s>
Agents	O
satisfy	O
the	O
range	O
of	O
application	O
attributed	O
to	O
function	B-Language
objects	I-Language
,	O
such	O
as	O
being	O
passed	O
as	O
arguments	O
in	O
procedural	B-Application
calls	O
or	O
specified	O
as	O
callback	O
routines	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
agent	O
mechanism	O
in	O
Eiffel	B-Language
attempts	O
to	O
reflect	O
the	O
object-oriented	O
nature	O
of	O
the	O
method	O
and	O
language	O
.	O
</s>
<s>
An	O
agent	O
is	O
an	O
object	O
that	O
generally	O
is	O
a	O
direct	O
instance	O
of	O
one	O
of	O
the	O
two	O
library	O
classes	O
,	O
which	O
model	O
the	O
two	O
types	O
of	O
routines	O
in	O
Eiffel	B-Language
:	O
PROCEDURE	O
and	O
FUNCTION	O
.	O
</s>
<s>
The	O
routine	O
extend	O
referenced	O
in	O
the	O
example	O
above	O
is	O
a	O
feature	O
of	O
a	O
class	O
in	O
a	O
graphical	O
user	O
interface	O
(	O
GUI	O
)	O
library	O
to	O
provide	O
event-driven	B-Application
programming	I-Application
capabilities	O
.	O
</s>
<s>
The	O
Eiffel	B-Language
agent	O
mechanism	O
is	O
detailed	O
in	O
the	O
.	O
</s>
<s>
Java	B-Language
has	O
no	O
first-class	B-Application
functions	I-Application
,	O
so	O
function	B-Language
objects	I-Language
are	O
usually	O
expressed	O
by	O
an	O
interface	O
with	O
a	O
single	O
method	O
(	O
most	O
commonly	O
the	O
Callable	O
interface	O
)	O
,	O
typically	O
with	O
the	O
implementation	O
being	O
an	O
anonymous	B-Language
inner	I-Language
class	I-Language
,	O
or	O
,	O
starting	O
in	O
Java	B-Language
8	O
,	O
a	O
lambda	B-General_Concept
.	O
</s>
<s>
For	O
an	O
example	O
from	O
Java	B-Language
's	O
standard	O
library	O
,	O
java.util.Collections.sort( )	O
takes	O
a	O
List	O
and	O
a	O
functor	B-Language
whose	O
role	O
is	O
to	O
compare	O
objects	O
in	O
the	O
List	O
.	O
</s>
<s>
Without	O
first-class	B-Application
functions	I-Application
,	O
the	O
function	O
is	O
part	O
of	O
the	O
Comparator	O
interface	O
.	O
</s>
<s>
In	O
Java	B-Language
8+	O
,	O
this	O
can	O
be	O
written	O
as	O
:	O
</s>
<s>
In	O
JavaScript	B-Language
,	O
functions	O
are	O
first	O
class	O
objects	O
.	O
</s>
<s>
JavaScript	B-Language
also	O
supports	O
closures	B-Language
.	O
</s>
<s>
Compare	O
the	O
following	O
with	O
the	O
subsequent	O
Python	B-Language
example	O
.	O
</s>
<s>
An	O
example	O
is	O
this	O
accumulator	O
mutable	O
struct	B-Application
(	O
based	O
on	O
Paul	O
Graham	O
's	O
study	O
on	O
programming	O
language	O
syntax	O
and	O
clarity	O
)	O
:	O
</s>
<s>
Such	O
an	O
accumulator	O
can	O
also	O
be	O
implemented	O
using	O
closure	B-Language
:	O
</s>
<s>
In	O
Lisp	B-Language
family	O
languages	O
such	O
as	O
Common	B-Language
Lisp	I-Language
,	O
Scheme	B-Language
,	O
and	O
others	O
,	O
functions	O
are	O
objects	O
,	O
just	O
like	O
strings	O
,	O
vectors	O
,	O
lists	O
,	O
and	O
numbers	O
.	O
</s>
<s>
A	O
closure-constructing	O
operator	O
creates	O
a	O
function	B-Language
object	I-Language
from	O
a	O
part	O
of	O
the	O
program	O
:	O
the	O
part	O
of	O
code	O
given	O
as	O
an	O
argument	O
to	O
the	O
operator	O
is	O
part	O
of	O
the	O
function	O
,	O
and	O
so	O
is	O
the	O
lexical	O
environment	O
:	O
the	O
bindings	O
of	O
the	O
lexically	O
visible	O
variables	O
are	O
captured	O
and	O
stored	O
in	O
the	O
function	B-Language
object	I-Language
,	O
which	O
is	O
more	O
commonly	O
called	O
a	O
closure	B-Language
.	O
</s>
<s>
The	O
captured	O
bindings	O
play	O
the	O
role	O
of	O
member	O
variables	O
,	O
and	O
the	O
code	O
part	O
of	O
the	O
closure	B-Language
plays	O
the	O
role	O
of	O
the	O
anonymous	O
member	O
function	O
,	O
just	O
like	O
operator	O
(	O
)	O
in	O
C++	B-Language
.	O
</s>
<s>
The	O
closure	B-Language
constructor	O
has	O
the	O
syntax	O
(	O
lambda	B-General_Concept
(	O
parameters	O
...	O
)	O
code	O
...	O
)	O
.	O
</s>
<s>
The	O
code	O
...	O
part	O
consists	O
of	O
expressions	O
that	O
are	O
evaluated	O
when	O
the	O
functor	B-Language
is	O
called	O
.	O
</s>
<s>
Many	O
uses	O
of	O
functors	B-Language
in	O
languages	O
like	O
C++	B-Language
are	O
simply	O
emulations	O
of	O
the	O
missing	O
closure	B-Language
constructor	O
.	O
</s>
<s>
Since	O
the	O
programmer	O
cannot	O
directly	O
construct	O
a	O
closure	B-Language
,	O
they	O
must	O
define	O
a	O
class	O
that	O
has	O
all	O
of	O
the	O
necessary	O
state	O
variables	O
,	O
and	O
also	O
a	O
member	O
function	O
.	O
</s>
<s>
The	O
values	O
are	O
derived	O
precisely	O
from	O
those	O
local	O
variables	O
that	O
ought	O
to	O
be	O
captured	O
directly	O
by	O
a	O
closure	B-Language
.	O
</s>
<s>
A	O
function-object	O
using	O
the	O
class	O
system	O
,	O
no	O
use	O
of	O
closures	B-Language
:	O
</s>
<s>
Since	O
there	O
is	O
no	O
standard	O
way	O
to	O
make	O
funcallable	O
objects	O
in	O
Lisp	B-Language
,	O
we	O
fake	O
it	O
by	O
defining	O
a	O
generic	O
function	O
called	O
FUNCTOR-CALL	O
.	O
</s>
<s>
The	O
standard	O
FUNCALL	O
function	O
is	O
not	O
generic	O
;	O
it	O
only	O
takes	O
function	B-Language
objects	I-Language
.	O
</s>
<s>
It	O
is	O
this	O
FUNCTOR-CALL	O
generic	O
function	O
that	O
gives	O
us	O
function	B-Language
objects	I-Language
,	O
which	O
are	O
a	O
computer	B-General_Concept
programming	I-General_Concept
construct	O
allowing	O
an	O
object	O
to	O
be	O
invoked	O
or	O
called	O
as	O
if	O
it	O
were	O
an	O
ordinary	O
function	O
,	O
usually	O
with	O
the	O
same	O
syntax	O
.	O
</s>
<s>
We	O
have	O
almost	O
the	O
same	O
syntax	O
:	O
FUNCTOR-CALL	O
instead	O
of	O
FUNCALL	O
.	O
</s>
<s>
Some	O
Lisps	B-Language
provide	O
funcallable	O
objects	O
as	O
a	O
simple	O
extension	O
.	O
</s>
<s>
Making	O
a	O
function	O
call	O
operator	O
work	O
with	O
different	O
kinds	O
of	O
function	O
things	O
,	O
whether	O
they	O
be	O
class	O
objects	O
or	O
closures	B-Language
is	O
no	O
more	O
complicated	O
than	O
making	O
a	O
+	O
operator	O
that	O
works	O
with	O
different	O
kinds	O
of	O
numbers	O
,	O
such	O
as	O
integers	O
,	O
reals	O
or	O
complex	O
numbers	O
.	O
</s>
<s>
Now	O
,	O
a	O
counter	O
implemented	O
using	O
a	O
closure	B-Language
.	O
</s>
<s>
The	O
INITIAL-VALUE	O
argument	O
of	O
the	O
MAKE-COUNTER	O
factory	B-Application
function	I-Application
is	O
captured	O
and	O
used	O
directly	O
.	O
</s>
<s>
Scheme	B-Language
makes	O
closures	B-Language
even	O
simpler	O
,	O
and	O
Scheme	B-Language
code	O
tends	O
to	O
use	O
such	O
higher-order	O
programming	O
somewhat	O
more	O
idiomatically	O
.	O
</s>
<s>
More	O
than	O
one	O
closure	B-Language
can	O
be	O
created	O
in	O
the	O
same	O
lexical	O
environment	O
.	O
</s>
<s>
A	O
vector	O
of	O
closures	B-Language
,	O
each	O
implementing	O
a	O
specific	O
kind	O
of	O
operation	O
,	O
can	O
quite	O
faithfully	O
emulate	O
an	O
object	O
that	O
has	O
a	O
set	O
of	O
virtual	O
operations	O
.	O
</s>
<s>
That	O
type	O
of	O
single	O
dispatch	O
object-oriented	O
programming	O
can	O
be	O
done	O
fully	O
with	O
closures	B-Language
.	O
</s>
<s>
Programmers	O
in	O
OOP	O
languages	O
discover	O
function	B-Language
objects	I-Language
by	O
restricting	O
objects	O
to	O
have	O
one	O
main	O
function	O
to	O
do	O
that	O
object	O
's	O
functional	O
purpose	O
,	O
and	O
even	O
eliminate	O
its	O
name	O
so	O
that	O
it	O
looks	O
like	O
the	O
object	O
is	O
being	O
called	O
!	O
</s>
<s>
While	O
programmers	O
who	O
use	O
closures	B-Language
are	O
not	O
surprised	O
that	O
an	O
object	O
is	O
called	O
like	O
a	O
function	O
,	O
they	O
discover	O
that	O
multiple	O
closures	B-Language
sharing	O
the	O
same	O
environment	O
can	O
provide	O
a	O
complete	O
set	O
of	O
abstract	O
operations	O
like	O
a	O
virtual	O
table	O
for	O
single	O
dispatch	O
type	O
OOP	O
.	O
</s>
<s>
In	O
Objective-C	B-Language
,	O
a	O
function	B-Language
object	I-Language
can	O
be	O
created	O
from	O
the	O
NSInvocation	O
class	O
.	O
</s>
<s>
Construction	O
of	O
a	O
function	B-Language
object	I-Language
requires	O
a	O
method	O
signature	O
,	O
the	O
target	O
object	O
,	O
and	O
the	O
target	O
selector	O
.	O
</s>
<s>
In	O
Perl	B-Language
,	O
a	O
function	B-Language
object	I-Language
can	O
be	O
created	O
either	O
from	O
a	O
class	O
's	O
constructor	O
returning	O
a	O
function	O
closed	O
over	O
the	O
object	O
's	O
instance	O
data	O
,	O
blessed	O
into	O
the	O
class	O
:	O
</s>
<s>
In	O
both	O
cases	O
the	O
function	B-Language
object	I-Language
can	O
be	O
used	O
either	O
using	O
the	O
dereferencing	O
arrow	O
syntax	O
$ref->(@arguments )	O
:	O
</s>
<s>
PHP	B-Application
5.3	O
+	O
has	O
first-class	B-Application
functions	I-Application
that	O
can	O
be	O
used	O
e.g.	O
</s>
<s>
PHP	B-Application
5.3	O
+	O
,	O
supports	O
also	O
lambda	B-General_Concept
functions	I-General_Concept
and	O
closures	B-Language
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
in	O
PHP	B-Application
5.3	O
+	O
to	O
make	O
objects	O
invokable	O
by	O
adding	O
a	O
magic	O
__invoke( )	O
method	O
to	O
their	O
class	O
:	O
</s>
<s>
In	O
the	O
Windows	B-Application
PowerShell	I-Application
language	O
,	O
a	O
script	O
block	O
is	O
a	O
collection	O
of	O
statements	O
or	O
expressions	O
that	O
can	O
be	O
used	O
as	O
a	O
single	O
unit	O
.	O
</s>
<s>
A	O
script	O
block	O
is	O
an	O
instance	O
of	O
a	O
Microsoft	B-Application
.NET	I-Application
Framework	I-Application
type	O
System.Management.Automation.ScriptBlock	O
.	O
</s>
<s>
In	O
Python	B-Language
,	O
functions	O
are	O
first-class	O
objects	O
,	O
just	O
like	O
strings	O
,	O
numbers	O
,	O
lists	O
etc	O
.	O
</s>
<s>
This	O
feature	O
eliminates	O
the	O
need	O
to	O
write	O
a	O
function	B-Language
object	I-Language
in	O
many	O
cases	O
.	O
</s>
<s>
In	O
Ruby	B-Language
,	O
several	O
objects	O
can	O
be	O
considered	O
function	B-Language
objects	I-Language
,	O
in	O
particular	O
Method	O
and	O
Proc	O
objects	O
.	O
</s>
<s>
Ruby	B-Language
also	O
has	O
two	O
kinds	O
of	O
objects	O
that	O
can	O
be	O
thought	O
of	O
as	O
semi-function	O
objects	O
:	O
UnboundMethod	O
and	O
block	O
.	O
</s>
<s>
UnboundMethods	O
must	O
first	O
be	O
bound	O
to	O
an	O
object	O
(	O
thus	O
becoming	O
a	O
Method	O
)	O
before	O
they	O
can	O
be	O
used	O
as	O
a	O
function	B-Language
object	I-Language
.	O
</s>
<s>
Blocks	O
can	O
be	O
called	O
like	O
function	B-Language
objects	I-Language
,	O
but	O
to	O
be	O
used	O
in	O
any	O
other	O
capacity	O
as	O
an	O
object	O
(	O
e.g.	O
</s>
<s>
Now	O
,	O
method	O
foo	O
can	O
be	O
a	O
function	B-Language
object	I-Language
,	O
i.e.	O
</s>
<s>
Symbol.to_proc	O
was	O
officially	O
added	O
to	O
Ruby	B-Language
on	O
June	O
11	O
,	O
2006	O
during	O
RubyKaigi2006	O
.	O
</s>
<s>
Because	O
of	O
the	O
variety	O
of	O
forms	O
,	O
the	O
term	O
Functor	B-Language
is	O
not	O
generally	O
used	O
in	O
Ruby	B-Language
to	O
mean	O
a	O
Function	B-Language
object	I-Language
.	O
</s>
<s>
Just	O
a	O
type	O
of	O
dispatch	O
delegation	O
introduced	O
by	O
the	O
project	O
is	O
named	O
as	O
Functor	B-Language
.	O
</s>
<s>
This	O
usage	O
is	O
more	O
akin	O
to	O
that	O
used	O
by	O
functional	B-Language
programming	I-Language
languages	I-Language
,	O
like	O
ML	B-Language
,	O
and	O
the	O
original	O
mathematical	O
terminology	O
.	O
</s>
<s>
In	O
a	O
more	O
theoretical	O
context	O
a	O
function	B-Language
object	I-Language
may	O
be	O
considered	O
to	O
be	O
any	O
instance	O
of	O
the	O
class	O
of	O
functions	O
,	O
especially	O
in	O
languages	O
such	O
as	O
Common	B-Language
Lisp	I-Language
in	O
which	O
functions	O
are	O
first-class	O
objects	O
.	O
</s>
<s>
The	O
ML	B-Language
family	O
of	O
functional	B-Language
programming	I-Language
languages	I-Language
uses	O
the	O
term	O
functor	B-Language
to	O
represent	O
a	O
mapping	O
from	O
modules	O
to	O
modules	O
,	O
or	O
from	O
types	O
to	O
types	O
and	O
is	O
a	O
technique	O
for	O
reusing	O
code	O
.	O
</s>
<s>
Functors	B-Language
used	O
in	O
this	O
manner	O
are	O
analogous	O
to	O
the	O
original	O
mathematical	O
meaning	O
of	O
functor	B-Language
in	O
category	O
theory	O
,	O
or	O
to	O
the	O
use	O
of	O
generic	B-Language
programming	I-Language
in	O
C++	B-Language
,	O
Java	B-Language
or	O
Ada	B-Language
.	O
</s>
<s>
In	O
Haskell	B-Language
,	O
the	O
term	O
functor	B-Language
is	O
also	O
used	O
for	O
a	O
concept	O
related	O
to	O
the	O
meaning	O
of	O
functor	B-Language
in	O
category	O
theory	O
.	O
</s>
<s>
In	O
Prolog	B-Language
and	O
related	O
languages	O
,	O
functor	B-Language
is	O
a	O
synonym	O
for	O
function	B-Language
symbol	I-Language
.	O
</s>
