<s>
Standard	B-Application
ML	I-Application
of	I-Application
New	I-Application
Jersey	I-Application
(	O
SML/NJ	B-Application
;	O
Standard	B-Application
Meta-Language	I-Application
of	I-Application
New	I-Application
Jersey	I-Application
)	O
is	O
a	O
free	B-License
and	I-License
open-source	I-License
compiler	B-Language
and	O
programming	O
environment	O
for	O
the	O
Standard	B-Language
ML	I-Language
programming	O
language	O
.	O
</s>
<s>
Aside	O
from	O
its	O
runtime	B-Device
system	I-Device
,	O
which	O
is	O
written	O
in	O
C	B-Language
,	O
SML/NJ	B-Application
is	O
written	O
in	O
Standard	B-Language
ML	I-Language
.	O
</s>
<s>
Its	O
name	O
is	O
a	O
reference	O
both	O
to	O
the	O
American	O
state	O
of	O
New	O
Jersey	O
in	O
which	O
Princeton	O
and	O
Bell	O
Labs	O
are	O
located	O
and	O
to	O
Standard	O
Oil	O
of	O
New	O
Jersey	O
,	O
the	O
famous	O
oil	O
monopoly	B-Application
of	O
the	O
early	O
20th	O
century	O
.	O
</s>
<s>
SML/NJ	B-Application
extends	O
the	O
SML'97	O
Basis	O
Library	O
with	O
several	O
additional	O
top-level	O
structures	O
:	O
</s>
<s>
System	O
info	O
–	O
the	O
SysInfo	O
structure	O
provides	O
information	O
about	O
the	O
runtime	B-Device
system	I-Device
,	O
such	O
as	O
the	O
operating	B-General_Concept
system	I-General_Concept
kind	O
,	O
type	O
and	O
version	O
and	O
whether	O
or	O
not	O
the	O
machine	O
supports	O
multiprocessing	B-Operating_System
.	O
</s>
<s>
Weak	B-General_Concept
pointers	I-General_Concept
–	O
the	O
Weak	O
structure	O
provides	O
support	O
for	O
weak	B-General_Concept
pointers	I-General_Concept
.	O
</s>
<s>
Compiler	B-Language
internals	O
–	O
the	O
Internals	O
structure	O
provides	O
access	O
to	O
several	O
of	O
the	O
compiler	B-Language
internals	O
,	O
including	O
methods	O
to	O
instantiate	O
and	O
modify	O
the	O
signal	O
table	O
.	O
</s>
<s>
Visible	O
compiler	B-Language
structures	O
–	O
SML/NJ	B-Application
also	O
includes	O
structures	O
that	O
provide	O
access	O
to	O
the	O
ML	O
compiler	B-Language
,	O
which	O
contains	O
substructures	O
for	O
execution	O
profiling	O
,	O
control	O
of	O
compiler	B-Language
error-message	O
printing	O
and	O
warnings	O
,	O
and	O
customizable	O
pretty	O
printing	O
.	O
</s>
<s>
Additionally	O
,	O
SML/NJ	B-Application
provides	O
some	O
syntactic	O
constructs	O
that	O
are	O
not	O
standard	O
features	O
of	O
SML'97	O
:	O
</s>
<s>
Vector	O
expressions	O
and	O
patterns	O
–	O
SML/NJ	B-Application
allows	O
the	O
creation	O
of	O
vectors	O
with	O
the	O
#[ exp0	O
,	O
exp1	O
,	O
...	O
,	O
expn−1 ]	O
syntax	O
and	O
allows	O
pattern-matching	O
on	O
them	O
with	O
analogous	O
syntax	O
.	O
</s>
<s>
Or-patterns	O
–	O
SML/NJ	B-Application
extends	O
the	O
syntax	O
of	O
SML'97	O
patterns	O
to	O
allow	O
for	O
a	O
matching	O
multiple	O
patterns	O
in	O
a	O
single	O
rule	O
,	O
provided	O
each	O
pattern	O
has	O
the	O
same	O
type	O
,	O
using	O
(	O
apat1	O
|	O
...	O
|	O
apatn	O
)	O
=>	O
exp	O
.	O
</s>
<s>
Object	O
language	O
embedding	O
–	O
SML/NJ	B-Application
provides	O
the	O
quote/antiquote	O
syntax	O
that	O
permits	O
the	O
embedding	O
of	O
expressions	O
in	O
an	O
object	O
language	O
's	O
concrete	O
syntax	O
within	O
ML	O
expressions	O
and	O
programs	O
.	O
</s>
<s>
Higher-order	O
modules	O
–	O
SML/NJ	B-Application
supports	O
the	O
parametrization	O
of	O
functors	O
by	O
allowing	O
functors	O
to	O
be	O
components	O
of	O
structures	O
,	O
in	O
addition	O
to	O
Standard	B-Language
ML	I-Language
's	O
parametric	O
modules	O
in	O
the	O
form	O
of	O
functors	O
.	O
</s>
<s>
The	O
documents	O
describing	O
it	O
have	O
been	O
extracted	O
from	O
the	O
SML/NJ	B-Application
'	O
97	O
files	O
and	O
made	O
available	O
as	O
a	O
GitHub	B-Application
repository	O
of	O
TeX	B-Application
documents	O
which	O
the	O
community	O
is	O
expected	O
to	O
collaborate	O
and	O
grow	O
the	O
language	O
.	O
</s>
<s>
Since	O
at	O
least	O
1998	O
,	O
MLton	O
is	O
the	O
standard	O
bootstrapping	B-Application
compiler	B-Language
,	O
and	O
it	O
has	O
some	O
support	O
for	O
Successor	O
ML	O
.	O
</s>
<s>
In	O
2008	O
,	O
work	O
began	O
on	O
HaMLet	O
,	O
a	O
reference	O
implementation	O
of	O
Successor	O
ML	O
written	O
entirely	O
in	O
Standard	B-Language
ML	I-Language
.	O
</s>
<s>
Since	O
2015	O
,	O
the	O
evolution	O
of	O
SML/NJ	B-Application
geared	O
towards	O
evolving	O
the	O
Basis	O
library	O
and	O
adding	O
support	O
for	O
the	O
Successor	O
ML	O
definition	O
with	O
the	O
release	O
of	O
version	O
110.79	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
2020	O
,	O
64-bit	B-Device
support	I-Device
was	O
added	O
with	O
the	O
release	O
of	O
version	O
110.99	O
.	O
</s>
