<s>
The	O
GNU	B-Application
Scientific	I-Application
Library	I-Application
(	O
or	O
GSL	O
)	O
is	O
a	O
software	B-Library
library	I-Library
for	O
numerical	O
computations	O
in	O
applied	O
mathematics	O
and	O
science	O
.	O
</s>
<s>
The	O
GSL	O
is	O
written	O
in	O
C	B-Language
;	O
wrappers	O
are	O
available	O
for	O
other	O
programming	O
languages	O
.	O
</s>
<s>
The	O
GSL	O
is	O
part	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
and	O
is	O
distributed	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
They	O
aimed	O
at	O
writing	O
a	O
modern	O
replacement	O
for	O
widely	O
used	O
but	O
somewhat	O
outdated	O
Fortran	B-Application
libraries	O
such	O
as	O
Netlib	B-Application
.	O
</s>
<s>
The	O
software	B-Library
library	I-Library
provides	O
facilities	O
for	O
:	O
</s>
<s>
Since	O
the	O
GSL	O
is	O
written	O
in	O
C	B-Language
,	O
it	O
is	O
straightforward	O
to	O
provide	O
wrappers	O
for	O
other	O
programming	O
languages	O
.	O
</s>
<s>
The	O
GSL	O
can	O
be	O
used	O
in	O
C++	B-Language
classes	O
,	O
but	O
not	O
using	O
pointers	O
to	O
member	O
functions	O
,	O
because	O
the	O
type	O
of	O
pointer	O
to	O
member	O
function	O
is	O
different	O
from	O
pointer	O
to	O
function	O
.	O
</s>
<s>
Another	O
common	O
workaround	O
is	O
using	O
a	O
functor	B-Language
.	O
</s>
<s>
C++	B-Language
wrappers	O
for	O
GSL	O
are	O
available	O
.	O
</s>
<s>
They	O
do	O
offer	O
access	O
to	O
matrix	O
and	O
vector	O
classes	O
without	O
having	O
to	O
use	O
GSL	O
's	O
interface	O
to	O
malloc	B-Language
and	O
free	B-Language
functions	O
.	O
</s>
<s>
Some	O
also	O
offer	O
support	O
for	O
also	O
creating	O
workspaces	O
that	O
behave	O
like	O
Smart	B-Language
pointer	I-Language
classes	O
.	O
</s>
<s>
Finally	O
,	O
there	O
is	O
(	O
limited	O
,	O
as	O
of	O
April	O
2020	O
)	O
support	O
for	O
allowing	O
the	O
user	O
to	O
create	O
classes	O
to	O
represent	O
a	O
parameterised	O
function	O
as	O
a	O
functor	B-Language
.	O
</s>
<s>
While	O
not	O
strictly	O
wrappers	O
,	O
there	O
are	O
some	O
C++	B-Language
classes	O
that	O
allow	O
C++	B-Language
users	O
to	O
use	O
the	O
Gnu	B-Application
Scientific	I-Application
Library	I-Application
with	O
wrapper	O
features	O
.	O
</s>
