<s>
Partial	B-Language
template	I-Language
specialization	I-Language
is	O
a	O
particular	O
form	O
of	O
class	O
template	O
specialization	O
.	O
</s>
<s>
Usually	O
used	O
in	O
reference	O
to	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
,	O
it	O
allows	O
the	O
programmer	O
to	O
specialize	O
only	O
some	O
arguments	O
of	O
a	O
class	O
template	O
,	O
as	O
opposed	O
to	O
explicit	O
full	O
specialization	O
,	O
where	O
all	O
the	O
template	O
arguments	O
are	O
provided	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
C++	B-Language
standard	O
containers	O
are	O
class	O
templates	O
.	O
</s>
<s>
The	O
next	O
example	O
class	O
KeyStringPair	O
is	O
derived	O
from	O
the	O
original	O
KeyValuePair	O
with	O
a	O
new	O
name	O
,	O
and	O
defines	O
a	O
partial	B-Language
template	I-Language
specialization	I-Language
.	O
</s>
<s>
C++	B-Language
templates	O
are	O
not	O
limited	O
to	O
classes	O
-	O
they	O
can	O
also	O
be	O
used	O
to	O
define	O
function	O
templates	O
.	O
</s>
<s>
But	O
,	O
function	O
templates	O
can	O
be	O
overloaded	B-Language
,	O
which	O
gives	O
nearly	O
the	O
same	O
effect	O
as	O
what	O
partial	O
function	O
template	O
specialization	O
would	O
have	O
.	O
</s>
<s>
In	O
the	O
example	O
listed	O
above	O
,	O
note	O
that	O
while	O
the	O
last	O
two	O
definitions	O
of	O
the	O
function	O
Foo	O
are	O
legal	O
C++	B-Language
,	O
they	O
are	O
considered	O
ill-formed	O
according	O
to	O
the	O
standard	O
because	O
they	O
are	O
non-overloadable	O
declarations	O
.	O
</s>
<s>
This	O
is	O
because	O
the	O
definition	O
of	O
function	B-Language
overloading	I-Language
only	O
accounts	O
for	O
the	O
function	O
name	O
,	O
parameter	O
type	O
list	O
and	O
the	O
enclosing	O
namespace	O
(	O
if	O
any	O
)	O
.	O
</s>
