<s>
In	O
object-oriented	B-Language
programming	I-Language
,	O
a	O
class	B-Application
implementation	I-Application
file	I-Application
is	O
often	O
used	O
to	O
contain	O
the	O
implementation	O
code	O
for	O
the	O
method(s )	O
of	O
a	O
class	O
.	O
</s>
<s>
Programming	O
languages	O
like	O
C	O
and	O
C++	O
make	O
use	O
of	O
these	O
implementation	B-Application
files	I-Application
so	O
as	O
to	O
separate	O
the	O
interface	O
and	O
implementation	O
of	O
these	O
methods	O
.	O
</s>
<s>
If	O
the	O
class	O
definition	O
has	O
been	O
included	O
and	O
the	O
implementation	B-Application
file	I-Application
for	O
its	O
methods	O
is	O
available	O
,	O
the	O
user	O
can	O
instantiate	O
an	O
object	O
of	O
the	O
class	O
.	O
</s>
<s>
An	O
implementation	B-Application
file	I-Application
is	O
used	O
in	O
C++	O
programming	O
when	O
creating	O
a	O
class	O
definition	O
to	O
split	O
the	O
interface	O
from	O
the	O
implementation	O
.	O
</s>
<s>
The	O
header	B-Language
file	I-Language
would	O
declare	O
all	O
the	O
member	B-Application
functions	I-Application
(	O
methods	O
)	O
and	O
data	B-Application
methods	I-Application
(	O
fields	O
)	O
that	O
the	O
class	O
has	O
.	O
</s>
<s>
The	O
implementation	B-Application
file	I-Application
will	O
contain	O
the	O
actual	O
definition	O
or	O
source	O
code	O
of	O
the	O
methods	O
declared	O
in	O
the	O
header	B-Language
file	I-Language
.	O
</s>
<s>
It	O
can	O
also	O
include	O
any	O
libraries	O
from	O
the	O
C++	B-Language
Standard	I-Language
Library	I-Language
that	O
will	O
be	O
used	O
by	O
any	O
of	O
the	O
declared	O
methods	O
in	O
the	O
file	O
.	O
</s>
<s>
The	O
class	B-Application
implementation	I-Application
file	I-Application
will	O
usually	O
have	O
a	O
line	O
to	O
include	O
the	O
associated	O
header	B-Language
file	I-Language
(	O
see	O
examples	O
below	O
)	O
.	O
</s>
<s>
The	O
header	B-Language
file	I-Language
of	O
this	O
C++	O
file	O
would	O
be	O
named	O
"	O
example_class.h	O
"	O
and	O
the	O
implementation	B-Application
file	I-Application
would	O
be	O
"	O
example_class.cc	O
"	O
.	O
</s>
<s>
Another	O
example	O
of	O
how	O
a	O
class	B-Application
implementation	I-Application
file	I-Application
would	O
be	O
structured	O
can	O
be	O
seen	O
with	O
Objective-C	B-Language
,	O
which	O
is	O
used	O
in	O
iOS	B-Application
programming	O
.	O
</s>
<s>
A	O
notable	O
difference	O
between	O
C++	O
and	O
Objective-C	B-Language
when	O
making	O
use	O
of	O
these	O
implementation	B-Application
files	I-Application
is	O
the	O
extensions	O
used	O
at	O
the	O
end	O
of	O
the	O
files	O
.	O
</s>
<s>
and	O
in	O
Objective-C	B-Language
it	O
will	O
be	O
.m	O
,	O
</s>
<s>
This	O
is	O
an	O
example	O
of	O
ExampleClass.h	O
in	O
Objective-C	B-Language
:	O
</s>
<s>
This	O
is	O
an	O
example	O
of	O
the	O
class	O
's	O
implementation	B-Application
file	I-Application
Exampleclass.m	O
in	O
Objective-C	B-Language
:	O
</s>
