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ch-08-ex-02-solution.cpp
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Tue, Oct 1, 21:08
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text/x-c++
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Thu, Oct 3, 21:08 (1 d, 20 h)
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R9360 PCSC_git
ch-08-ex-02-solution.cpp
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/*
* chapter-08-exercise-02.cpp
*
* Homebrew abs function
*
* Created on: Nov 1, 2012
* Author: Radu Popescu <radu.popescu@epfl.ch>
*/
#include <iostream>
template
<
typename
T
>
T
absolute
(
const
T
x
)
{
return
(
x
>=
0
)
?
x
:
-
1
*
x
;
}
// Same thing, but computation is done at compile time. Not possible for double
// type
template
<
int
x
>
struct
absolute2
{
const
static
int
val
=
((
x
>=
0
)
?
x
:
-
1
*
x
);
};
int
main
(
int
argc
,
char
*
argv
[])
{
const
int
x1
=
-
2
;
const
int
x2
=
-
3
;
const
double
x3
=
-
7.39
;
std
::
cout
<<
"The absolute value of "
<<
x1
<<
" is "
<<
absolute
(
x1
)
<<
std
::
endl
;
std
::
cout
<<
"The absolute value of "
<<
x2
<<
" is "
<<
absolute2
<
x2
>::
val
<<
" (computed at compile-time)"
<<
std
::
endl
;
std
::
cout
<<
"The absolute value of "
<<
x3
<<
" is "
<<
absolute
(
x3
)
<<
std
::
endl
;
return
0
;
}
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