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On Wed, 31 Mar 2004 10:39:52 -0700, Jonathan Turkanis wrote:

>
> "osmium" <> wrote in message
> news:c4ev62$2hoojv$...
>> Jonathan Turkanis writes:
>>
>> > > Well... it's called <cmath> now (and the symbols are in the std
>> > > namespace)... and the "performance" is a QoI (Quality of
>> > Implementation)
>> > > issue. You'd have to take that up with your compiler vendor.
>> >
>> > <math.h> is still part of the standard, although officially
>> > deprecated.
>>
>> I think he means the spelling of <math.h> is deprecated, *not* the
> contents
>> that go with it. I see no reason to cast doubt on the quality of a
> typical
>> implementation. Math is math.
>
> The contents of <math.h> and <cmath> are not the same: <math.h> is
> specified to define functions in the global namespace, <cmath> in the
> namespace std.
>
> I wasn't commenting on implementation at all.
>
> Jonathan


Do they differ in any way other than the namespace they are in ?

"AciD_X" <> wrote in message
newsan.2004.04.01.00.40.12.58754@rocketNOSPAMmai l.com...
> On Wed, 31 Mar 2004 10:39:52 -0700, Jonathan Turkanis wrote:
>
> >
> > "osmium" <> wrote in message
> > news:c4ev62$2hoojv$...
> >> Jonathan Turkanis writes:

> >
> > The contents of <math.h> and <cmath> are not the same: <math.h> is
> > specified to define functions in the global namespace, <cmath> in
the
> > namespace std.

<snip>

> Do they differ in any way other than the namespace they are in ?

That's the only difference.

Jonathan

"Jonathan Turkanis" <> wrote in message news:<c4g2le$2hivok$>...
> "AciD_X" <> wrote in message
> newsan.2004.04.01.00.40.12.58754@rocketNOSPAMmai l.com...
> > On Wed, 31 Mar 2004 10:39:52 -0700, Jonathan Turkanis wrote:
> >
> > >
> > > "osmium" <> wrote in message
> > > news:c4ev62$2hoojv$...
> > >> Jonathan Turkanis writes:
>
> > >
> > > The contents of <math.h> and <cmath> are not the same: <math.h> is
> > > specified to define functions in the global namespace, <cmath> in
> the
> > > namespace std.
>
> <snip>
>
> > Do they differ in any way other than the namespace they are in ?
>
> That's the only difference.

If my memory is right <cmath> includes also overloads for every
<math.h> function, using float instead of double.
<math.h> <cmath>
double sin(double x) double std::sin(double x);
float std::sin(float x);
....

Regards.
Bobo.

Bobo wrote in news: om:

>> That's the only difference.
>
> If my memory is right <cmath> includes also overloads for every
> <math.h> function, using float instead of double.
> <math.h> <cmath>
> double sin(double x) double std::sin(double x);
> float std::sin(float x);
>

Nope in C++ <math.h> is something like this:

#include <cmath>

using std::sin;
/* repeat the above line for every name that
<cmath> declares in namespace std
*/

Rob.
--
http://www.victim-prime.dsl.pipex.com/

"Bobo" <> wrote in message
news: om...
> "Jonathan Turkanis" <> wrote in message
news:<c4g2le$2hivok$-

> > > >
> > > > The contents of <math.h> and <cmath> are not the same:
<math.h> is
> > > > specified to define functions in the global namespace, <cmath>
in
> > the
> > > > namespace std.
> >
> > <snip>
> >
> > > Do they differ in any way other than the namespace they are in ?
> >
> > That's the only difference.
>
> If my memory is right <cmath> includes also overloads for every
> <math.h> function, using float instead of double.
> <math.h> <cmath>
> double sin(double x) double std::sin(double x);
> float std::sin(float x);
> ...
>

You're right that the C standard library header <math.h> is not the
same as the C++ standard hread <math.h>, but I was sepcifically
talking about the C++ standard library.

In addition, the C99 header <math.h> includes stuff that the C++
header doesn't.

Jonathan