In article <pjl.771134605@graceland.att.com> pjl@graceland.att.com (Paul J. Lucas) writes:
>>>Just wondering, what are "New Style" headers?
>
>> #include <iostream>
>
>>(no ".h")
>
> Why?

 See Pete Beckers explanation: its to do with namespaces.

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In article <2t14gb$l5t@nwfocus.wa.com> rrowe@chinook.halcyon.com (Robin Rowe) writes:
>Just wondering, what are "New Style" headers?

 #include <iostream>

(no ".h")

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        JOHN (MAX) SKALLER,         INTERNET:maxtal@suphys.physics.su.oz.au
 Maxtal Pty Ltd,      CSERVE:10236.1703
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In <Cr3z3o.xD@ucc.su.OZ.AU> maxtal@physics.su.OZ.AU (John Max Skaller) writes:

>In article <2t14gb$l5t@nwfocus.wa.com> rrowe@chinook.halcyon.com (Robin Rowe) writes:
>>Just wondering, what are "New Style" headers?

> #include <iostream>

>(no ".h")

 Why?
--
 - Paul J. Lucas
   AT&T Bell Laboratories
   Naperville, IL

In article <pjl.771134605@graceland.att.com>, pjl@graceland.att.com (Paul J. Lucas) writes:
> In <Cr3z3o.xD@ucc.su.OZ.AU> maxtal@physics.su.OZ.AU (John Max Skaller) writes:
>> In article <2t14gb$l5t@nwfocus.wa.com> rrowe@chinook.halcyon.com (Robin Rowe) writes:
>>> Just wondering, what are "New Style" headers?

>> #include <iostream>

>> (no ".h")

>  Why?

To make them different from those with ".h" of course.

It has to do with the introduction of namespaces for the standard
libraries.  The ".h"-less headers will leave all names in a standard
namespace (call it "std").  The ".h" header would become:
 // Long copyright notice.
 #include <iostream>
 using namespace std;
so that older code will continue to work.  There is a discussion of
this the chapter on namespaces in D&E.

-- Olaf Weber

Olaf Weber (olaf@cwi.nl) wrote:

: It has to do with the introduction of namespaces for the standard
: libraries.  The ".h"-less headers will leave all names in a standard
: namespace (call it "std").  The ".h" header would become:
:  // Long copyright notice.
:  #include <iostream>
:  using namespace std;
: so that older code will continue to work.  There is a discussion of
: this the chapter on namespaces in D&E.

What is "D&E" ?

Dave

In article <pjl.771134605@graceland.att.com>,
Paul J. Lucas <pjl@graceland.att.com> wrote:
>In <Cr3z3o.xD@ucc.su.OZ.AU> maxtal@physics.su.OZ.AU (John Max Skaller) writes:
>
>>In article <2t14gb$l5t@nwfocus.wa.com> rrowe@chinook.halcyon.com (Robin Rowe) writes:
>>>Just wondering, what are "New Style" headers?
>
>> #include <iostream>
>
>>(no ".h")
>
> Why?

 To distinguish them from "Old Style" headers, of course.
 -- Pete

In article <pjl.771134605@graceland.att.com>,
Paul J. Lucas <pjl@graceland.att.com> wrote:
>In <Cr3z3o.xD@ucc.su.OZ.AU> maxtal@physics.su.OZ.AU (John Max Skaller) writes:
>
>>In article <2t14gb$l5t@nwfocus.wa.com> rrowe@chinook.halcyon.com (Robin Rowe) writes:
>>>Just wondering, what are "New Style" headers?
>
>> #include <iostream>
>
>>(no ".h")
>
> Why?

 OK, a serious answer...
 The ANSI/ISO working paper says that the various library functions and
classes are contained in their own namespace, named 'std'. The new style
headers simply contain the class definitions, function prototypes, etc.,
enclosed in this namespace. In order to use any of these names you must either
qualify the name with 'std::' or you must add a 'using' directive.
 In order to preserve existing code, the old style headers will contain
appropriate using directives which will put all of these identifiers into the
global namespace, just like they used to be. The simplest approach, adding
'using std', doesn't work. It affects name lookup, but doesn't actually put the
names in the namespace into the global namespace. The result would be that any
name explicitly qualified with '::' wouldn't be found. So the old style headers
will have to be written with an explicit 'using' directive for each name that
belongs in global scope.
 -- Pete

Just wondering, what are "New Style" headers?

Robin

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