• Edward A. Waugh <edward_waugh hotmail.com> Oct 04 2006
• Gregg <no spam.com> Oct 04 2006
• Edward A. Waugh <edward_waugh hotmail.com> Oct 05 2006
• Gregg <no spam.com> Oct 05 2006
• Edward A. Waugh <edward_waugh hotmail.com> Oct 24 2006
• user domain.invalid Oct 27 2006

Edward A. Waugh <edward_waugh hotmail.com> writes:

I used C++ 5 years ago and am currently refreshing myself
on the language and I notice in some of the posts use of
#include <iostream> versus the more traditional #include
<iostream.h>.

Why is this the case?

In my installation I have (relative to the base):

./include/iostream.h
./stlport/src/iostream.cpp
./stlport/stlport/iostream
./stlport/stlport/iostream.h
./stlport/stlport/using/iostream
./stlport/stlport/using/h/iostream.h
./stlport/stlport/wrap_std/iostream
./stlport/stlport/wrap_std/h/iostream.h

so I notice no iostream in ./include and 3 versions of
iostream from in the ./stlport directory tree.

Which one should I be using?

Thanks,
Edward

Gregg <no spam.com> writes:

Edward A. Waugh wrote:
 
 so I notice no iostream in ./include and 3 versions of
 iostream from in the ./stlport directory tree.
 
 Which one should I be using?


<iostream> should be used rather than <iostream.h>

This is true in general for all standard library headers.  Note that 
some of the C-legacy headers have a slightly different naming 
convention: math.h functionality is now accessed via <cmath>.

Pick up a copy of Stroustrup and/or Josuttis for reference.

Edward A. Waugh <edward_waugh hotmail.com> writes:

Thats is fine but #include <iostream> does not work because
the include directory in my installation only has iostream.h
(Why is this case?) Thus my question about which iostream
file to use from the stlport directory tree assuming that
they are versions of iostream that I should be using.

 - Edward

Gregg <no spam.com> writes:

Edward A. Waugh wrote:
 Thats is fine but #include <iostream> does not work because
 the include directory in my installation only has iostream.h
 (Why is this case?) Thus my question about which iostream
 file to use from the stlport directory tree assuming that
 they are versions of iostream that I should be using.
 
  - Edward



dmc -Ic:\dm\stlport\stlport YourFile.cpp

Edward A. Waugh <edward_waugh hotmail.com> writes:

Are we cursed or blessed to have to either use

using namespace std;

everywhere or prefix everything with std::?

I don't mind std::cout and std::endl but std::list or
std::map really annoys me.

 - Edward

user domain.invalid writes:

Edward A. Waugh wrote:
 Are we cursed or blessed to have to either use
 
 using namespace std;
 
 everywhere or prefix everything with std::?
 
 I don't mind std::cout and std::endl but std::list or
 std::map really annoys me.
 
  - Edward


On my experience this is very useful.  It is possible for more than one 
header file to implement e.g. list and it is important to be able to 
control what is being used where.

Best wishes

John Fletcher