Re: Proper and portable ways using manipulator

[Wei Qin <wqin at EE dot Princeton dot EDU>]

Hi, LLeweLLyn,

	Thanks for the reply.
	I tried <iomanip>, it works for g++3, but again not for g++2.
I grepped its g++-2 directory and the only showbase that I found is an enum.
So I now assume that there is no showbase manipulator in that library.

Is there any similar backward compatible way to use manipulators as
the hash_map one given at
http://gcc.gnu.org/onlinedocs/libstdc++/faq/#5_4
?

Wei

On 7 Aug 2003, LLeweLLyn Reese wrote:

> Wei Qin <wqin@EE.Princeton.EDU> writes:
>
> > Hi,
> > 	I used some manipulators in the form of
> >
> > #include <iostream>
> > #include <ios>
>
> Try:
> #include <iomanip>
>
> instead. (Note: I don't have 2.96 availible to test.)
>
> >
> > int main () {
> >
> > 	std::cout << std::showbase << std::hex << 100 << std::endl;
> > }
> >
> > 	This compiles fine with g++ 3.x. However, it fails on g++ 2.96
> > since it cannot find ios. When I remove ios, it cannot find showbase. Then
> > I change std::showbase to std::ios::showbase, but this showbase is not a
> > manipulator any more. As a result the program outputs 8064 instead of
> > 0x64.
> > 	So my question is: Is there any good coding practice to make sure
> > that the same code compiles for both and works as intended? Thanks.
>
> Compile every change with both compilers.
>