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List:       kde-devel
Subject:    Re: gcc 3.2 (g++)
From:       Michael Schuerig <schuerig () acm ! org>
Date:       2002-10-30 22:35:52
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On Wednesday 30 October 2002 22:57, Kevin Krammer wrote:
> On Mittwoch, 30. Oktober 2002 22:37, Pieter Breed wrote:
> > hi
> >
> > this is not on-topic, I apologise.  I have a g++ question but I do
> > not know where else to post to.
> >
> > I want to use the "string" class from the c++ STL.  I #include
> > <string> but I get an error like the compiler does not recognise
> > the string type.
> >
> > I have:
> > ---<code>---
> > string rnrgenerator::getNameOfRNG(int i) {   	// line 56
>
> You either specify the correct namespace at the return type (std::)
> or tell the compiler that you want to use the namespace.
>
> so either
> using namespace std;
> somewhre before that code, r
> std::string mrgenerator::getNameOfRNG(int i)

Please don't put
using namespace std;
in a header file that may be used by others.This would more or less 
defeat the purpose of namespaces. In the words of Bjarne Stroustrup "I 
consider nonlocal using-directives primarily a transition tool" 
(CppPL3, p. 183). There's no problem with such a using-directive in an 
implementation (.cpp) file.

Even in a header file you can do something like this

struct C {
    std::string m() {
        using namespace std;
        return string("Hi");
    }
};


Michael

-- 
Michael Schuerig                  If at first you don't succeed...
mailto:schuerig@acm.org           try, try again.
http://www.schuerig.de/michael/   --Jerome Morrow, "Gattaca"

 
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