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From: zdv176@zam229.zam.kfa-juelich.de (B.Mohr)
Subject: Re: Problem with std::make_pair?
Date: 1999/08/02
Message-ID: <zdv176.933594420@zam229>#1/1
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Approved: stephen.clamage@sun.com (comp.std.c++)
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Organization: Forschungszentrum Juelich
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Originator: clamage@taumet


Valentin Bonnard <Bonnard.V@wanadoo.fr> writes:
> But the problem here is _not_ the assignement to p, 
> as you seem to believe. It's just the 
> std::make_pair("B", 2) call in itself which doesn't 
> compile.
> The real problem is with the fact that gcc tries to 
> assign _arrays_, and thus generates the error:
> incompatible types in assignment of `const char[2]' to `char[2]'

I understand this. But why did it work with g++/egcs before 2.95
and KCC before 3.4? I am sure KCC never allowed array assigment.

> So your code is ill-formed, egcs is correct here.
> (And it took me about half an hour to figure out.)

I believe you but there are dozens of books out there (e.g. Matt Austerns
great book on "Generic Programming and the STL"(?)) with the following
example (out of my head):

  #include <iostream>
  #include <map>
  #include <string>

  int main() {
    std::multimap<std::string,long> phonebook;
    phonebook.insert(std::make_pair("Joe", 134567));         /*1*/
    //...
  }

They all worked fine but if your analysis is correct they are wrong
because line /*1*/ no longer compiles. I used this example in my STL
course; I am not sure whether I can explain my beginner programmers
why this example doesn't work.

Thanks
Bernd
-- 
Bernd Mohr / Research Centre Juelich, ZAM, Germany / B.Mohr@fz-juelich.de


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