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From: =?ISO-8859-1?Q?Falk_Tannh=E4user?= <falk.tannhauser@crf.canon.fr>
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Thu, 10 Mar 2005 12:57:14 +0100
Organization: Canon Research Centre France
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Date: 2005-03-10T12:57:14+01:00
List-Id: <comp.lang.ada>

Georg Bauhaus wrote:

> Ioannis Vranos wrote:
> 
>> For example consider this simple bullet-proof code for string input 
>> and processing:
>>
>>
>> #include <iostream>
>> #include <string>
>>
>> int main()
>> {
>>     using namespace std;
>>
>>     string s;
>>
>>     while(cin)
>>     {
>>         getline(cin,s);
>>
>>         /*Do things with s */;
>>     }
>> }
> 
> 
> When I run your program and have it read the null
> device, it stops after reading 536870883 bytes if s.length()
> is right. This number is 29 bytes less than 2^29; however,
> s.max_size() is printed as 1073741820, which is 4 bytes less
> than 2^30.

The program should read

  #include <iostream>
  #include <istream>
  #include <string>

  int main()
  {
    std::string s;
    while(std::getline(std::cin, s))
    {
      // Do things with s
    }
    return 0;
  }

so that the loop body is not executed after failing of getline().
However, even the original version, while reading from /dev/null,
should execute the loop only once and leave the string 's' empty
since End Of File should be detected on the first attempt to
read a character. Could it be there is something seriously wrong
with your compiler / standard library installation?

Falk