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Message-ID: <48529C54.5090408@roguewave.com>
Date: Fri, 13 Jun 2008 09:12:04 -0700
From: Martin Sebor <sebor@roguewave.com>
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To: dev@stdcxx.apache.org
Subject: string cow bug ([Fwd: Fwd: Update: string COW])
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 boundary="------------020207050709040808040305"
Sender: Martin Sebor <msebor@gmail.com>
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--------------020207050709040808040305
Content-Type: text/plain; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

...attached is a test case I got from a fellow attendee of
my meeting for what at first blush looks like a COW bug in
stdcxx string. The expected output on line 4 is:

2. cc1: 'H'

Martin

--------------020207050709040808040305
Content-Type: text/x-c++src;
 name="string-cow.cpp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="string-cow.cpp"

#include <string>
#include <iostream>

int main()
{
  std::string s1("hello");
  std::string const& cs1 = s1;
  std::string const  cs2(s1);

  char const& cc1 = cs1[0];
  char const& cc2 = cs2[0];

  std::cout << "1: cs1[0]: '" << cs1[0] << "' / "
	    << static_cast<void const*>(&cs1[0]) << "\n";
  std::cout << "1: cc1:    '" << cc1    << "' / "
	    << static_cast<void const*>(&cc1)    << "\n";
  s1[0] = 'H';

  std::cout << "2: cs1[0]: '" << cs1[0] << "' / "
	    << static_cast<void const*>(&cs1[0]) << "\n";
  std::cout << "2: cc1:    '" << cc1    << "' / "
	    << static_cast<void const*>(&cc1)    << "\n";
  std::cout << "2: cc2:    '" << cc2    << "' / "
	    << static_cast<void const*>(&cc2)    << "\n";
}


--------------020207050709040808040305--