From mboxrd@z Thu Jan  1 00:00:00 1970
From: "John F. Kolen" <jkolen@typhoon.coginst.uwf.edu>
To: gnu-win32@cygnus.com
Subject: Re:
Date: Tue, 24 Nov 1998 12:54:00 -0000
Message-id: <9811241059.ZM4189@typhoon.coginst.uwf.edu>
References: <199811232132.WAA00238@dedalus.com> <matra@dedalus.com>
X-SW-Source: 1998-11/msg00914.html

/* I tried replying directly, but the mail bounced */

>   vector<vector<int> > mymatrix(n);
>   for (int i = 0;i < n;i++)
>      for (int j = 0;j < n;j++)
>         mymatrix[i][j] = 0;

What you have there should not work.  Take a look at the default constructor
and operator[] for vector<int>.

vector() : start(0), finish(0), end_of_storage(0) {}
reference operator[](size_type n) { return *(begin() + n); }
iterator begin() { return start; }

Your instantiation of of mymatrix will create n 0-element vectors with start
ptrs set to null.  This is why the deref is failing.  Here's a fix.

   for (int i = 0;i < n;i++){
      mymatrix[i].resize(n);
      for (int j = 0;j < n;j++)
         mymatrix[i][j] = 0;
   }


-- 
John F. Kolen				voice: (850)474-3075 
Assistant Professor			fax:   (850)474-3023
Dept. of Computer Science
University of West Florida
Pensacola, FL 32514
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