c++/7974: cannot reference an element of a vector in a class object from an iterator for a vector of such objects (the -> operator fails)

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* c++/7974: cannot reference an element of a vector in a class object from an iterator for a vector of such objects (the -> operator fails)
@ 2002-09-18 16:06 nixonj
  0 siblings, 0 replies; only message in thread
From: nixonj @ 2002-09-18 16:06 UTC (permalink / raw)
  To: gcc-gnats


>Number:         7974
>Category:       c++
>Synopsis:       cannot reference an element of a vector in a class object from an iterator for a vector of such objects (the -> operator fails)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 18 16:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     nixonj@agr.gc.ca
>Release:        unknown-1.0
>Organization:
>Environment:
john@otis programs]$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)

>Description:
The code,compilation command, and the debugger
output follows. As stated in the synopsis, it appears
that the -> operator fails to generate the correct
code in this case because the vector "data" appears
to be empty when referenced through the iterator for the
vector of "test" objects.
The preprocessor output is in the attached file test1.ii

After this I attempted a simple workaround to this problem 
that also failed. I replaced only the problem line with
the line reproduced by the debugger. The debugger output is
 at the end of this file.

using namespace std;

#include <vector>

/* compile with
g++ -o test1 -Wall -g /home/john/programs/test1.cpp
*/
  
    class test{
  public:
      vector<int> data;
      
      void init(const int i){data.reserve(2);data[0]=i;data[1]=1-i;}
      
      void print(){cout<<"data = "<<data[0]<<' '<<data[1]<<endl;}
     };
       
  int main(){
    vector<test> lst1;
    vector<test>::iterator it1;
    
    for(int i=0;i<2;i++){
      test obj;
      obj.init(i);
      obj.print();
      lst1.push_back(obj);}
    for(it1=lst1.begin();it1!=lst1.end();it1++)
      cout<<(it1->data)[0];//error here data is claimed not to exist
    return 0;}


[john@otis programs]$ g++ -o test1 -Wall -g /home/john/programs/test1.cpp
[john@otis programs]$ gdb test1
GNU gdb Red Hat Linux 7.x (5.0rh-15) (MI_OUT)
Copyright 2001 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
(gdb) run
Starting program: /raid/home/john/programs/test1 
data = 0 1
data = 1 0

Program received signal SIGSEGV, Segmentation fault.
0x0804901a in main () at /home/john/programs/test1.cpp:28
28            cout<<(it1->data)[0];//error here data is claimed not to exist
(gdb) print *it1
$1 = {data = {<_Vector_base<int,allocator<int> >> = {<_Vector_alloc_base<int,allocator<int>,true>> = {_M_start = 0x0, 
        _M_finish = 0x0, _M_end_of_storage = 0x0}, <No data fields>}, <No data fields>}}
(gdb) 

Attempted workaround to this problem:

Program received signal SIGSEGV, Segmentation fault.
0x0804902e in main () at /home/john/programs/test1.cpp:27
27          for(int i=0;i<2;i++)for(int j=0;j<2;j++)
              {cout<<lst1[i].data[j]<<' ';cout<<endl;}

(gdb) print lst1[0]
$2 = (test &) @0x804c910: {data = {<_Vector_base<int,allocator<int> >> = {<_Vector_alloc_base<int,allocator<int>,true>> = {
        _M_start = 0x0, _M_finish = 0x0, _M_end_of_storage = 0x0}, <No data fields>}, <No data fields>}}

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test1.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test1.ii"

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IDA7fQo=


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2002-09-18 16:06 c++/7974: cannot reference an element of a vector in a class object from an iterator for a vector of such objects (the -> operator fails) nixonj

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