[Bug c++/56498] New: invalid declaration of string iterator on comma separated list

[hgkamath at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56498

             Bug #: 56498
           Summary: invalid declaration of string iterator on comma
                    separated list
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hgkamath@hotmail.com


Trying to declare and initialize two iterators in a comma separated list
results in an invalid declaration error.

workaround, declare the iterator before the for statement.

a.cpp: In function ‘bool ispalindrome(std::string&)’:
a.cpp:7:37: error: invalid declaration of
‘std::basic_string<char>::reverse_iterator’
a.cpp:7:62: error: expected ‘;’ before ‘i2’
a.cpp:7:62: error: ‘i2’ was not declared in this scope
a.cpp:7:89: error: expected ‘)’ before ‘;’ token
a.cpp:7:92: error: ‘i1’ was not declared in this scope
a.cpp:7:98: error: ‘i2’ was not declared in this scope
a.cpp:7:102: error: expected ‘;’ before ‘)’ token




#include <iostream>
#include <string>

using namespace std;

bool ispalindrome(string &s){
  // replace with below line to see the error.
  // for(string::iterator i1=s.begin(),string::reverse_iterator i2=s.rbegin() ;
i1!=s.end();  i1++, i2++) {
  string::reverse_iterator i2=s.rbegin();
  for(string::iterator i1=s.begin() ; i1!=s.end();  i1++, i2++) {
    if (*i1!=*i2) return false;
  }
  return true;
}

int main()
{
  string s;
    cin >> s ; 
  if (ispalindrome(s)) {
    cout << "First\n";
  }else{
    cout << "Second\n";
  }
    return 0;
}