segmentation fault when calling close on ifstream object - c++

Question

I am trying to read a text file into a two dimensional character array. When I call close on the ifstream object after extracting the data, I get a segmentation fault.
This works:
problem::problem(obj *o1, obj* o2, char *state_file)
{
ifstream infile;
string line;
infile.open(state_file, ios::in);
getline(infile,line);
infile.close();
}
This doesnt:
problem::problem(obj *o1, obj* o2, char *state_file)
{
ifstream infile;
string line;
//data is char data[6][7] and is declared in the header
//line is EXACTLY 7 characters lone
infile.open(state_file, ios::in);
for(int i = 5;i >= 0;i--)
{
getline(infile,line);
for(int j = 0;j < 7;j++)
data[i][j] = line[j];
}
cerr << "PROGRAM OK" << endl;
infile.close();
cerr << "The program doesn't get here" << endl;
//Some more constructor code
}
Why am I getting a segmentation fault when I call infile.close()?
SSCCE version that works with the same input file:
#include <string>
#include <fstream>
using namespace std;
class func
{
public:
func(char *);
private:
char data[6][7];
};
func::func(char *state_file)
{
ifstream infile;
string line;
infile.open(state_file, ios::in);
for(int i = 5;i >= 0;i--)
{
getline(infile,line);
for(int j = 0;j < 7;j++)
data[i][j] = line[j];
}
infile.close();
}
int main(int argc, char *argv[])
{
func *obj = new func(argv[1]);
delete obj;
return 0;
}
From main:
obj *p1 = new obj(&something);
obj *p2 = new obj(&something);
problem *p;
if(argc == 3)
p = new problem(p1, p2, argv[2]); //SEGFAULTS HERE
else
p = new problem(p1, p2);
from the header with the class declaration:
public:
problem(obj *, obj *);
problem(obj *, obj *, char *);
private:
char data[6][7];

Answer 1

Are you sure that your file always contains at least six lines?
The usual way to "iterate" on a ifstream is:
ifstream is("test.txt");
string line;
while(getline(is, line))
{
cout<<line<<endl;
}

Answer 2

I figured it out. The problem had something to do with how the object file was being linked during the build process. Removing all the .o files and rebuilding from scratch solved the problem. Thank you everyone for your input. I apologize for not doing a clean build from the beginning and wasting your time.