STL iterator question

[Thomas]

In my little program I am using a set<vector<int> > rather than a
vector<vector<int> > because the program produces many duplicates, and
the set seems to be just the right type of container to keep them out.

I'm having trouble sending the contents of the set to my screen or to a
file - don't know how to refer correctly to the integers in the vectors:

set<vector<int> > svint;
vector<int> vint;
..
..
svint.insert (vint); etc.
..
..
for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{
for (vector<int>::iterator vi = ?; vi != ?; ++vi)
cout << ? << " ";
cout << endl;
}

I know that in a vector<int> you can refer to the elements by using *vi,
but I don't know how to proceed now that the vectors are embedded in a
std::set. All help appreciated!

T.

 

[RaZiel]

In my little program I am using a set<vector<int> > rather than a
vector<vector<int> > because the program produces many duplicates, and
the set seems to be just the right type of container to keep them out.

I'm having trouble sending the contents of the set to my screen or to a
file - don't know how to refer correctly to the integers in the vectors:

set<vector<int> > svint;
vector<int> vint;
.
.
svint.insert (vint); etc.
.
.
for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{
for (vector<int>::iterator vi = ?; vi != ?; ++vi)
cout << ? << " ";
cout << endl;
}

I know that in a vector<int> you can refer to the elements by using *vi,
but I don't know how to proceed now that the vectors are embedded in a
std::set. All help appreciated!

T.

for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{
for (vector<int>::iterator vi = svi->begin(); vi != svi->end(); ++vi)
cout << *vi << " ";
cout << endl;
}

hth

 

[Victor Bazarov]

In my little program I am using a set<vector<int> > rather than a
vector<vector<int> > because the program produces many duplicates, and
the set seems to be just the right type of container to keep them out.

I'm having trouble sending the contents of the set to my screen or to a
file - don't know how to refer correctly to the integers in the vectors:

set<vector<int> > svint;
vector<int> vint;
.
.
svint.insert (vint); etc.
.
.
for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{

for (vector<int>::iterator vi = ?; vi != ?; ++vi)

..vi = vv.begin(); vi != vv.end(); ++vi)

cout << ? << " ";

cout << *vi << ' ';

cout << endl;
}

I know that in a vector<int> you can refer to the elements by using *vi,
but I don't know how to proceed now that the vectors are embedded in a
std::set. All help appreciated!

V

 

[Thomas]

Thank you very much, RaZiel and Victor Bazarov.

Both of your solutions, which I reproduce below in miniprograms to
eliminate other possible causes, give the same compiler error, which I
do not understand:

[C++ Error] wisseldata.cpp(16): E2034 Cannot convert 'const int *' to
'int *'

----------------------------------------
#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;

int main()
{
set<vector<int> > svint;
int a[] = {1,2,3};
vector<int> vint(a,a+3);
svint.insert(vint);
for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{
for (vector<int>::iterator vi = svi->begin();
vi != svi->end(); ++vi)
cout << *vi << " ";
cout << endl;
}
return 0;
}
-------------------------------------------
#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;

int main()
{
set<vector<int> > svint;
int a[] = {1,2,3};
vector<int> vint (a, a+3);
svint.insert (vint);
for (set<vector<int> >::iterator svi = svint.begin();
svi != svint.end(); ++svi)
{
const vector<int>& vv = *svi;
for (vector<int>::iterator vi = vv.begin();
vi != vv.end(); ++vi)
cout << *vi << ' ';
cout << endl;
}
return 0;
}

T.

 

[Öö Tiib]

Thank you very much, RaZiel and Victor Bazarov.

-------------------------------------------
#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;

int main()
{
     set<vector<int> > svint;
     int a[] = {1,2,3};
     vector<int> vint (a, a+3);
     svint.insert (vint);
     for (set<vector<int> >::iterator svi = svint.begin();
             svi != svint.end(); ++svi)
     {
         const vector<int>& vv = *svi;
         for (vector<int>::iterator vi = vv.begin();

vector const provides only const_iterators:

 

[Thomas]

vector const provides only const_iterators:

for (vector<int>::const_iterator vi = vv.begin();

Thank you so much, Öö Tiib! I hope to study the subject soon.

T.