Mingw, Cygwin g++, STL set - stl

Question

I tried to remove element from STL set data structure by iterating each element. The problem is that I can't delete each element by iterating set structure. When I tried that way, it just give error message or program is stuck. When it was happened, I thought it was Mingw's bug, so I tried Cygwin g++; however Cygwin g++ also didn't work.
How should I change the code to delete each element in set structure by using iteration
MinGw and Cygwin are installed on windows 7 x64 system.
//Tested by using MinGW, Cygwin g++ in Win64 environment
#include <iostream>
#include <string>
#include <set>
using namespace std;
int main()
{
set<int> mySet;
mySet.insert(1);
mySet.insert(2);
mySet.insert(7);
/*
//Works fine
mySet.erase(1);
mySet.erase(2);
mySet.erase(7);
*/
/*
//Error
for(set<int>::iterator iter = mySet.begin(); iter != mySet.end(); iter++)
mySet.erase(iter);
//Error
int size = mySet.size();
set<int>::iterator iter = mySet.begin();
for(int i = 0; i < size(); i++)
{
mySet.erase(iter);
iter++
}
*/
//print out elements in mySet
for(set<int>::iterator iter = mySet.begin(); iter != mySet.end(); iter++)
cout << *iter << " ";
return 0;
}

Answer 1

Like Igor Tandetnik sayed mySet.clear() will work.
But normally in C++11, mySet.erase(iter) should return the following element:
Return an iterator to the element that follows the last element removed (or set::end, if the last element was removed).
In C++98 it returns nos value, that is why it doesn't work.
Try to pass -std=c++11when you'll compile to test.
Source : http://www.cplusplus.com/reference/set/set/erase/