#include <algorithm>
#include <vector>

#include "Student_info.h"
#include "grade.h"

using std::stable_partition;
using std::vector;

vector<Student_info>
extract_fails(vector<Student_info>& students)
{
#ifdef _MSC_VER
	std::vector<Student_info>::iterator iter =
#else
	vector<Student_info>::iterator iter =
#endif
		stable_partition(students.begin(), students.end(), pgrade);
	vector<Student_info> fail(iter, students.end());
	students.erase(iter, students.end());

	return fail;
}