#include "student_info.h"

bool compare_students(const StudentInfo& a, const StudentInfo& b)
{
	return a.name < b.name;
}

std::istream& read_homework(std::istream& in, std::vector<double>& hw)
{
	if (in) {
		hw.clear();	// Empty the vector.

		double x;
		/*
		 * Loop invariant:
		 *	- 'homework' contains all the homework grades read so far
		 */
		while (in >> x)
			hw.push_back(x);

		in.clear();	// Clear the stream in case
				// it will be used again.
	}
	return in;
}

std::istream& read_student(std::istream& is, StudentInfo& s)
{
	/* Read and store student's name, midterm and final */
	is >> s.name >> s.midterm >> s.final;

	read_homework(is, s.homework);
	return is;
}