Overload operators related to "plus"

PlusOperatorBundle.cpp

// struct test already declared
const test test::operator++(int) {
	test temp = *this;
	this->a++;
	return temp;
}

test& test::operator++() {
	++this->a;
	return *this;
}

test& test::operator+=(const test& temp) {
	this->a += temp.a;
	return *this;
}

test& test::operator+(const test& temp) const {
	test sum;
	sum.a = this->a + temp.a;
	return sum;
}