friend MyList<T> operator + (const MyList<T> &l1, const T &item){
MyList<T> tmp;
tmp.n = l1.n + 1;
int t = tmp.get_SIZE();
while( t < tmp.n)
tmp.double_space();
tmp[l1.n] = item;
return tmp;
}
friend MyList operator + (const MyList &l1, const MyList &l2){
MyList<T> tmp; int i;
tmp.n = l1.n + l2.n;
int t = tmp.get_SIZE();
while(t < tmp.n)
tmp.double_space();
for (i = 0; i < l1.n; ++i)
tmp[i] = l1[i];
for (i = 0; i < l2.n; ++i)
tmp[i+l1.n] = l2[i];
return tmp;
}