59
59
tetra (size_type a, size_type b, size_type c, size_type d)
60
60
{ _p[0]=a; _p[1]=b; _p[2]=c; _p[3]=d; }
62
62
friend std::ostream& operator << (std::ostream& os, const tetra& x) {
63
63
return os << "T\t" << x._p[0] << " " << x._p[1] << " " << x._p[2] << " " << x._p[3]; }
64
64
size_type operator [] (size_type i) const { return _p[i]; }