C++ copy constructor, destructor error and more -

i new c++. have tried figure out how copy constructor works , destructor, cant work wright.

i 2 errors:

error: expected primary-expression before ';' token

delete [];

1. i have tried put different things after delete [] none of them worked, left blank @ moment.

class dynamicline has no member named 'p2',

1. what doing wrong? did decleare p2 in test program.

this header file:

template<class t> class dline {  public:  dline (t *v1, t *v2)      : v1 {v1},     v2 {v2}     {}   t* v1; t* v2;  // copy constructor dline(const dline &l) {     v1 = l.v1;     v2 = l.v2; }   dline& operator= (const dline &l) { if (this == &l) {     return *this; } v1 = l.v1; v2 = l.v2;  return *this; }  ~dline() { delete []; }      }; 

i have vector class:

using namespace std;   vector2::vector2(float nx, float ny)      : x {nx}     , y {ny} { }   float vector2::distancefrom(vector2 v) {     return sqrt( (x - v.x)*(x - v.x) + (y - v.y)*(y - v.y) );  }  ostream& operator << (ostream& os, vector2 v) {     return os << "(" << v.x << "," << v.y << ")"; } 

and part of test program:

vector2 p1 {3.0, 5.0};  vector2 p2 {0,0};  vector2 p3 {7.0, 8.0}; dline<vector2> l1 {&p1, &p2};    dline<vector2> l2 {nullptr, nullptr}; l2 = l1;     l2.p2 = &p3; p1.x = 2.0; 

1. delete used release memory that's dynamically allocated.
2. v1 , v2 members of class dline , p2 variable declared in program.