c++ - How to initialize member variable array with template type? -

how can initialize array, s of template type t in constructor stack()? might simple question, don't know of c++. error when compiling (gnu gcc):

error: incompatible types in assignment of 'double*' 'double [0]'

this how i'm initializing stack object in main.cpp:

stack<double> stack; 

and here stack.h file (the implementation included):

#pragma once #include <iostream>  using namespace std;  template <class t>  class stack {     public:         stack();      private:         t s[];         int n; };  template <class t>  stack<t>::stack() {     s = new t[5]; } 

change

//... private:     t s[]; 

to

//... private:     t *s; 

this declaration

private:     t s[]; 

is not c++ compliant. size of array shall constant expression. declared array use pointer in constructor

s = new t[5]; 

or use std::vector instead of manually allocated array.