模板在制作堆栈时出现不可理解的错误

Question

最近我正在通过模板在 C++ 中创建堆栈数据结构。 一切正常，直到我最终到达这段代码，我无法理解这个程序给我的错误。 谁能告诉我这些错误的含义以及我应该在该程序中进行哪些更改以使其正常运行；

这是错误

/usr/bin/ld: /tmp/cc274HLL.o: warning: relocation against `_ZSt4cout' in read-only section `.text._ZN5stackIiE3popEv[_ZN5stackIiE3popEv]'
/usr/bin/ld: /tmp/cc274HLL.o: in function `main':
stack.cpp:(.text+0xcb): undefined reference to `std::cout'
/usr/bin/ld: stack.cpp:(.text+0xd0): undefined reference to `std::ostream::operator<<(int)'
/usr/bin/ld: /tmp/cc274HLL.o: in function `__static_initialization_and_destruction_0(int, int)':
stack.cpp:(.text+0x100): undefined reference to `std::ios_base::Init::Init()'
/usr/bin/ld: stack.cpp:(.text+0x115): undefined reference to `std::ios_base::Init::~Init()'
/usr/bin/ld: /tmp/cc274HLL.o: in function `stack<int>::push(int)':
stack.cpp:(.text._ZN5stackIiE4pushEi[_ZN5stackIiE4pushEi]+0x28): undefined reference to `std::cout'
/usr/bin/ld: stack.cpp:(.text._ZN5stackIiE4pushEi[_ZN5stackIiE4pushEi]+0x2d): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/usr/bin/ld: /tmp/cc274HLL.o: in function `stack<int>::pop()':
stack.cpp:(.text._ZN5stackIiE3popEv[_ZN5stackIiE3popEv]+0x24): undefined reference to `std::cout'
/usr/bin/ld: stack.cpp:(.text._ZN5stackIiE3popEv[_ZN5stackIiE3popEv]+0x29): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status

这是代码

#include <iostream>

using namespace std;
#define SIZE 50

// defining template class here
template <class type> class stack
{
  type stackBox[SIZE];
  int tos; // top of stack
public:enter code here
  stack() { tos = 0; }
  void push(type elem);
  type pop();
};

// defining the push function of the stack template
template <class type> void stack<type>::push(type i){
  if (tos == SIZE){
    cout << "Segmentation fault  Stack overflow";
    return ;
  }
  stackBox[tos] = i;
  tos++;

}

// defining the pop function of the stack template.
template <class type> type stack<type>::pop(){
  if (tos == 0){
    cout << "Segmentation fault Stack underflow";
    return 0;
  }

  type elem = stackBox[tos];
  tos--;
  return elem;
}


int main(){
  stack<int> ob;
  int arr[] = {10, 20, 30, 40, 50, 60, 70, 80};
  for (auto x: arr)
    ob.push(x);
  cout << ob.pop();
}