Pass a Stack by Reference

[joatmon]

I have a std::stack that I'd like to pass to a function

#include <string>
#include <stack>
using namespace std;
bool mess_with_stack(const stack<string>* s);

int main{}
{
  bool test;
  stack<string> s;
  s.push("something");
  test = mess_with_stack(&s);
}

bool mess_with_stack(const stack<string>* s)
{
   if (s.empty())
      return true;
}

The compiler doesn't like the s.empty() call. Anybody see what I am doing wrong?

Thanks.

[andywestken]

What you need is an & not a *

bool mess_with_stack(const stack<string>& s)

You did say pass by reference (const stack<string>&) rather than pointer (const stack<string>*)

[Branflakes91093]

You need to dereference the pointer to get what it points to. You can do so manually using the '*' operator, or by using the '->' operator.

if((*s).empty())
    return true;

or

if(s->empty())
    return true;

Or use a reference instead of a pointer.

[joatmon]

That was it. Thanks!