C++ :: Unable To Pass Reference Of Object Ifstream To Constructor

I'm trying to pass an reference of the object ifstream to my constructor as such:

// myClass.cpp
int main(){
ifstream file;
myClass classobj = myClass(file);}

I am defining the constructor as follows, in myClass.cpp:

myClass::myClass(ifstream &file){
// do stuff
}

I get the error of "No overloaded function of myClass::myClass matches the specified type."

Also, when I build the program, it tells me "syntax error: identifier 'ifstream'"

Also, I made sure I included this:
#include <iostream>
#include <fstream>
#include <sstream>

What am I doing wrong? How can I pass an ifstream reference to my constructor?