C++ - ofstream overloaded operator '<<' is ambiguous? - c++

Question

I am having trouble solving this error.
Use of overloaded operator '<<' is ambiguous (with operand types 'std::ofstream' (aka 'basic_ofstream') and 'std::string' (aka 'basic_string<char, char_traits, allocator>'))
My first assumption was because of the similar ostream operator, but no luck.
Any help is much appreciated.
maintest.cpp
#include <iostream>
#include <fstream>
#include <string>
#include "player.h"
int main() {
//#########################################################################
// TEST - Overloading Stream Operators
//**************************************************************
// Test ostream & istream
/*std::cout << "\n---ISTREAM/OSTREAM TEST---\n";
Player playerS1;
std::cin >> playerS1;
std::cout << "Test output: ";
std::cout << playerS1;*/
//**************************************************************
// Test ofstream
std::cout << "\n---OFSTREAM TEST---\n";
Player playerS2;
int playerScoreS2(66);
std::string playerNameS2("Tanner");
playerS2.SetName(playerNameS2);
playerS2.SetScore(playerScoreS2);
std::ofstream outFile;
outFile.open("testFile");
if(!outFile.is_open()) {
std::cout << "Could not open file." << std::endl;
}
else {
std::cout << "File opened." << std::endl;
}
outFile << playerS2;
std::cout << "File closed." << std::endl;
outFile.close();
// Return here!!!
return 0;
}
player.h
#ifndef PLAYER_H // MACRO guard
#define PLAYER_H
#include <iostream>
#include <fstream>
#include <string>
class Player {
public:
Player(); // Default constructor
Player(const int &score);
Player(const std::string &name);
Player(const std::string &name, const int &score);
// Output functions
std::string toString() const;
std::string toFileString() const;
friend std::ostream& operator<<(std::ostream& out, const Player& line);
friend std::ofstream& operator<<(std::ofstream& outFS, const Player& line);
friend std::istream& operator>>(std::istream& in, Player& line);
friend std::ifstream& operator>>(std::ifstream& inFS, Player& line);
private:
std::string name;
int score;
};
player.cpp
/*********************
OTHER MEMBER FUNCTIONS
*********************/
std::string Player::toString() const {
// What is the format????
// Using comma delimited for now.
return name + ',' + std::to_string(score);
}
std::string Player::toFileString() const {
return name + ',' + std::to_string(score);
}
/****************************
INPUT/OUTPUT STREAM OPERATORS
****************************/
/*std::ostream& operator<<(std::ostream& out, const Player& line) {
out << line.toString() << std::endl;
return out;
}
std::istream& operator>>(std::istream& in, Player& line) {
std::cout << "\nEnter Name: ";
in >> line.name;
std::cout << "Enter Score: ";
in >> line.score;
return in;
}*/
/*std::ifstream& operator>>(std::ifstream& inFS, Player& line) {
inFS >> line.name >> line.score;
return inFS;
}*/
std::ofstream& operator<<(std::ofstream& outFS, const Player& line) {
outFS << line.toFileString() << std::endl;
return outFS;
}
My assumption, based on the assignment, was that the ostream and ofstream operators were essentially the same but using two different functions outputing in different formats. (They currently output the same format).
Any advice?