Why am I getting this ifstream error?

Implicit instantiation of undefined template 'std::basic_ifstream<char,std::char_traits<char>>'

---

#ifndef MAPPER_H
#define MAPPER_H
#include <iostream>
#include <string>
#include <vector>
#include "KeyValue.h"
#include "Parser.h"

using namespace std;
class Mapper
{
public:
	Mapper(ifstream& infile);
	~Mapper(void);
	void loadTokens();
	void showTokens();
	void map();
	void printMap();
	void printMap(string map_fileName);
private:
    ifstream inFile;  //<-- is where the error is happening
	vector<string> tokens;
	vector<KeyValue> map_output;
	Parser* parser;
};

#endif

I've even tried putting std::ifstream and it still doesn't work.

When I #include <fstream> instead of #include <iostream>, I get these errors in fstream.tcc and basic_ios.tcc:

'operator=' is a private member of 'std::basic_streambuf<char>'

And since that's part of the fstream library, obviously something i'm doing is wrong...

Anyone able to help?

You're missing

#include <fstream>

and you probably assign somthing to inFile which is not allowed.