vad kan vara fel? <programmering>

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
ifstream text("fil.txt");
string x;
while (text >> x) {
cout << x << endl;
if(x = "mitt")
{
    cout << "found" << x;
}
}
}

feerror: could not convert 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >(((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >*)(& x)))).std::basic_string<_CharT, _Traits, _Alloc>::operator= [with _CharT="char," _Traits="std::char_traits<char>," _Alloc="std::allocator<char>"](((const char*)"mitt"))' to 'bool'|