I am trying to sort a vector by passing the first and last item and passing a bool predicate. Cannot for the life of me figure out what i am doing wrong. Suspect its lack of understanding of classes. But its really got me stumped.
Am going through accelerated c++ and am on chapter 4. Spent a good while reading around but am not getting anywhere. Probably doesn't help me that i am doing things in classes either so i can keep chapters side by side.
The error i am getting is
error C2064: term does not evaluate to a function taking 2 arguments
on the line that calls sort.
So in a header (Ch4) i have the following (I have edited this code down for your sanity - the includes etc seem to be happy - the header and code are in separate files and am using vs2013 so its sorted all that out for me)
class Ch4
{
public:
int Ch4::Run();
struct Student_Info;
bool compare(const Student_Info& x, const Student_Info& y);
}
Then in the class:
struct Ch4::Student_Info
{
string name;
double midterm, final;
vector<double> homework;
};
int Ch4::Run()
{
vector<Student_Info> students;
... code that populates it
sort(students.begin(), students.end(), compare);
}
bool Ch4::compare(const Student_Info& x, const Student_Info& y)
{
return x.name < y.name;
}
when i change that line to
sort(students.begin(), students.end(), Ch4::compare);
I get an error saying its missing an argument list - but in my list of overloads it doesn't show one that takes an argument list.
So i follow its advice and use it as a reference and i get back to the original error message.
So I am confused about 2 things: 1) why doesn't my code work - how to fix it 2) What are these error messages telling me, why do they seem to talk about an overload that doesn't exist or is hidden from me?
