Thread: Sorting STL Vector of Pointers (Split)

Thanks for the quick answer! And sorry, next time I will open a new thread...

Anyway I still haven't solved the problem...
I'm using this structure

Code:

struct Compare {
	bool operator ()(Function *f1, Function *f2) { return *f1 < *f2; }
};

and the operator

Code:

bool Function::operator<(Function& f1)
{
	bool b;
	b= this->get_value() < (f1.get_value());
	return b;
}

As before, putting the structure in main.cpp just before int main{} it works perfectly...but if I write it only in Function.hh when i perform the sort (std::sort(v.begin(),v.end(),Compare())) i get the error "Compare was not declared in this scope". I think I miss something that I shohld write, but I don't know where..

I also think it should work!
Yes, of course, here they are...
I just noticed that I forgot something: Fuction is designed as an abstract class (then of "type" Function I have FLineare, FExponential...). Maybe this is the problem, I still don't have very clear what i can do with abstract classes..

Code:

#ifndef Funzione_HH
#define Funzione_HH
#include "Dato.hh"
#include <vector>
#include <iostream>
using namespace std;
class Function
{
	protected:
		vector<Dato> a;
		double chi;
	public:
		Function();
		Function(vector<Dato> coeff,double c);
		virtual ~Function(){};
	
		//METODI;
		virtual double YValue(double x)=0;
		vector<Dato> Coefficients();
		double get_value();
		bool operator<(Function f1);

	struct Compare {
		bool operator ()(Function *f1, Function *f2) { return *f1 < *f2; }
	};
	
};
# endif

Code:

#include "Function.hh"
using namespace std;
Function::Function()
{}
Function::Function(vector<Dato> coeff,double c)
{
	a=coeff;
	chi=c;
}
vector<Dato> Function::Coefficients()
{
	return a;
}
double Function::get_value()
{
	return chi;
}


bool Function::operator<(Funzione& f1)
{
	bool b;
	b= this->get_value() < (f1.get_value());
	return b;
}

And in the end the main

Code:

int main{

vector<Function*> functions;

// calculations to fill the vector..

std::sort(functions.begin(),functions.end(),Compare());

}

The only error i get when i compile is "main.cpp: Compare was not declared in this scope"..

Ok I didn't know I could do like this!
thank you very much for the help, now it works, finally!