overload vector find

[gonza8888]

I have this programm, but says me :

test.cpp:22:43: error: no matching function for call to ‘find(std::vector<std::vector<double> >::iterator, std::vector<std::vector<double> >::iterator, std::vector<double>&)’

I think I have to overload the operator, but I don't know exactly where and how to do it.

Someone can tell me?
Thanks!

#include <iostream>
#include <vector>

int main ()
{
	std::vector< std::vector<double> > vec;
	
	
	std::vector<double> p;
	p.push_back(1);
	p.push_back(2);
	p.push_back(3);
	
	vec.push_back(p);
	
	std::vector<double> p1;
	p1.push_back(1);
	p1.push_back(2);
	p1.push_back(3);
	
	if ( std::find(vec.begin(), vec.end(), p1) != vec.end())
		cout << "Found" << endl;
	else
		cout << "NULL" << endl;

  return 0;
}

[vlad from moscow]

You shall include header <algorithm>