Print STL

[victorio]

How I can to create an ostream operator << in this case

#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
using std::vector;

class lista {
public:
	int number;
	string name;
};

vector<lista> telephonelist;
void inclusao() {
	lista e;
	int n;
	string name, number;
	cout << "Input the number of contacts: " << endl;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cout << "Input the name: " << endl;
		cin >> e.name;
		cout << "Input the number: " << endl;
		cin >> e.number;
		telephonelist.push_back(e);
	}
}
bool ordenaAux(lista playerObj, lista playerObj2) {
	return playerObj.name < playerObj2.name;
}
void ordena() {
	sort(telephonelist.begin(), telephonelist.end(), ordenaAux);
}

int main() {
	vector<lista> telephonelist;
	inclusao();
	ordena();
	for (unsigned i = 0; i < telephonelist.size(); ++i) {
		cout << telephonelist[i] << endl;
	}
}

[deleted account xyzzy]

Are you trying to overload operator<< so a vector can be inserted into the output stream as easily as a regular data type, say an int?

#include <iostream>
#include <vector>
#include <string>

template <typename T>
std::ostream& operator<<(std::ostream&, const std::vector<T>&);

int main()
{
   std::vector<int> ivec { 3, 5, 10, 6, 14, 99, 128 };

   std::cout << ivec << "\n\n";

   std::vector<std::string> svec { "One", "Two", "Three", "Four", "Five" };

   std::cout << svec << '\n';
}


template <typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& v)
{
   for (auto const& x : v)
   {
      os << x << ' ';
   }

   return os;
}

3 5 10 6 14 99 128

One Two Three Four Five

I created the function as a template overload so any data type that can use std::cout can use the overload.

Even a custom class as long as you have an operator<< overload to print any data members the class contains.