Overload =operator, can't get it to work - c++

Question

I am trying to overload the =operator on line 9 in the code below:
void searchContact(vector<Person> &people){
string searchTerm;
vector<Person>::iterator it;
cout << endl;
cout << "Enter search term: ";
getline(cin, searchTerm);
it = find(people.begin(), people.end(), searchTerm);
if (it != people.end()){
cout << "Element found in: " << *it << '\n';
}else{
cout << "Element not found\n";
}
}
My approach is this:
int data;
Person& operator=(Person& a) { return a; }
Person& operator=(int a) {
data = a;
return *this;
}
I am getting this error:
class.cpp:129:30: error: ‘Person& operator=(Person&)’ must be a nonstatic member function
Person& operator=(Person& a) { return a; }
^
class.cpp:130:26: error: ‘Person& operator=(int)’ must be a nonstatic member function
Person& operator=(int a) {
What is wrong with my approach, or am i doing it all wrong from the beginning?

Answer 1

First, you are overloading the wrong operator. std::find() uses operator== (comparison) instead of operator= (assignment). And, given that you are passing a std::string to std::find(), you need an operator== that takes a std::string as input, not a Person.
Second, you are trying to implement the operators as unary operators, which means they MUST be non-static members of your Person class. The compiler is complaining that they are not.
Third, if std::find() finds a match, you are passing *it to std::cout, so you need an overloaded operator<< that takes a Person for output.
Try something like this:
class Person
{
public:
...
bool operator==(const string &rhs) const
{
// compare members of *this to rhs as needed...
return ...; // true or false
}
/* alternatively:
friend bool operator==(const Person &lhs, const string &rhs)
{
// compare members of lhs to rhs as needed...
return ...; // true or false
}
*/
friend ostream& operator<<(ostream &out, const Person &p)
{
// output p to out as needed...
return out;
}
...
};
Then your search code will work:
void searchContact(vector<Person> &people)
{
cout << endl;
cout << "Enter search term: ";
string searchTerm;
getline(cin, searchTerm);
vector<Person>::iterator it = find(people.begin(), people.end(), searchTerm);
if (it != people.end()) {
cout << "Element found in: " << *it << '\n';
} else {
cout << "Element not found\n";
}
}

Answer 2

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
class Person{
private:
int data;
public:
Person(int data)
{
this->data = data;
}
int getData()
{
return data;
}
friend bool operator==( const Person &lhs, const int rhs);
};
bool operator== ( const Person &lhs, const int rhs )
{
return lhs.data == rhs;
}
void searchContact(std::vector<Person> &people){
int searchTerm = 1;
vector<Person>::iterator it;
it = find(people.begin(), people.end(), searchTerm);
if (it != people.end()){
cout << "Element found in: " << it->getData() << '\n';
}else{
cout << "Element not found\n";
}
}
int main(int argc, char **argv)
{
std::vector<Person> list1 = {1, 2, 3, 4};
std::vector<Person> list2 = {1, 2, 3, 5};
std::vector<Person> list3 = {1, 3, 7, 6, 9, 5, 2, 4};
searchContact(list1);
searchContact(list2);
searchContact(list3);
}
i don't know what do you want. please show your full code and tell what do you want.
if you want to find element in vector, you can write like this(not string. if ou want to find string, just change int to string and get data with cin or etc)