//planet.h
#include <iostream>
#include <fstream>
using namespace std;
class Planet {
private:
    char* name;
public:
    Planet(int l_name = 20);
    ~Planet();
    char* getName() {
        return name;
    }
    void setName(char* str) {
        strcpy(name,str);

    static int search_db(Planet*&, int&);

    friend bool operator==(Planet&, char*&);
};

//planet.cpp
bool operator==(Planet& first, char*& second) {

    if (strlen(first.getName()) != strlen(second)) return false;
    for (int t = 0; t < strlen(first.getName()); t++) {
        if (first.getName()[t] != second[t]) {
            return false;
        }
    }
    return true;
}

int Planet::search_db(Planet*& planets, int& Size) {
    char* name_d = new char[name_l];
    int flag = 0, ind;
    cin >> name_d;
    for (int i = 0; i < Size; i++) {
        if (planets[i].name == name_d) { // здесь использую перегрузку
            ind = i;
            return ind;
        }
    }
    return -1;
}