Operators for classes in C++ - c++

Question

I want to clear a priority vector class, which works like priority_queue but is vector based. I want to use [] operator for accessing an element of the vector, I did something but the program just keep crashing. Any suggestions?
#include<iostream>
#include<vector>
#include<typeinfo>
using namespace std;
string first (string a, string b){
int siz = min(a.size(), b.size());
int place = 0;
while (a[place]==b[place] && place<siz){
place++;
}
if (a[place]>b[place]){
return b;
}
else if (a[place]<b[place]){
return a;
}
}
template <class type>
class priority_vector{
public:
type check;
string check2;
vector <type> pv;
bool isString(){
if (typeid(type).name()==typeid(check2).name()){return true;}
else {return false;}
}
void push_in(type input){
if (isString()){
if (pv.size()==0){
pv.push_back(input);
}
else{
vector <type> :: iterator vit;
vit = pv.begin();
while (first(*pv, input)==*pv){
pv ++;
}
vit.insert(vit, input);
}
}
else{
if(pv.size()==0){
pv.push_back(input);
}
else{
vector <type> :: iterator vit;
vit = pv.begin();
while (*pv<input){
pv++;
}
vit.insert(vit, input);
}
}
}
type operator[](int a){
return pv[a];
}
};
int main(){
priority_vector <string> v_s;
int n;
cin>>n;
int in;
for (int i=0; i<n; i++){
cin>>n;
v_s.push_in(n);
}
for (int i=0; i<n; i++){
cout<<v_s[i];
}
return 0;
}

Answer 1

The std::priority_queue container adaptor by default uses std::vector. What's more interesting is that std::priority_queue is actually one of the few standard classes designed to be inherited.
That means you can easily do something like
template<typename T>
class priority_vector : public std::priority_queue<T>
{
public:
// Constructors...
T const& operator[](size_t idx) const
{
return c[idx];
}
T& operator[](size_t idx)
{
return c[idx];
}
};