pushing structure variable in queue - c++

Question

#include <iostream>
#include <queue>
using namespace std;
int main () {
struct process {
int burst;
int ar;
};
int x=4;
process a[x];
queue <string> names; /* Declare a queue */
names.push(a[1]);
return 0;
}
I'm trying to pushing struct variable in queue but its not taking it and gives errors
no matching function for #include queue and invalid argument
how can I do that?

Answer 1

C++ is a strongly typed language. In the line names.push(a[1]); you are trying to push a struct (from your process a[x]; array) into a queue<string>. Your struct is not a string, so the compiler will emit an error. You at least need a queue<process>.
Other issues: variable length arrays are not standard C++ (process a[x];). Use a std::vector<process> instead. Here is some simple example that works:
#include <iostream>
#include <queue>
#include <string>
#include <vector>
using namespace std;
int main () {
struct process // move this outside of main() if you don't compile with C++11 support
{
int burst;
int ar;
};
vector<process> a;
// insert two processes
a.push_back({21, 42});
a.push_back({10, 20});
queue <process> names; /* Declare a queue */
names.push(a[1]); // now we can push the second element, same type
return 0; // no need for this, really
}
EDIT
Locally defined classes/structs used to instantiate templates are valid only in C++11 and later, see e.g. Why can I define structures and classes within a function in C++? and the answers within. If you don't have access to a C++11 compliant compiler, then move your struct definition outside of main().