Question

What am I doing wrong?

#include <iostream>
#include <deque>
using namespace std;

struct mystruct {
       int number1;
       int number2;
};

int main() {
    std::deque<mystruct> mydeque;

    mydeque.number1.push_front(77);

    return 0;
}

Answer 1

push_front is a method of deque not the number1 of structure mystruct..

The right way is :

struct mystruct {
       int number1;
       int number2;
mystruct(int n1, int n2) : number1(n1), number2(n2){}
};

int main() {
    std::deque<mystruct> mydeque;

    mydeque.push_front(mystruct(77,88));

    return 0;
}