UART Frame Builder

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

// Define class Frame with:
// - uint8_t buffer[16]
// - int size
// - operator+=
// - operator[]
// - getSize()

class Frame {
    private: 
        uint8_t buffer[16];
        int size; 
    public: 
        Frame(): size(0) {}
        Frame& operator+=(uint8_t byte) {
            if (size<16) {
                buffer[size++] = byte; 
            }
            return *this; 
        }
        uint8_t operator[](int index) const {
            return buffer[index];
        }
        int getSize() {
            return size; 
        }
};


int main() {
    int n;
    cin >> n;

    Frame frame;

    for (int i = 0; i < n; i++) {
        int b;
        cin >> b;
        frame += (uint8_t)b;
    }

    for (int i = 0; i < frame.getSize(); i++) {
        cout << (int)frame[i];
        if (i + 1 < frame.getSize()) {
            cout << " ";
        }
    }

    return 0;
}

Solving Approach