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#include <iostream>
#include <memory>
#include <queue>
#include <string>
//-----------------------------------------------------------------------------
// do NOT use : using namespace std;
//-----------------------------------------------------------------------------
struct Packet
{
// moved to uint32_t for std::cout reasons.
// uint8_t is displayed as(special) characters
std::uint32_t index;
std::uint32_t message;
Packet() :
index{ next_index() },
message{ index }
{
std::cout << "created packet : " << index << "\n";
}
~Packet()
{
std::cout << "destroyed packet : " << index << "\n";
}
// small helper to not have to declare the static variable seperatly
static std::uint8_t next_index()
{
static int counter;
return counter++;
}
};
//-----------------------------------------------------------------------------
class MyObject
{
public:
void push_packet();
std::unique_ptr<Packet> pop_packet();
// this function returns a const reference (observation only)
// of the packet at the front of the queue
// while leaving the unique pointer on the queue (no moves needed
// packet will still be owned by the queue)
const Packet& front();
private:
std::queue<std::unique_ptr<Packet>> m_queue;
};
void MyObject::push_packet()
{
std::cout << "push_packet\n";
// push a packet
m_queue.push(std::make_unique<Packet>());
std::cout << "push_packet done...\n";
}
std::unique_ptr<Packet> MyObject::pop_packet()
{
std::unique_ptr<Packet> packet = std::move(m_queue.front());
m_queue.pop();
return packet;
}
const Packet& MyObject::front()
{
return *m_queue.front();
}
//-----------------------------------------------------------------------------
int main()
{
const std::size_t n_packets = 3ul;
MyObject object;
for (std::size_t n = 0; n < n_packets; ++n)
{
std::cout << "pushing packet\n";
object.push_packet();
}
for (std::size_t n = 0; n < n_packets; ++n)
{
std::cout << "packet at front : ";
std::cout << object.front().index << "\n";
std::cout << "popping front\n";
auto packet_ptr = object.pop_packet();
std::cout << "popped packet : " << packet_ptr->index << "\n";
}
return 0;
}
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