#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

// Type for queue, change to the desired type to be used in the queue
#define QUEUE_TYPE int

typedef struct queue {
    size_t length;
    QUEUE_TYPE* arr;
    size_t start;
    size_t size;
} queue_t;

queue_t queue_init(size_t length) {
    queue_t self;
    self.length = length;
    self.arr = malloc(length * sizeof(QUEUE_TYPE))
    self.start = 0;
    self.size = 0;
    return self;
}

bool enqueue(queue_t* self, QUEUE_TYPE element) {
    if (self->size == self->length) {
        return false;
    }
    self->arr[self->start + self->size] = element;
    self->size++;
    return true;
}

bool dequeue(queue_t* self, QUEUE_TYPE* destination) {
    if (self->size == 0) {
        return false;
    }
    *destination = self->arr[self->start];
    self->start = (self->start + 1) % self->length;
    self->size--;
    return true;
}

void queue_destroy(queue_t* self) {
    if (self->arr != NULL) {
        free(self->arr);
        self->arr = NULL;
    }
}