Fifo Buffer - c++

fifo.cpp

#include <fifo.h>

// Buffer head is always kept on the first available(empty) element of the buffer
// it is not kept on the last written element!

void fifo_push(fifo_controller_t *controller, float value)
{
	// Write to current head
	controller->arr[controller->head] = value;

	// Circlar
	if (++controller->head >= controller->len)
		controller->head -= controller->len;

	// Push tail forward if head reached it
	if (controller->tail == controller->head)
		controller->tail++;
}

// TODO: block read right after init
float fifo_read(fifo_controller_t *controller)
{
	float value = controller->arr[controller->tail];
	int lastTail = controller->tail;

	// Circlar
	if (++controller->tail >= controller->len)
		controller->tail -= controller->len;
	
	// Revert tail increment if it lands on head
	if (controller->tail == controller->head)
		controller->tail = lastTail;

	return value;
}

fifo.h

// fifo.h
#pragma once

struct fifo_controller_t {
	const int len;
	float *arr;
	int head;
	int tail;
} ;

// Push float to buffer
void fifo_push(fifo_controller_t *controller, float value);
// Read float from buffer
float fifo_read(fifo_controller_t *controller);