LIFObuf.h

/*
  LIFObuf.h - It is a simple lightweight LIFO buffer library for the Arduino.
  It is written in C++, and can easily be modified to work with other platforms.  
  It can buffer any fixed size object (ints, floats, structs, etc...).
  Created by Pavel Pervushkin, March, 2024.
  https://pervu.github.io/
  MIT License
*/

#ifndef __LIFObuf__
#define __LIFObuf__

#include <Arduino.h>

template <typename T>
class LIFObuf {
private:
    int _top;
    size_t _bufferSize;
    T* _buffer;

public:
    LIFObuf(size_t bufferSize)
    {
        _top = 0;
        _bufferSize = bufferSize;
        _buffer = new T[bufferSize];
    }

    ~LIFObuf()
    {
        if (_buffer != nullptr){
            delete[] _buffer;
        }
    }

    bool push(T data)
    {
        if (_top == _bufferSize) {
            return false;
        } 
        else 
        {
            _buffer[_top] = data;
            _top++;
            return true;
        }
    }

    T pop()
    {
        if (_top <= 0)
        {
            return T();
        } 
        else
        {
            _top--;
            T data = _buffer[_top];
            return data;
        }
    }

    T at(int index)
    {
        if (index < _top) 
        {
            return _buffer[index];
        }
        else
        {
            return T();
        }
    }    

    size_t size()
    {
        return _top;
    }

    void clear()
    {
        _top = 0;
    }

};

#endif