Stack.h

/*
 * Stack.h
 *
 * This file is part of Mozzi.
 *
 * Copyright 2013-2024 Tim Barrass and the Mozzi Team
 *
 * Mozzi is licensed under the GNU Lesser General Public Licence (LGPL) Version 2.1 or later.
 *
 */
 
 /** A simple stack, used internally for keeping track of analog input channels as they are read.
 This stack is really just an array with a pointer to the most recent item, and memory is allocated at compile time.
@tparam  T the kind of numbers (or other things) to store.
@tparam NUM_ITEMS the maximum number of items the stack will need to hold. 
 */
template <class T, int NUM_ITEMS>
class Stack
{
private:
    T _array[NUM_ITEMS];
    int top;
 
public:
    /** Constructor
    */
    Stack(): top(-1)
    {
    }
 
/** Put an item on the stack.
@param item the thing you want to put on the stack.
*/
    void push(T item)
    {
        if (top< (NUM_ITEMS-1)){
            top++;
            _array[top]=item;
        }
    }
 
/** Get the item on top of the stack.
@return T the item
*/
    T pop()
    {
        if(top==-1) return -1;
        T item =_array[top];
        top--;
        return item;
    }
 
};