cppLib.cpp

#include "CppLib.h"
#include <iostream>
#include <cassert>
using namespace std;
// Quantity of elements to add
// when increasing storage:
const int increment = 100;

void Stash::initialize(int sz) {
  size = sz;
  quantity = 0;
  storage = 0;
  next = 0;
}

int Stash::add(const void* element) {
  if(next >= quantity) // Enough space left?
    inflate(increment);

  // Copy element into storage,
  // starting at next empty space:
  int startBytes = next * size;
  unsigned char* e = (unsigned char*)element;
  for(int i = 0; i < size; i++)
    storage[startBytes + i] = e[i];

  next++;
  return(next - 1); // Index number
}

void* Stash::fetch(int index) {
  // Check index boundaries:
  assert(0 <= index);
  if(index >= next)
    return 0; // To indicate the end
  // Produce pointer to desired element:
  return &(storage[index * size]);
}

int Stash::count() {
  return next; // Number of elements in CStash
}

void Stash::inflate(int increase) {
  assert(increase > 0);

  int newQuantity = quantity + increase;
  int newBytes = newQuantity * size;
  int oldBytes = quantity * size;
  unsigned char* b = new unsigned char[newBytes];

  for(int i = 0; i < oldBytes; i++)
    b[i] = storage[i]; // Copy old to new

  delete []storage; // Old storage
  storage = b; // Point to new memory
  quantity = newQuantity;
}

void Stash::cleanup() {
  if(storage != 0) {
    cout << "freeing storage" << endl;
    delete []storage;
  }
}