gistfile1.hpp

void setAllProducts(vector<Product> &products)
{
  vector<char> raw_products(products.size() * sizeof(Product));
  memcpy(&raw_products[0], &products[0], products.size() * sizeof(Product));
  MyCache::singleton().set("AllProducts", raw_products);
}

vector<Product> getAllProducts()
{
  vector<char> raw_products = MyCache::singleton().get("AllProducts");
  if (! raw_products.empty())
  {
    vector<Product> products(raw_products.size() / sizeof(Product));
    memcpy(&products[0], &raw_products[0], raw_products.size());
    return products
  }
  /* obtain from persistent store */
  vector<Product> products= getAllProductsFromStore();
  if (! products.empty())
  {
    setAllProducts(products);
  }
  return products;
}

Product getProduct(const string &key)
{
  vector<char> raw_product= MyCache::singleton().get(key);
  Product ret;
  if (! raw_product.empty())
  {
    memcpy(&ret, &raw_product[0], sizeof(Product));
  }
  else
  {
    /* retrieve it from the persistent store */
  }
  return ret;
}

void setProduct(const string &key, const Product &product)
{
  vector<char> raw_product(sizeof(Product));
  memcpy(&raw_product[0], &product, sizeof(Product));
  MyCache::singleton().set(key, raw_product);
}