Experiment with coroutines and cppcoro

coro_example.cpp

using namespace cppcoro;

static const std::filesystem::path testCSS{"../test_res/style.css"};
static const std::filesystem::path testHTML{"../test_res/index.html"};

using DataBuffer = std::unique_ptr<std::uint8_t[]>;

task<DataBuffer> ReadFile(const std::filesystem::path& p)
{
  DataBuffer result = std::make_unique<std::uint8_t[]>(len);
  //Actual file loading happens here...
  co_return result;
}

struct Document
{
  DataBuffer HTMLData;
  DataBuffer CSSData;

  void MakeDOM()
  {
    std::cout << "Document created" << std::endl;
  }
};

task<Document> CreateDocument(static_thread_pool& pool)
{
  std::cout << "Creating document on thread " << std::this_thread::get_id() << std::endl;

  auto readHTML = ReadFile(testHTML);
  auto readCSS = ReadFile(testCSS);

  Document result;
  std::tie(result.HTMLData, result.CSSData) = std::move(co_await when_all(
    schedule_on(pool, std::move(readHTML)),
    schedule_on(pool, std::move(readCSS))));

  result.MakeDOM();
  
  co_return result;
} 

Document BuildDocument(static_thread_pool& pool)
{
  return sync_wait(CreateDocument(pool));
}

int main()
{
  static_thread_pool pool;
  auto document = BuildDocument(pool);

  return 0;
}