Function main

examples/hello_world.cpp:26–61

using stdexec::sync_wait;

auto main() -> int
{
  exec::static_thread_pool ctx{8};
  scheduler auto           sch = ctx.get_scheduler();  // 1

  sender auto begin = schedule(sch);  // 2
  sender auto hi_again = then(                                           // 3
    begin,                                                               // 3
    [] {                                                                 // 3
      std::cout << "Hello world! Have an int.\n";                        // 3
      return 13;                                                         // 3
    });                                                                  // 3

  sender auto add_42 = then(hi_again, [](int arg) { return arg + 42; });  // 4
  auto [i]           = sync_wait(std::move(add_42)).value();              // 5
  std::cout << "Result: " << i << std::endl;

  // Sync_wait provides a run_loop scheduler
  std::tuple<run_loop::scheduler> t = sync_wait(get_scheduler()).value();
  (void) t;

  auto y = let_value(get_scheduler(),
                     [](auto sched)
                     {
                       return starts_on(sched,
                                        then(just(),
                                             []
                                             {
                                               std::cout << "from run_loop\n";
                                               return 42;
                                             }));
                     });
  sync_wait(std::move(y));

  sync_wait(when_all(just(42), get_scheduler(), get_stop_token()));
}