run.h

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// uvco (c) 2025 Lewin Bormann. See LICENSE for specific terms.
 
#pragma once
 
#include "uvco/loop/loop.h"
#include "uvco/promise/promise.h"
 
namespace uvco {

 
class Loop;
 
// Forward declaration only for friend declaration.
template <typename F, typename R>
concept MainFunction = std::is_invocable_r_v<Promise<R>, F, const Loop &>;
 
template <typename R, MainFunction<R> F> R runMain(F main);

template <typename R, MainFunction<R> F> R runMain(F main) {
  Loop loop;
  Promise<R> promise = main(loop);
  runLoop(loop);
  // Returns when libuv does not see any handles left, and neither
  // are any promises ready.
  return promise.unwrap();
}

 
} // namespace uvco