when_any.cpp

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/**
 * \example when_any.cpp
 * Simple WhenAny examples
 */
#include <yaclib/async/run.hpp>
#include <yaclib/async/when_any.hpp>
#include <yaclib/runtime/fair_thread_pool.hpp>
#include <yaclib/util/intrusive_ptr.hpp>
#include <yaclib/util/result.hpp>
 
#include <chrono>
#include <iostream>
#include <type_traits>
#include <utility>
#include <vector>
 
#include <gtest/gtest.h>
 
namespace test {
namespace {
 
using namespace std::chrono_literals;
 
// Any combinator:
// std::vector<Future<T>> -> Future<T>
 
TEST(Example, WhenAny) {
  yaclib::FairThreadPool tp{4};
 
  std::vector<yaclib::FutureOn<int>> futs;
 
  // Run sync computations in parallel
 
  for (int i = 0; i < 5; ++i) {
    futs.push_back(yaclib::Run(tp, [i]() -> int {
      return i;
    }));
  }
 
  // Parallel composition
  // Any combinator: std::vector<Future<T>> -> Future<T>
  // Non-blocking!
  yaclib::Future<int> any = WhenAny(futs.begin(), futs.size());
 
  // First value
  std::cout << "Any value: " << std::move(any).Get().Ok() << std::endl;
 
  tp.Stop();
  tp.Wait();
}
 
}  // namespace
}  // namespace test