class Asyncplusplus < Formula
  desc "Concurrency framework for C++11"
  homepage "https://github.com/Amanieu/asyncplusplus"
  url "https://github.com/Amanieu/asyncplusplus/archive/v1.0.tar.gz"
  sha256 "eb2b7a900435ef10fcb62a1d364aa7b4c2ef092ebe2b6a83d0ec80904e22514d"

  bottle do
    cellar :any
    sha256 "b82364488e395452869e09a902ca4c79ee61cd241f8d5dae689545aedf6146f2" => :catalina
    sha256 "fd9a043e4c813883327b16d2ab53d44eaa0edfe97a90ada246a1ba57d46ab38b" => :mojave
    sha256 "a2c84fd99324e27a45366a41cbcc775376eeff3043f357dca2ca810fda236e1a" => :high_sierra
    sha256 "eaf0d777a614ff9a8effe1899c4468ab149c5625d8c16353415f1df24b17a311" => :sierra
  end

  depends_on "cmake" => :build

  def install
    system "cmake", ".", *std_cmake_args
    system "make", "install"
  end

  test do
    (testpath/"test.cpp").write <<~EOS
      #include <iostream>
      #include <async++.h>

      int main()
      {
          auto task1 = async::spawn([] {
              std::cout << "Task 1 executes asynchronously" << std::endl;
          });
          auto task2 = async::spawn([]() -> int {
              std::cout << "Task 2 executes in parallel with task 1" << std::endl;
              return 42;
          });
          auto task3 = task2.then([](int value) -> int {
              std::cout << "Task 3 executes after task 2, which returned "
                        << value << std::endl;
              return value * 3;
          });
          auto task4 = async::when_all(task1, task3);
          auto task5 = task4.then([](std::tuple<async::task<void>,
                                                async::task<int>> results) {
              std::cout << "Task 5 executes after tasks 1 and 3. Task 3 returned "
                        << std::get<1>(results).get() << std::endl;
          });

          task5.get();
          std::cout << "Task 5 has completed" << std::endl;

          async::parallel_invoke([] {
              std::cout << "This is executed in parallel..." << std::endl;
          }, [] {
              std::cout << "with this" << std::endl;
          });

          async::parallel_for(async::irange(0, 5), [](int x) {
              std::cout << x;
          });
          std::cout << std::endl;

          int r = async::parallel_reduce({1, 2, 3, 4}, 0, [](int x, int y) {
              return x + y;
          });
          std::cout << "The sum of {1, 2, 3, 4} is " << r << std::endl;
      }
    EOS
    system ENV.cxx, "-I#{include}", "-L#{lib}", "-lasync++", "--std=c++11", "test.cpp", "-o", "test"
    system "./test"
  end
end