boost/libs/thread/test/sync/futures/packaged_task/get_future_pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// Copyright (C) 2011 Vicente J. Botet Escriba
//
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// <boost/thread/future.hpp>

// class packaged_task<R>

// future<R> get_future();


#define BOOST_THREAD_VERSION 4
#if BOOST_THREAD_VERSION == 4
#define BOOST_THREAD_DETAIL_SIGNATURE double()
#else
#define BOOST_THREAD_DETAIL_SIGNATURE double
#endif

#include <boost/thread/future.hpp>
#include <boost/detail/lightweight_test.hpp>

class A
{
    long data_;

public:
    explicit A(long i) : data_(i) {}

    long operator()() const {return data_;}
    long operator()(long i, long j) const {return data_ + i + j;}
};

int main()
{
  {
      boost::packaged_task<BOOST_THREAD_DETAIL_SIGNATURE> p(A(5));
      boost::future<double> f = BOOST_THREAD_MAKE_RV_REF(p.get_future());
      //p(3, 'a');
      p();
      BOOST_TEST(f.get() == 5.0);
  }
  {
      boost::packaged_task<BOOST_THREAD_DETAIL_SIGNATURE> p(A(5));
      boost::future<double> f = BOOST_THREAD_MAKE_RV_REF(p.get_future());
      try
      {
          f = BOOST_THREAD_MAKE_RV_REF(p.get_future());
          BOOST_TEST(false);
      }
      catch (const boost::future_error& e)
      {
          BOOST_TEST(e.code() ==  boost::system::make_error_code(boost::future_errc::future_already_retrieved));
      }
  }
  {
      boost::packaged_task<BOOST_THREAD_DETAIL_SIGNATURE> p;
      try
      {
          boost::future<double> f = BOOST_THREAD_MAKE_RV_REF(p.get_future());
          BOOST_TEST(false);
      }
      catch (const boost::future_error& e)
      {
          BOOST_TEST(e.code() ==  boost::system::make_error_code(boost::future_errc::no_state));
      }
  }

  return boost::report_errors();
}