thread/test/test_10963.cpp at develop · boostorg/thread · GitHub

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// 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)

#define BOOST_THREAD_VERSION 4

#include <boost/config.hpp>

#if ! defined BOOST_NO_CXX11_DECLTYPE

#define BOOST_RESULT_OF_USE_DECLTYPE

#endif

#define BOOST_THREAD_PROVIDES_EXECUTORS

#include <boost/thread/future.hpp>

#include <boost/static_assert.hpp>

#include <cassert>

#include <boost/thread/executors/basic_thread_pool.hpp>

#include <boost/type_traits/is_same.hpp>

struct TestCallback

{

typedef boost::future<void> result_type;

result_type operator()(boost::future<void> future) const

{

assert(future.is_ready());

future.get();

return boost::make_ready_future();

}

result_type operator()(boost::future<boost::future<void> > future) const

{

assert(future.is_ready());

future.get();

return boost::make_ready_future();

}

};

int main()

{

#if ! defined BOOST_NO_CXX11_DECLTYPE && ! defined BOOST_NO_CXX11_AUTO_DECLARATIONS

{

boost::promise<void> test_promise;

boost::future<void> test_future(test_promise.get_future());

auto f1 = test_future.then(TestCallback());

BOOST_STATIC_ASSERT(boost::is_same<decltype(f1), boost::future<boost::future<void> > >::value);

auto f2 = f1.then(TestCallback());

BOOST_STATIC_ASSERT(boost::is_same<decltype(f2), boost::future<boost::future<void> > >::value);

}

{

boost::basic_thread_pool executor;

boost::promise<void> test_promise;

boost::future<void> test_future(test_promise.get_future());

auto f1 = test_future.then(executor, TestCallback());

BOOST_STATIC_ASSERT(boost::is_same<decltype(f1), boost::future<boost::future<void> > >::value);

auto f2 = f1.then(executor, TestCallback());

BOOST_STATIC_ASSERT(boost::is_same<decltype(f2), boost::future<boost::future<void> > >::value);

}

#endif

return 0;

}

thread/test/test_10963.cpp at develop · boostorg/thread · GitHub

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