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ee609e8806
1. Make inclusion of boost/bind/bind.hpp conditional in some cases, when the code actually conditionally uses boost::bind. Reduces compile-time overhead and fixes https://github.com/boostorg/thread/issues/307. 2. Remove some unnecessary uses of boost::ref. This allows to avoid including boost/core/ref.hpp in a few places, and avoids the associated template instantiation overhead in others. 3. Replace deprecated header includes with the more recent alternatives. For example: boost/detail/lightweight_test.hpp -> boost/core/lightweight_test.hpp, boost/ref.hpp -> boost/core/ref.hpp. 4. Replace some blanket includes with the more fine-grained ones. For example, boost/utility.hpp, boost/atomic.hpp. This reduces compile time overhead. 5. Add some missing includes, for example, boost/core/ref.hpp and boost/type_traits/is_same.hpp. 6. Replace uses of std::is_same with boost::is_same (with the corresponding included header) since the standard type_traits header presence and validity is not tested by the code. Using boost::is_same makes the code more portable.
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// Copyright (C) 2014 Vicente Botet
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#define BOOST_THREAD_VERSION 4
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#include <boost/config.hpp>
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#if ! defined BOOST_NO_CXX11_DECLTYPE
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#define BOOST_RESULT_OF_USE_DECLTYPE
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#endif
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#define BOOST_THREAD_PROVIDES_EXECUTORS
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#include <boost/thread/future.hpp>
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#include <boost/static_assert.hpp>
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#include <cassert>
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#include <boost/thread/executors/basic_thread_pool.hpp>
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#include <boost/type_traits/is_same.hpp>
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struct TestCallback
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{
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typedef boost::future<void> result_type;
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result_type operator()(boost::future<void> future) const
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{
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assert(future.is_ready());
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future.get();
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return boost::make_ready_future();
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}
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result_type operator()(boost::future<boost::future<void> > future) const
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{
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assert(future.is_ready());
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future.get();
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return boost::make_ready_future();
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}
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};
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int main()
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{
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#if ! defined BOOST_NO_CXX11_DECLTYPE && ! defined BOOST_NO_CXX11_AUTO_DECLARATIONS
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{
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boost::promise<void> test_promise;
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boost::future<void> test_future(test_promise.get_future());
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auto f1 = test_future.then(TestCallback());
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BOOST_STATIC_ASSERT(boost::is_same<decltype(f1), boost::future<boost::future<void> > >::value);
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auto f2 = f1.then(TestCallback());
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BOOST_STATIC_ASSERT(boost::is_same<decltype(f2), boost::future<boost::future<void> > >::value);
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}
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{
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boost::basic_thread_pool executor;
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boost::promise<void> test_promise;
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boost::future<void> test_future(test_promise.get_future());
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auto f1 = test_future.then(executor, TestCallback());
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BOOST_STATIC_ASSERT(boost::is_same<decltype(f1), boost::future<boost::future<void> > >::value);
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auto f2 = f1.then(executor, TestCallback());
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BOOST_STATIC_ASSERT(boost::is_same<decltype(f2), boost::future<boost::future<void> > >::value);
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}
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#endif
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return 0;
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}
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