{

#if ! defined BOOST_NO_CXX11_LAMBDAS && ! (defined BOOST_MSVC && _MSC_VER < 1700)

boost::promise<int> prom;

boost::future<int> futr = prom.get_future();

int callCount = 0;

boost::future<void> futr2 = futr.then(boost::launch::deferred,

[&] (boost::future<int> f) {

callCount++;

assert(f.valid());

assert(f.is_ready());

assert(17 == f.get());

});

assert(futr2.valid());

assert(!futr2.is_ready());

assert(0 == callCount);

prom.set_value(17);

assert(0 == callCount);

futr2.get();

assert(1 == callCount);

#endif

return 0;