static bool erase_vorbis_stream(const future<vector<float>>& fut)
{
return !fut.valid();
}
shared_future(const shared_future& rhs)
: state(rhs.state)
, listener(state ? state->add_listener() : future<bool>())
{
assert(listener.valid());
}
bool valid() const { return listener.valid(); }
shared_future(future<T>&& future)
: state(new shared_state_multiplexer<T>(std::move(future)) )
, listener(state->add_listener())
{
assert(listener.valid());
}
