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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // UNSUPPORTED: libcpp-has-no-threads
     11 
     12 // <future>
     13 
     14 // class shared_future<R>
     15 
     16 // shared_future();
     17 
     18 #include <future>
     19 #include <cassert>
     20 
     21 int main()
     22 {
     23     {
     24         std::shared_future<int> f;
     25         assert(!f.valid());
     26     }
     27     {
     28         std::shared_future<int&> f;
     29         assert(!f.valid());
     30     }
     31     {
     32         std::shared_future<void> f;
     33         assert(!f.valid());
     34     }
     35 }
     36