libstdc++-v3/testsuite/25_algorithms/pstl/110512.cc

   1 // { dg-do compile { target c++17 } }
   2
   3 // Bug 110512 - C++20 random access iterators run sequentially with PSTL
   4
   5 #include <algorithm>
   6 #include <execution>
   7 #include <ranges>
   8 #include <testsuite_iterators.h>
   9
  10 using InputIter = __gnu_test::input_iterator_wrapper<int>;
  11 using FwdIter = __gnu_test::forward_iterator_wrapper<long>;
  12 using RAIter = __gnu_test::random_access_iterator_wrapper<float>;
  13
  14 template<typename... Iter>
  15 constexpr bool all_random_access
  16   = __pstl::__internal::__are_random_access_iterators<Iter...>::value;
  17
  18 using __pstl::__internal::__are_random_access_iterators;
  19 static_assert( all_random_access<RAIter> );
  20 static_assert( all_random_access<int*, RAIter, const long*> );
  21 static_assert( ! all_random_access<RAIter, FwdIter> );
  22 static_assert( ! all_random_access<FwdIter, InputIter, RAIter> );
  23
  24 #if __cpp_lib_ranges
  25 using IotaIter = std::ranges::iterator_t<std::ranges::iota_view<int, int>>;
  26 static_assert( std::random_access_iterator<IotaIter> );
  27 static_assert( all_random_access<IotaIter> );
  28 static_assert( all_random_access<IotaIter, RAIter> );
  29 static_assert( all_random_access<RAIter, IotaIter> );
  30 static_assert( ! all_random_access<RAIter, IotaIter, FwdIter> );
  31 #endif