output.txt

main.cpp: In function 'int main()':
main.cpp:10:58: error: no matching function for call to 'for_each_n(std::vector<int>::iterator, int, main()::<lambda(auto:1&)>)'
   10 |     std::for_each_n(ns.begin(), 3, [](auto& n){ n *= 2; });
      |                                                          ^
In file included from /usr/local/include/c++/9.2.0/algorithm:71,
                 from main.cpp:1:
/usr/local/include/c++/9.2.0/pstl/glue_algorithm_defs.h:46:1: note: candidate: 'template<class _ExecutionPolicy, class _ForwardIterator, class _Size, class _Function> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator> std::for_each_n(_ExecutionPolicy&&, _ForwardIterator, _Size, _Function)'
   46 | for_each_n(_ExecutionPolicy&& __exec, _ForwardIterator __first, _Size __n, _Function __f);
      | ^~~~~~~~~~
/usr/local/include/c++/9.2.0/pstl/glue_algorithm_defs.h:46:1: note:   template argument deduction/substitution failed:
main.cpp:10:58: note:   candidate expects 4 arguments, 3 provided
   10 |     std::for_each_n(ns.begin(), 3, [](auto& n){ n *= 2; });
      |                                                          ^