Added more error output to track tensor existence domain issue ...

Signed-off-by: Dmitry I. Lyakh <quant4me@gmail.com>

src/exatn/num_server.hpp

@@ -504,8 +504,10 @@ public:
              << "Tensor " << tensor_name << " violates this requirement!" << std::endl;
    const auto & tensor_domain_ranks = tensor_domain.getProcessRanks();
    const auto & other_tensors_domain_ranks = other_tensors_domain.getProcessRanks();
+   std::cout << tensor_name << ":" << std::endl;
    for(const auto & proc_rank: tensor_domain_ranks) std::cout << " " << proc_rank;
    std::cout << std::endl;
+   print_variadic_pack(std::forward<Args>(tensor_names)...); std::cout << ":" << std::endl;
    for(const auto & proc_rank: other_tensors_domain_ranks) std::cout << " " << proc_rank;
    std::cout << std::endl;
    assert(false);

src/utils/errors.hpp

 /** ExaTN: Error handling
-REVISION: 2020/10/22
+REVISION: 2021/09/27
 
-Copyright (C) 2018-2020 Dmitry I. Lyakh (Liakh)
-Copyright (C) 2018-2020 Oak Ridge National Laboratory (UT-Battelle) **/
+Copyright (C) 2018-2021 Dmitry I. Lyakh (Liakh)
+Copyright (C) 2018-2021 Oak Ridge National Laboratory (UT-Battelle) **/
 
 #ifndef EXATN_ERRORS_HPP_
 #define EXATN_ERRORS_HPP_
@@ -45,6 +45,18 @@ inline void make_sure(bool condition,
  return;
 }
 
+inline void print_variadic_pack()
+{
+ return;
+}
+
+template <typename Arg, typename... Args>
+inline void print_variadic_pack(Arg&& arg, Args&&... args)
+{
+ std::cout << std::forward<Arg>(arg) << " ";
+ return print_variadic_pack(std::forward<Args>(args)...);
+}
+
 } //namespace exatn
 
 #endif //EXATN_ERRORS_HPP_