.. _program_listing_file_src_pcms_utility_common.h:

Program Listing for File common.h
=================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_pcms_utility_common.h>` (``src/pcms/utility/common.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef PCMS_COUPLING_COMMON_H
   #define PCMS_COUPLING_COMMON_H
   #include "pcms/utility/assert.h"
   #include <map>
   #include <string>
   #include <vector>
   #include <algorithm>
   
   namespace pcms
   {
   
   namespace detail
   {
   // helper function for dealing with field maps
   template <typename T, typename U>
   auto& find_or_error(const std::string& name, const std::map<T, U>& map)
   {
     auto it = map.find(name);
     PCMS_ALWAYS_ASSERT(it != map.end());
     return it->second;
   }
   
   template <typename T, typename U>
   auto& find_or_error(const std::string& name, std::map<T, U>& map)
   {
     auto it = map.find(name);
     PCMS_ALWAYS_ASSERT(it != map.end());
     return it->second;
   }
   template <typename T, typename U>
   auto find_many_or_error(const std::vector<T>& keys, const std::map<T, U>& map)
   {
   
     std::vector<std::reference_wrapper<U>> results;
     results.reserve(keys.size());
     std::transform(keys.begin(), keys.end(), std::back_inserter(results),
                    [&map](const std::string& key) {
                      return std::ref(detail::find_or_error(key, map));
                    });
     return results;
   }
   template <typename T, typename U>
   auto find_many_or_error(const std::vector<T>& keys, std::map<T, U>& map)
   {
   
     std::vector<std::reference_wrapper<U>> results;
     results.reserve(keys.size());
     std::transform(keys.begin(), keys.end(), std::back_inserter(results),
                    [&map](const std::string& key) {
                      return std::ref(detail::find_or_error(key, map));
                    });
     return results;
   }
   } // namespace detail
   } // namespace pcms
   
   #endif // PCMS_COUPLING_COMMON_H