NASA Ocean Color

ocssw V2022

 #ifndef FIND_VARIABLE_HPP
 #define FIND_VARIABLE_HPP
 #include <netcdf>
 #include <unordered_set>
  
 template <typename T>
 netCDF::NcVar find_nc_variable_cpp(const std::string& var_name, T& nc_file) {
     netCDF::NcVar var = nc_file.getVar(var_name);
     if (var.isNull()) {
         auto grps = nc_file.getGroups();
         for (const auto& grp : grps) {
             var = find_nc_variable_cpp(var_name, grp.second);
             if (!var.isNull()) {
                 return var;
             }
         }
     }
     return var;
 }
  
 template <typename T>
 netCDF::NcGroupAtt find_nc_grp_attribute_cpp(const std::string& att_name, T& nc_file) {
     netCDF::NcGroupAtt attr = nc_file.getAtt(att_name);
     if (attr.isNull()) {
         auto grps = nc_file.getGroups();
         for (const auto& grp : grps) {
             attr = find_nc_grp_attribute_cpp(att_name, grp.second);
             if (!attr.isNull()) {
                 return attr;
             }
         }
     }
     return attr;
 };
  
 template <typename T>
 std::multimap<std::string, netCDF::NcVar> find_all_variables(T& nc_id) {
     auto grps = nc_id.getGroups();
     std::multimap<std::string, netCDF::NcVar> vars = nc_id.getVars();
     for (const auto& grp : grps) {
         std::multimap<std::string, netCDF::NcVar> temp_var = find_all_variables(grp.second);
         vars.insert(temp_var.begin(), temp_var.end());
     }
     return vars;
 }
  
 template <typename T>
 std::multimap<std::string, netCDF::NcVar> find_all_variables(T& nc_id,
                                                              const std::unordered_set<std::string>& names) {
     auto grps = nc_id.getGroups();
     std::multimap<std::string, netCDF::NcVar> vars = nc_id.getVars();
     for (const auto& grp : grps) {
         std::multimap<std::string, netCDF::NcVar> temp_var = find_all_variables(grp.second);
         for (const auto& nc_var : temp_var) {
             if (!names.count(nc_var.first))
                 vars.insert(nc_var);
         }
     }
     return vars;
 }
  
 std::multimap<std::string, netCDF::NcVar> find_variables_geo_physical(const std::string& nc_path,
                                                                       std::string& prod_list);
 #endif