[MISC] Also check member types of both configs

Author: eseiler

include/sharg/detail/poison_config.hpp

@@ -59,12 +59,38 @@ struct poison_config_size_comp_validator : public detail::default_validator
  * \tparam validator_t The validator to use. Defaults to sharg::detail::poison_config_size_comp_validator.
  * \details
  * * Sizes of sharg::config and sharg::detail::poison_config are the same.
+ * * sharg::config and sharg::detail::poison_config have the same member types.
  * * sharg::detail::poison_config can be constructed with designated initializers from sharg::config's members.
  * * sharg::config can be constructed with designated initializers from sharg::detail::poison_config's members.
+ * The latter two ensure that the order of the members is the same.
  */
 template <typename validator_t = poison_config_size_comp_validator>
 concept poison_config_valid = (sizeof(poison_config) == sizeof(config<validator_t>))
                            && requires (config<validator_t> cfg, poison_config poison_cfg) {
+                                  {
+                                      std::same_as<decltype(cfg.short_id), decltype(poison_cfg.short_id)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.long_id), decltype(poison_cfg.long_id)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.description), decltype(poison_cfg.description)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.default_message), decltype(poison_cfg.default_message)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.advanced), decltype(poison_cfg.advanced)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.hidden), decltype(poison_cfg.hidden)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.required), decltype(poison_cfg.required)>
+                                  };
+                                  {
+                                      std::same_as<decltype(cfg.validator), decltype(poison_cfg.validator)>
+                                  };
                                   {
                                       poison_config{.short_id = cfg.short_id,
                                                     .long_id = cfg.long_id,