user var service

my_plugin_user_var_service.cc

#include "mysql/service_my_plugin_user_var.h"
SERVICE_VERSION *user_var_service= (void*)VERSION_user_var;;
bool get_var(THD* thd, const String name, String* value) {
  return false;
}
bool set_var(THD* thd, const String name, const String value) my_plugin_user_var_service->set_var(thd, name, value) {
  return false;
}

service_my_plugin_user_var.h

#ifndef MYSQL_SERVICE_USER_VAR_INCLUDED
#include "sql/sql_class.h"
#include "sql/item.h"
#include "sql/item_func.h"
#include "service_versions.h"

/**
  @file
  *exhaustive* description of the interface you provide.
  This file is the main user documentation of the new service
*/
#ifdef __cplusplus
extern "C" {
#endif

extern struct my_plugin_user_var_service_st {
  bool (*get_var)(THD* thd, const String name, String* value);
  bool (*set_var)(THD* thd, const String name, const String value);
} *my_plugin_user_var_service;

#ifdef MYSQL_DYNAMIC_PLUGIN

#define get_var(THD* thd, const String name, String* value) my_plugin_user_var_service->get_var(thd, name, value)
#define set_var(THD* thd, const String name, const String value) my_plugin_user_var_service->set_var(thd, name, value)

#else


#endif

#ifdef __cplusplus
}
#endif

#define MYSQL_SERVICE_USER_VAR_INCLUDED
#endif