#include <string>
 #include <vector>
 #include <memory>
 #include <security/pam_modules.h>
 #include <security/pam_appl.h>
 
 #include "pam.h"
 
 class pam_conversation_impl : public pam_conversation {
     private:
         struct pam_conv *pam_conv_;
     public:
         pam_conversation_impl(pam_conv *conv) : pam_conv_(conv) {}
         int conv(const std::vector<const struct pam_message *> &prompts, std::vector<struct pam_response *> &answers);
 };
 
 class pam_impl : public pam {
     public:
         int get_conversation(pam_handle_t *pamh, std::shared_ptr<pam_conversation> &conversation);
 };
 
 int pam_impl::get_conversation(pam_handle_t *pamh, std::shared_ptr<pam_conversation> &conversation) {
     struct pam_conv *pam_conv;
     int result = pam_get_item(pamh, PAM_CONV, (const void **)&pam_conv);
     conversation.reset(new pam_conversation_impl(pam_conv));
     return result;
 }
 
 int pam_conversation_impl::conv(const std::vector<const struct pam_message *> &prompts, std::vector<struct pam_response *> &answers) {
     return pam_conv_->conv(prompts.size(), const_cast<const struct pam_message **>(prompts.data()),
             answers.data(), pam_conv_->appdata_ptr);
 }
 
 pam_p get_system_pam() {
     return (pam_p)new pam_impl;
 }