bool mod_acceleration(PlayerType *player_ptr, const TIME_EFFECT v, const bool do_dec);
bool set_shield(PlayerType *player_ptr, TIME_EFFECT v, bool do_dec);
bool set_magicdef(PlayerType *player_ptr, TIME_EFFECT v, bool do_dec);
bool mod_acceleration(PlayerType *player_ptr, const TIME_EFFECT v, const bool do_dec);
bool set_shield(PlayerType *player_ptr, TIME_EFFECT v, bool do_dec);
bool set_magicdef(PlayerType *player_ptr, TIME_EFFECT v, bool do_dec);