C/C++ Question How to use a structure

    typedef struct {
        uint8_t    reg_1d;   ///< Value for register RH_RF95_REG_1D_MODEM_CONFIG1
        uint8_t    reg_1e;   ///< Value for register RH_RF95_REG_1E_MODEM_CONFIG2
        uint8_t    reg_26;   ///< Value for register RH_RF95_REG_26_MODEM_CONFIG3
    } ModemConfig;

    void setModemRegisters(const ModemConfig* config);

    void RF95::SetModemRegisters(byte Reg_1D, byte Reg_1E, Byte Reg26) {
        const RH_RF95->ModemConfig mc;
        mc.reg_1d = Reg_1D;
        mc.reg_1e = Reg_1D;
        mc.reg_26 = Reg26;
        rf95->setModemRegisters(mc);
    }

ModemConfig mc;
        mc.reg_1d = Reg_1D;
        mc.reg_1e = Reg_1E;
        mc.reg_26 = Reg26;
        rf95->setModemRegisters(mc);

void RF95::SetModemRegisters(byte Reg_1D, byte Reg_1E, Byte Reg26) {
        RH_RF95::ModemConfig mc;
        mc.reg_1d = Reg_1D;
        mc.reg_1e = Reg_1E;
        mc.reg_26 = Reg26;
        rf95->setModemRegisters(&mc);
    }