if (auto&& wrt = Wire.get_writer(...)) { // オブジェクトの生成とデバイスの通信判定
   // このスコープ(波かっこ)内が wrt の有効期間。
   wrt << 0x00; // 0x00 を mwx::stream インタフェースで書き出し
} 
// if 節を抜けるところで wrt は破棄され、バスの利用終了

const uint8_t DEV_ADDR = 0x70;
uint8_t au8data[6];
if (auto&& rdr = Wire.get_reader(DEV_ADDR, 6)) {
		for (auto&& c: au8data) {
			c = rdr();
		}
}

// same above
uint16_t u16temp, u16humd;
uint8_t u8temp_csum, u8humd_csum;
if (auto&& rdr = Wire.get_reader(SHTC3_ADDRESS, 6)) {
		rdr >> u16temp;
		rdr >> u8temp_csum;
		rdr >> u16humd;
		rdr >> u8humd_csum;
}

periphe_wire::reader
get_reader(uint8_t addr, uint8_t read_count = 0)

const uint8_t DEV_ADDR = 0x70;
if (auto&& wrt = Wire.get_writer(DEV_ADDR)) {
	wrt(SHTC3_TRIG_H);
	wrt(SHTC3_TRIG_L);
}

// same above
if (auto&& wrt = Wire.get_writer(DEV_ADDR)) {
	wrt << SHTC3_TRIG_H; // int type is handled as uint8_t
	wrt << SHTC3_TRIG_L;
}

periph_wire::writer
get_writer(uint8_t addr)

operator << (int c)
operator << (uint8_t c)
operator << (uint16_t c) 
operator << (uint32_t c)

operator() (uint8_t val)
operator() (int val)

operator >> (uint8_t& c)
operator >> (uint16_t& c)
operator >> (uint32_t& c)
operator >> (uint8_t(&c)[N]) // Nバイトの固定配列

int operator() (bool b_stop = false)

//例
uint8_t dat[6];
if (auto&& rdr = Wire.get_reader(0x70)) {
  for(uint8_t& x : dat) {
    x = rdr();
  }
}

Wire.begin();
// reset (may not necessary...)
if (auto&& wrt = Wire.get_writer(0x70)) {
	wrt << 0x80; // SHTC3_SOFT_RST_H
	wrt << 0x05; // SHTC3_SOFT_RST_L
}

delay(5); // wait some

// start read
if (auto&& wrt = Wire.get_writer(0x70)) {
	wrt << 0x60; // SHTC3_TRIG_H
	wrt << 0x9C; // SHTC3_TRIG_L
}

delay(10); // wait some

// read result
uint16_t u16temp, u16humd;
uint8_t u8temp_csum, u8humd_csum;
if (auto&& rdr = Wire.get_reader(0x70, 6)) {
	rdr >> u16temp;
	rdr >> u8temp_csum;
	rdr >> u16humd;
	rdr >> u8humd_csum;
}

// checksum 0x31, init=0xFF
if (CRC8_u8CalcU16(u16temp, 0xff) != u8temp_csum) {
	Serial << format("{SHTC3 T CKSUM %x}", u8temp_csum); }
if (CRC8_u8CalcU16(u16humd, 0xff) != u8humd_csum) {
	Serial << format("{SHTC3 H CKSUM %x}", u8humd_csum); }

// calc temp/humid (degC x 100, % x 100)
int16_t i16Temp = (int16_t)(-4500 + ((17500 * int32_t(u16temp)) >> 16));
int16_t i16Humd = (int16_t)((int32_t(u16humd) * 10000) >> 16);

Serial << "temp=" << int(i16Temp) 
	   << ",humid=" << int(i16Humd) << mwx::crlf;

typedef uint8_t size_type;
typedef uint8_t value_type;

void begin(
    const size_type u8mode = WIRE_100KHZ,
    bool b_portalt = false)

void setup() {
    ...
    Wire.begin();
    ...
}

void wakeup() {
    ...
    Wire.begin();
    ...
}

bool probe(uint8_t address)

size_type requestFrom(
    uint8_t u8address,
    size_type length,
    bool b_send_stop = true)

int len = Wire.requestFrom(0x70, 6);
for (int i = 0; i < 6; i++) {
  if (Wire.available()) {
		  au8data[i] = Wire.read();
    Serial.print(buff[i], HEX);
  }
}
// skip the rest (just in case)
// while (Wire.available()) Wire.read(); // normally, not necessary.

	#define DEV_ADDR (0x70)
	const uint8_t msg[2] = 
	  {SHTC3_SOFT_RST_H, SHTC3_SOFT_RST_L};

	Wire.beginTransmission(DEV_ADDR);
	Wire.write(msg, sizeof(msg));
	Wire.endTransmission();

void beginTransmission(uint8_t address)

size_type write(const value_type value)

size_type write(
  const value_type* value,
  size_type quantity)

uint8_t endTransmission(bool sendStop = true)