compat: c++ alternative to the UNUSED / void-cast macro

code/espurna/compat.h

@@ -111,5 +111,3 @@ namespace std {
 
 #endif
 
-#define UNUSED(x) (void)(x)
-

code/espurna/sensors/ECH1560Sensor.h

@@ -123,10 +123,7 @@ class ECH1560Sensor : public BaseEmonSensor {
             return 0;
         }
 
-        void ICACHE_RAM_ATTR handleInterrupt(unsigned char gpio) {
-
-            UNUSED(gpio);
-
+        void ICACHE_RAM_ATTR handleInterrupt(unsigned char) {
             // if we are trying to find the sync-time (CLK goes high for 1-2ms)
             if (_dosync == false) {
 

code/espurna/sensors/EmonADC121Sensor.h

@@ -143,8 +143,7 @@ class EmonADC121Sensor : public EmonSensor {
             i2c_write_uint8(_address, ADC121_REG_CONFIG, 0);
         }
 
-        unsigned int readADC(unsigned char channel) {
-            UNUSED(channel);
+        unsigned int readADC(unsigned char) {
             unsigned int value = i2c_read_uint16(_address, ADC121_REG_RESULT) & 0x0FFF;
             return value;
         }

code/espurna/sensors/EmonADS1X15Sensor.h

@@ -336,8 +336,7 @@ class EmonADS1X15Sensor : public EmonSensor {
 
         }
 
-        unsigned int readADC(unsigned char channel) {
-            UNUSED(channel);
+        unsigned int readADC(unsigned char) {
             unsigned int value = i2c_read_uint16(_address, ADS1X15_REG_POINTER_CONVERT);
             if (_type == ADS1X15_CHIP_ADS1015) value >>= ADS1015_BIT_SHIFT;
             delayMicroseconds(500);

code/espurna/sensors/EmonAnalogSensor.h

@@ -117,8 +117,7 @@ class EmonAnalogSensor : public EmonSensor {
 
     protected:
 
-        unsigned int readADC(unsigned char channel) {
-            UNUSED(channel);
+        unsigned int readADC(unsigned char) {
             return analogRead(0);
         }
 

code/espurna/sensors/EventSensor.h

@@ -138,8 +138,6 @@ class EventSensor : public BaseSensor {
 
         // Handle interrupt calls from isr[GPIO] functions
         void ICACHE_RAM_ATTR handleInterrupt(unsigned char gpio) {
-            UNUSED(gpio);
-
             // clock count in 32bit value, overflowing:
             // ~53s when F_CPU is 80MHz
             // ~26s when F_CPU is 160MHz

code/espurna/sensors/GeigerSensor.h

@@ -169,8 +169,7 @@ double value(unsigned char index) {
 
 
 // Handle interrupt calls
-void handleInterrupt(unsigned char gpio) {
-        UNUSED(gpio);
+void handleInterrupt(unsigned char) {
         static unsigned long last = 0;
         if (millis() - last > _debounce) {
                 _events = _events + 1;