AP_Baro: make get_temperature() a const function

libraries/AP_Baro/AP_Baro.h

@@ -35,7 +35,7 @@ public:
     virtual float           get_pressure() = 0;
 
     // temperature in degrees C
-    virtual float           get_temperature() = 0;
+    virtual float           get_temperature() const = 0;
 
     // accumulate a reading - overridden in some drivers
     virtual void            accumulate(void) {}

libraries/AP_Baro/AP_Baro_BMP085.cpp

@@ -181,7 +181,7 @@ float AP_Baro_BMP085::get_pressure() {
     return Press;
 }
 
-float AP_Baro_BMP085::get_temperature() {
+float AP_Baro_BMP085::get_temperature() const {
     return Temp;
 }
 

libraries/AP_Baro/AP_Baro_BMP085.h

@@ -34,7 +34,7 @@ public:
     uint8_t         read();
     void 			accumulate(void);
     float           get_pressure();
-    float           get_temperature();
+    float           get_temperature() const;
 
 private:
     int32_t         RawPress;

libraries/AP_Baro/AP_Baro_HIL.cpp

@@ -94,6 +94,6 @@ float AP_Baro_HIL::get_pressure() {
     return Press;
 }
 
-float AP_Baro_HIL::get_temperature() {
+float AP_Baro_HIL::get_temperature() const {
     return Temp;
 }

libraries/AP_Baro/AP_Baro_HIL.h

@@ -18,7 +18,7 @@ public:
     bool init();
     uint8_t read();
     float get_pressure();
-    float get_temperature();
+    float get_temperature() const;
     void setHIL(float altitude_msl);
     void setHIL(float pressure, float temperature);
 };

libraries/AP_Baro/AP_Baro_MS5611.cpp

@@ -486,7 +486,7 @@ float AP_Baro_MS5611::get_pressure()
     return Press;
 }
 
-float AP_Baro_MS5611::get_temperature()
+float AP_Baro_MS5611::get_temperature() const
 {
     // temperature in degrees C units
     return Temp;

libraries/AP_Baro/AP_Baro_MS5611.h

@@ -86,7 +86,7 @@ public:
     bool            init();
     uint8_t         read();
     float           get_pressure(); // in mbar*100 units
-    float           get_temperature(); // in celsius degrees
+    float           get_temperature() const; // in celsius degrees
 
 
     /* Serial port drivers to pass to "init". */

libraries/AP_Baro/AP_Baro_PX4.cpp

@@ -79,7 +79,7 @@ float AP_Baro_PX4::get_pressure() {
     return _pressure;
 }
 
-float AP_Baro_PX4::get_temperature() {
+float AP_Baro_PX4::get_temperature() const {
     return _temperature;
 }
 

libraries/AP_Baro/AP_Baro_PX4.h

@@ -11,7 +11,7 @@ public:
     bool init();
     uint8_t read();
     float get_pressure();
-    float get_temperature();
+    float get_temperature() const;
 
 private:
     float _temperature;

libraries/AP_Baro/AP_Baro_VRBRAIN.cpp

@@ -79,7 +79,7 @@ float AP_Baro_VRBRAIN::get_pressure() {
     return _pressure;
 }
 
-float AP_Baro_VRBRAIN::get_temperature() {
+float AP_Baro_VRBRAIN::get_temperature() const {
     return _temperature;
 }
 

libraries/AP_Baro/AP_Baro_VRBRAIN.h

@@ -11,7 +11,7 @@ public:
     bool init();
     uint8_t read();
     float get_pressure();
-    float get_temperature();
+    float get_temperature() const;
 
 private:
     float _temperature;