Custom Arduino library not instantiating - c++

Question

I have this code in my main arduino file:
#include <HIH4030.h>
HIH4030 humiditySensor(0);
float humidity;
void setup() {
Serial.begin(9600);
}
void loop() {
delay(1000);
humidity = humiditySensor.sensorRH();
}
This is my HIH4030.h file contents:
#ifndef HIH4030_h
#define HIH4030_h
#include "Arduino.h"
class HIH4030{
public:
HIH4030(int pin);
float ratioHumidity();
float sensorRH();
float trueSensorRH(float temperature);
private:
int _pin;
float sample;
float temperature;
};
#endif
//data sheet https://www.sparkfun.com/datasheets/Sensors/Weather/SEN-09569-HIH-4030-datasheet.pdf
This is my HIH4030.cpp file contents:
#include <HIH4030.h>
HIH4030::HIH4030(int pin)
{
_pin = pin;
}
/*
gives humidity as a ratio of VDD
*/
float HIH4030::ratioHumidity(){
//poll analogue in
return analogRead(_pin);
}
/*
gives humidity as a percentage - numbers taken from datasheet
*/
float HIH4030::sensorRH(){
//poll analogue in
sample = analogRead(_pin)*5; //multiply by 5 as sample is a decimal of Vdd
return (sample-0.958)/0.0307;
}
/*
gives humidity adjusted for temperature (in degrees C) - numbers taken from datasheet
*/
float HIH4030::trueSensorRH(float temperature){
float rh = sensorRH();
temperature = temperature*0.00216;
return rh/(1.0546 - temperature);
}
And when I compile I get this error:
Gathering compilation infomation...
Compiling sketch...
Cleaning...
Creating /Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.cpp.o...
Creating /Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.elf...
/Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.cpp.o: In function `__static_initialization_and_destruction_0':
/Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.cpp:7: undefined reference to `HIH4030::HIH4030(int)'
/Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.cpp.o: In function `loop':
/Users/user/Documents/Arduino_Build/QuantifiedGarden/QuantifiedGarden.cpp:23: undefined reference to `HIH4030::sensorRH()'
[Stino - Error while compiling.]
I'm new to arduino, I'm using Stino Sublime Text 2 plugin. I have already converted a more complicated temperature sensor library I had written for a different platform in to Arduino and it worked perfectly - I can't see any difference between this and that other library but I must be missing something.
From what I can tell I have followed the How to make a custom class Arduino tutorial to the letter...

Answer 1

Turns out it was some kind of cache error - deleting the Arduino Build folder sorted it out