StepperMotor.h: 'ISO C++ forbids initialization of member '_mode'' (and others)

[leggler]

Hey Laurens!

I found your peace of code from the comments of http://www.instructables.com/id/BYJ48-Stepper-Motor/ . The code described there workes fine with me, but I agree that the object orientet options seems smarter, so thanks for the work! However, I cant get it running. When trying the example provided in the StepperMotor library, I get the following error. I checked if it was an import-issue (files in the wrong folder, etc.) but this does not seem to be the case...

Thanks! Lukas

Arduino: 1.0.6 (Mac OS X), Board: "Arduino Uno"
In file included from Example.ino:44:
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:74: error: ISO C++ forbids initialization of member '_mode'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:74: error: making '_mode' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:74: error: ISO C++ forbids in-class initialization of non-const static member '_mode'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:75: error: ISO C++ forbids initialization of member '_steps'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:75: error: making '_steps' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:75: error: ISO C++ forbids in-class initialization of non-const static member '_steps'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:76: error: ISO C++ forbids initialization of member '_delayMs'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:76: error: making '_delayMs' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:76: error: ISO C++ forbids in-class initialization of non-const static member '_delayMs'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:77: error: ISO C++ forbids initialization of member '_engineStep'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:77: error: making '_engineStep' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:77: error: ISO C++ forbids in-class initialization of non-const static member '_engineStep'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:78: error: ISO C++ forbids initialization of member '_currentStep'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:78: error: making '_currentStep' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:78: error: ISO C++ forbids in-class initialization of non-const static member '_currentStep'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:79: error: ISO C++ forbids initialization of member '_rotationDirection'
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:79: error: making '_rotationDirection' static
/Users/lks/Documents/Arduino/libraries/StepperMotor/StepperMotor.h:79: error: ISO C++ forbids in-class initialization of non-const static member '_rotationDirection'

[LaurensHuizer]

Hi Lukas,

This is very strange... it seems like the Mac software version cannot handle the direct initialization of the variables.
Can you try the following:

Change StepperMotor.h and remove the values from the variables (you can copy & paste this):
int _mode;
int _steps;
int _delayMs;
int _engineStep;
int _currentStep;
int _rotationDirection

Next change StepperMotor.cpp and add the initial values to the constructor (you can copy & paste this):
StepperMotor::StepperMotor(int pinA, int pinB, int pinC, int pinD)
: BaseTimedElement()
{
_pinA = pinA;
_pinB = pinB;
_pinC = pinC;
_pinD = pinD;
pinMode(pinA, OUTPUT);
pinMode(pinB, OUTPUT);
pinMode(pinC, OUTPUT);
pinMode(pinD, OUTPUT);
setWaitTimeEvery(_delayMs);
_mode = 0;
_steps = -1;
_delayMs = 1;
_engineStep = 0;
_currentStep = 0;
_rotationDirection = 0;
}

[leggler]

Hey Laurens!

Thanks for your quick answer! It seems like this really is a mac/windows problem!

With the suggested code-changes it works perfectly (Note however that a semicolon is missing in the last line of StepperMotor.h changes, the last line should be "int _rotationDirection;" )

Thanks for the good work!