Trying to pass in an enum from another class

Question

I have two classes one the Driver and the other one called FilterOut. In Driver, I have an enum called lights that I passed in correctly into FilterOut as an int. I am having trouble figuring out how to do this as a enum.

The enum in my Driver class

enum lights{yellow, green, red, blue};

This worked for me.

void FilterOut::LightIn(int light)
  {
       switch(light);
  }

What I would like to do.

void FilterOut::LightIn(lights light)
  {
       switch(light);
  }

I tried this and several variations but have had no luck, any ideas? I have also tried to include an enum in FilterOut that is the same as the one in Driver and that has now worked either

Robᵩ · Accepted Answer · 2012-08-14 19:49:07Z

4

If the enum is in the Driver class, then you have to qualify its name:

class FilterOut {
 public:
  void LightIn(Driver::lights light);
};

void FilterOut::LightIn(Driver::lights light)
{
   switch(light);
}

You also have to qualify the look-up scope when calling the function:

FilterOut f;
f.LightIn(Driver::red);

edited Aug 14, 2012 at 19:49

Robᵩ

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answered Aug 14, 2012 at 19:09

juanchopanza

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3 Comments

LiraNuna Over a year ago

Make sure the enum is in a public section as well.

Robᵩ Over a year ago

And when he invokes FilterOut::LightIn(), he'll need to qualify the enumerated constant, also: int main () { ...; fo.LightIn(Driver::yellow); ... }

juanchopanza Over a year ago

@Robᵩ Thanks, added an example.

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