Specifying default parameters C++

Question

I have written the following class

class worker
{
   int action;
   int doJob(int type,int time = 0);
   public:
   int call();
}

And the function doJob is like

int worker::doJob(int type,int time = 0)
{
          ....code here
}

When i compile ,i am getting the following error

 error: the default argument for parameter 1 of 'int worker::doJob(int, int)' has not yet been parsed

Surely it is a problem with default parameter specification..So what is the problem with th e prototype?

josephthomas · Accepted Answer · 2012-04-14 06:13:28Z

5

You don't need to redefine the default value

int worker::doJob(int type,int time = 0)

can just be

int worker::doJob(int type,int time)

As you do not need to define the argument more than once.

answered Apr 14, 2012 at 6:13

josephthomas

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1 Comment

Shep Over a year ago

I take issue with "you don't need" and "can just be" above. You can't redefine the default value, and the first line must be changed to second line.

Basile Starynkevitch · Accepted Answer · 2012-04-14 06:13:50Z

4

Put the default in the declaration (ie inside class worker in your example), but not in the definition, e.g. code simply:

 int worker::doJob(int type,int time)
 {  /* your code here */ }

answered Apr 14, 2012 at 6:13

Basile Starynkevitch

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Comments

Shep · Accepted Answer · 2012-04-14 06:15:12Z

1

int worker::doJob(int type,int time = 0) is giving you an error, you should only declare your default argument once.

answered Apr 14, 2012 at 6:15

Shep

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