Function , array and pointers

Question

I have a situation where a function can only take "int" (can't change this) and I need it in a different situation. let me directly write the code

bool foo(int dev) 
{
         ...
         ...
      return true/false;
}

I need to pass :

mClassPointer->dev()
mClassPointer[index]->dev()
dev() //(function)
and obviously dev //(variable)

mClassPointer is pointer to class. dev() is a member function of a class , return an Integer.

Thank You, Als for editing I am new here no much familiar with the syntax — Select Call
– Select Call, Commented Mar 2, 2012 at 3:24
You do not want to return true/false;. Division by zero is undefined. — James McNellis
– James McNellis, Commented Mar 2, 2012 at 3:24

Alex Z · Accepted Answer · 2012-03-02 03:24:36Z

1

If you have a function that needs to handle different datatypes in different situations (as is vaguely implied in your question), then perhaps you need to look into templates.

answered Mar 2, 2012 at 3:24

Alex Z

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8 Comments

stinky472 Over a year ago

+1 for how to make the function really generic. I don't really know if that's what he meant or if there's some weird restriction that only allows him to accept integers.

Select Call Over a year ago

Please elaborate I have a situation where I can take only "int" value

stinky472 Over a year ago

@SelectCall Could you elaborate as to your question? We're not sure what you want to do or why.

Alex Z Over a year ago

@SelectCall What other types do you want the function to take? Your question isn't clear enough there. Theoretically using a template can allow any type to be used... provided it doesn't break the code the template is used in

Select Call Over a year ago

I have couple of device which I need to support , to validate the device I have been calling function at different places which takes above listed arguments . till now It has only "int" now as I am modifying further requires it to handle all I wanna make function generic

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Community · Accepted Answer · 2017-05-23 12:12:08Z

1

You may be able to do that by changing the argument to a void*.

Be very careful with this and read this thread carefully, espc. the post by Loki Astari:

error: cast from 'void*' to 'int' loses precision

If the function only accepts an int then I don't know if this is possible. Read a discussion in this thread if you are thinking of casting your pointers to int and passing. May not work on certain platforms: Converting a pointer into an integer

edited May 23, 2017 at 12:12

CommunityBot

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answered Mar 2, 2012 at 3:22

Sid

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6 Comments

stinky472 Over a year ago

But he says, 'function can only take "int"'. I'm totally confused about what he's asking.

stinky472 Over a year ago

He wants to be able to pass multiple types to a function that takes an int?

Sid Over a year ago

Hmm, not sure if that is possible without issues. Read this stackoverflow.com/questions/153065/…

Select Call Over a year ago

Oh, that seems issue if it does't then need to care anything else not disturb if I change the type?

Sid Over a year ago

@SelectCall not sure what you mean?

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