dcsimg
Login | Register   
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.


Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Beginner
Oct 25, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Passing a unction as an argument

Question:
How do I pass a function as a parameter?

Answer:
First, let's distinguish between a parameter and an argument. The parameter is the type of the object passed. An argument is the actual object passed. The following function takes a parameter of type 'pointer to function that doesn't return a value and takes no arguments:


int func( void (*p)() ) //p is a function ptr
{
}
Now suppose you want to pass the following function as an argument, which has a signature that matches func's parameter:

void f()
{}
All you do is pass its name:

int main()
{
 func(f); //f is converted to a pointer
}
C and C++ automatically convert a function name to a pointer to that function. You should also remember that this technique applies to plain functions, not to member functions of a class.
DevX Pro
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date