dcsimg
Login | Register   
LinkedIn
Google+
Twitter
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
Language: C++
Expertise: All
Feb 22, 2000

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Converting a Datatype to a Stream of Bytes

Sometimes you need to convert a certain datatype to its binary stream of bytes. An easy way to do it is to create a union that has two members: the datatype in question and an array of characters with a matching size. For example, to examine the binary representation of a pointer to a member function, the following program assigns the address of the member function f() to the union member p and then it examines the corresponding character array bin_ptr:

 
  class A 
  {
   public:
    void f();
  };

  typedef void (A::*pmf)(); // pointer to member 
  union U
  {
    pmf p;
    unsigned char bin_ptr[sizeof(pmf)];
  };
  int main()
  {
    U u = {0}; // initialize 
    u.p = &A::f; // assign member function's address
  
    for (int j = 0; j< sizeof (U); j++)
      cout<< (int)u.bin_ptr[j]<<" "; // display each byte in p
  }
Danny Kalev
 
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