To get a trial key
fill out the form below
Team License (standard version)
Enterprise License (extended version)
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
GBP
RUB
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
>
V782. It is pointless to compute the di…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V782. It is pointless to compute the distance between the elements of different arrays.

Mar 28 2017

The analyzer detected meaningless code computing the distance between the elements of different arrays.

Consider the following example:

ptrdiff_t offset()
{
  char path[9] = "test.txt";
  char resources[9] = "resr.txt";
  return path - resources;
}

Subtracting the addresses of the two arrays allocated on the stack is pointless and very likely to be an error.

To discuss all the suspicious operations involving pointers to arrays, it is convenient to divide pointers into two imaginary groups:

  • Group 'A' includes non-shifted pointers to stack-allocated arrays as well as arrays allocated using 'new' or 'malloc()'.
  • Group 'B' includes shifted pointers to arrays allocated using 'new' or 'malloc' or pointers that the analyzer has no information about.

Based on this division, we get a table of operations on pointers to arrays evaluation of which makes no sense (Table 1).

V782/image1.png

Table 1 – Meaningless pointer operations.

This diagnostic is classified as:

This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site.
Learn More →
Accept