Why Can't You Access 'this' After 'delete this' in C ?

Pitfalls of Utilizing "this" Post "delete this"

In C , the "delete this" construct poses intriguing implications. While the first three restrictions surrounding its usage seem sensible, the fourth restriction prohibiting any interaction with "this" upon its deletion raises the question: why?

The restriction forbids such actions as examining or comparing its value, casting it, or even printing it. This is because the value of "this" becomes undefined after "delete this" is invoked, rendering any subsequent operations involving it undefined as well.

Although certain compilers may execute sensible actions, there is no guarantee from the C specification. The compiler retains the prerogative to engage in unexpected behaviors, potentially compromising system integrity. Thus, invoking undefined behaviors should always be avoided.

To circumvent this limitation, one can make a copy of the "this" pointer (as an integer) before executing "delete this". This will preserve the original value of "this", enabling subsequent operations without encountering undefined behaviors.

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