21st Century C by Ben Klemens

Author:Ben Klemens [Klemens, Ben]
Language: eng
Format: epub, mobi, pdf
Tags: c, o'reilly
Publisher: O'Reilly Media
Published: 2014-10-12T18:30:00+00:00

#include <stdio.h> int main(){ int *var; int const **constptr = &var; // the line that sets up the failure int const fixed = 20; *constptr = &fixed; // 100% valid *var = 30; printf("x=%i y=%i\n", fixed, *var); }

Figure 8-2. The links among the variables in Example 8-7

We would never allow int *var to point directly at int const fixed. We only managed it via a sleight-of-pointer where var winds up implicitly pointing to fixed without explicitly stating it.

Your Turn: Is it possible to cause a failure of const like this one, but where the disallowed type cast happens over the course of a function call, as per the Iggy Pop detector?

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