“C is quirky, flawed, and an enormous success”

Re:“C is quirky, flawed, and an enormous success” – Dennis R... by binjooou on Sunday July 09, 2023 @10:03AM (#36654510)

Casting an integer to a pointer is implementation defined, not UB.

And every sane implementation does what everyone expects because its how memory mapped IO works (but you probably want a volatile in there and maybe a compiler or memory barrier as well depending on what the hardware guarantees about the access patterns for that particular range of addresses)

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Re:“C is quirky, flawed, and an enormous success” – Dennis R... by adwn on Sunday July 09, 2023 @02:22PM (#36657325)

> Casting an integer to a pointer is implementation defined, not UB.

You're right, that was a bad example. Here's a better one:

    int x, y;
    ptrdiff_t diff = &x - &y;

This is Undefined Behavior, because &x and &y don't point to the same object.

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