[Qt-creator] Proposal: Adding std::(experimental::)optional

[Christian Kandeler]

On 08/26/2016 04:49 PM, charleyb123 . wrote:
> An aside:  We are currently steeped in the tradition that "zero" is not
> a legal address, but that is (quickly) becoming not-true for
> process-containers, system-emulators and VMs, and new hardware
> (including new CPUs). 

That has nothing to do with the null pointer in C(++). It never refers
to a valid address, that's how the language is defined. If zero is a
valid address in some environment, then it's the compiler's job to
ensure that the null pointer maps to something else at runtime.
That is also the reason that the following code is wrong:
    struct s { void *p; } s;
    memset(&s, 0, sizeof s); // s.p might not be a null pointer at runtime


Christian