[Maro]

I haven't written C in a while, but I think this is pretty stupid. sizeof() is a compile-time thing in C, so it's substituted with a number by the time you get an executable. See:

http://stackoverflow.com/questions/671790/how-does-sizeofarr...

I think this is effectively doing the same thing, but in a non-standard way; ie. I think `int n = (&arr)[1] - arr;` is substituted with the actual the number by the compiler the same way sizeof() would be, only noone will know wtf is going on.

Disclaimer: I didn't look at the generated code to confirm; I guess it could even be compiler/runtime dependent.

[dllthomas]

I don't think anyone is proposing that people use this. I read it as an exercise to stretch our understanding of other bits of the language.