On Sunday, 26 January 2014 at 00:04:08 UTC, bearophile wrote:
Do you know how to perform the xor trick (http://en.wikipedia.org/wiki/XOR_swap_algorithm ) on two pointers in D?
You don't; it is undefined behavior and could lead to crashes. Suppose another thread triggers a GC run right after the first xor. Then there may be no valid pointers to *x and the GC frees it, so then after the swap, *y points to something entirely different.
test.d(2): Error: 'x' is not of integral type, it is a int*
You could cast it to size_t, then the compiler will let you do the operation, but casting pointers to and from integers means you take matters of correctness into your own hands.
