John Maddock wrote:
Example
What in the world is "is_it_what" supposed to convey? The name is nonsensical to me.
Me too, I've removed the example. Frankly I'm not sure if anyone is actually using the integer-masks, compile-time log2 or min/max functions, I don't really see the point, and the examples given don't help much :-(
I've used the compile-time log2 to determine the smallest integer type in which I can store any value of an enumeration. It's not easy to use, though; I'd prefer something that returned ceil(log2(n)) rather than floor(log2(n)). I can't make any sense of the existing example. I've used the bit masks too, though I can't remember what for right now. The point of low_bit_mask_t is to avoid code like this, which doesn't work when n==32 and sizeof(int)==4: uint32_t mask = (1<<n)-1; (As the docs say: "When Bits is the exact size of a built-in unsigned type, the implementation has to change to prevent undefined behaviour."). The high_bit_mask_t is less useful. I don't see a good use for it. I don't think I've ever used min/max, either. John Bytheway