On Friday, 21 July 2017 at 18:49:21 UTC, Cecil Ward wrote:
I was think about how to create a new type that holds packed
bcd values, of a choice of widths, that must fit into a
uint32_t or a uint64_t (not really long multi-byte objects). I
am not at all sure how to do it. I thought about using a
templated struct to simply wrap a uint of a chosen width, and
perhaps use alias this to make things nicer.
That's usually how this is done. Take a look at the new
std.experimental.checkedint for inspiration [1].
Here's a shell to start with (fill in:
---
struct BCDInteger(ubyte bitWidth) if (bitWidth <= 128)
{
private:
enum byteWidth = // Add bit to byte width conversion (or just
take byte width as template parameter)
ubyte[byteWidth] store;
public:
// Add constructor(s)/static factory functions
// Overload operators,
// Add conversions to other integer formats
// Add alias this for conversion to two complements format
}
---
[1]
https://github.com/dlang/phobos/blob/v2.075.0/std/experimental/checkedint.d#L213
