Converting a ulong to a byte array and constructing a ulong from it

[Radu]

On Thursday, 24 October 2019 at 13:33:30 UTC, 9898287 wrote:
> What's the function for converting a ulong to a native-endian 
> byte array?
> For example,
>
> auto bytes = 0x1234567890123456u64.to_ne_bytes();
> // should yield
> // [0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56] in 
> big-endian and
> // [0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12] in 
> little-endian systems
>
> Also, what's the function for constructing a ulong from a 
> native-endian byte array?
> For example,
>
> auto value = from_be_bytes!ulong([0x12, 0x34, 0x56, 0x78, 0x90, 
> 0x12, 0x34, 0x56]);
> // value is 0x1234567890123456
>
> Rust equivalent:
> https://doc.rust-lang.org/std/primitive.u64.html#method.to_ne_bytes

https://dlang.org/phobos/std_bitmanip.html#bigEndianToNative
https://dlang.org/phobos/std_bitmanip.html#nativeToLittleEndian