Bitmap.window

ulong window(size_t start, size_t n) const @safe pure nothrow

The packed window word of n visible bits starting at start, LSB-first; the bits past n in the result are cleared. The empty sentinel reads as all-ones, its meaning for validity bitmaps ("no nulls").

Parameters

`start`	the first visible bit of the window
`n`	the number of bits of the window (`0 .. 64`)

Returns

the packed window word.