util.d

/* Return the number of running processes of the system */
ulong getProcNum() 
{
	version(linux) 
	{
		import std.file, std.algorithm, std.ascii;
		return "/proc".dirEntries(SpanMode.shallow).count!(a => a.name.baseName.all!isDigit);
	}
}

/* Determine the closest element in _arr_ to _n_ */
Number closest
	(Number)
	(in Number[] arr, Number n)
	@safe pure @nogc nothrow
{
	import std.math: abs;
	size_t h = arr.length / 2;
	return h ? n.closest(abs(n-arr[h-1]) < abs(n-arr[h]) ? arr[0..h] : arr[h..$]) : arr[0];
}