cocoa touch - CMutablePointer<NSRange> dead end -

i'm trying call linefragmentrectforglyphatindex method of nslayoutmanager object in swift. description that:

func linefragmentrectforglyphatindex(glyphindex: int, effectiverange: cmutablepointer<nsrange>)

but can't figure out how suppose call it. according apple docs have call this:

let somerange : nsrange = ... layoutmanager.linefragmentrectforglyphatindex(0, effectiverange: &somerange)

that's documentation says. error: 'nsrange' not subtype of '@lvalue $t5'

what should do?

try making var instead of let:

var somerange: nsrange = ... layoutmanager.linefragmentrectforglyphatindex(0, effectiverange: &somerange)

basically: using & on var gives compatible cmutablepointer, let not supposed mutable. hence type error.

if want pass null pointer, write nil instead of &somerange (and of course don't need declare var).

My