[MLton-user] ffi question

[Vesa A Norrman]

Hello, I was thinking to call XOpenDisplay from mlton. I wanted to
write someting like

val XOpenDisplay = _ffi "XOpenDisplay" : string -> pointer

but there is not a pointer type available according to documentation

u ::= bool | char | int | real | string | unit | word | word8

XOpenDisplay returns a pointer to a structure (Display), but applications
always treat this pointer opaque. An application only stores this pointer
and passes is to other functions. What is the best type? Another question:
is there a way (in ffi) to check if a pointer is 0. TIA Vesa
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