bind to abstract types for c struct with idris

问题

I can not find how to treat this typedef struct TF_Status TF_Status; as abstract types and bind to that

the c function is TF_Status* TF_NewStatus();

data TF_Status
tfNewStatus : IO TF_Status 
tfNewStatus = foreign FFI_C "TF_NewStatus" (IO TF_Status)

http://docs.idris-lang.org/en/latest/reference/ffi.html

it complains that When checking argument fty to function foreign: Can't find a value of type FTy FFI_C [] (IO TF_Status)

回答1:

TF_Status* TF_NewStatus(); returns a pointer to a TF_Status when called. So you only need

tfNewStatus : IO Ptr 
tfNewStatus = foreign FFI_C "TF_NewStatus" (IO Ptr)

来源：https://stackoverflow.com/questions/51242134/bind-to-abstract-types-for-c-struct-with-idris