[MLIR] replace C++ function type defintion in the C API's Interfaces.h

[fuzzypixelz]

Summary

Clearly this something of a typo, and it obviously doesn't even compile.

[fuzzypixelz]

Apparently, it's a result of running clang-tidy in https://reviews.llvm.org/rG2071e7204dda669013113f5b78257dea81ec57af.
I'm not sure if this is a clang-tidy configuration problem or simply an error on behalf of the submitter.

[ftynse]

Obviously it does compile if you use a C++ compiler :)

[jpienaar]

We should ping Mehdi on that one, perhaps this dir needs to be excluded in the automatic tool he has planned.

mlir/include/mlir-c/Interfaces.h

 
 /// Returns the interface TypeID of the InferTypeOpInterface.
 MLIR_CAPI_EXPORTED MlirTypeID mlirInferTypeOpInterfaceTypeID();
 
 /// These callbacks are used to return multiple types from functions while
 /// transferring ownership to the caller. The first argument is the number of
 /// consecutive elements pointed to by the second argument. The third argument
 /// is an opaque pointer forwarded to the callback by the caller.
-using MlirTypesCallback = void (*)(intptr_t, MlirType *, void *);
+typedef void (*MlirTypesCallback)(intptr_t, MlirType *, void *);
 
 /// Infers the return types of the operation identified by its canonical given
 /// the arguments that will be supplied to its generic builder. Calls `callback`
 /// with the types of inferred arguments, potentially several times, on success.
 /// Returns failure otherwise.
 MLIR_CAPI_EXPORTED MlirLogicalResult mlirInferTypeOpInterfaceInferReturnTypes(
     MlirStringRef opName, MlirContext context, MlirLocation location,
     intptr_t nOperands, MlirValue *operands, MlirAttribute attributes,
     intptr_t nRegions, MlirRegion *regions, MlirTypesCallback callback,
     void *userData);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // MLIR_C_INTERFACES_H