-ARTICLE: "c-out-params" "Output parameters in C"
-"A frequently-occurring idiom in C code is the \"out parameter\". If a C function returns more than one value, the caller passes pointers of the correct type, and the C function writes its return values to those locations."
-$nl
-"To wrap Factor data for consumption by the FFI, we use a utility word that constructs a byte array of the correct size and converts the Factor object to a C value stored into that byte array:"
-{ $subsections <ref> }
-"You call the out parameter constructor with the required initial value, then pass the byte array to the C function, which receives a pointer to the start of the byte array's data area. The C function then returns, leaving the result in the byte array; you read it back using this word:"
-{ $subsections deref }
-"Note that while structure and union types do not get these words defined for them, there is no loss of generality since " { $link <void*> } " and " { $link *void* } " may be used." ;
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