I'm wrapping a C struct in a Ruby C extension but I can't find the differente between Data_Wrap_Struct and TypedData_Wrap_Struct in the docs, what's the difference between the two functions?
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It's described pretty well in the official documentation.
The tl;dr is that Data_Wrap_Struct is deprecated and just lets you set the class and the mark/free functions for the wrapped data. TypedData_Wrap_Struct instead lets you set the class and then takes a pointer to a rb_data_type_struct structure that allows for more advanced options to be set for the wrapping:
- the mark/free functions as before, but also
- an internal label to identify the wrapped type
- a function for calculating memory consumption
- arbitrary data (basically letting you wrap data at a class level)
- additional flags for garbage collection optimization
Check my unofficial documentation for a couple examples of how this is used.
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