Struct classes
Factor handbook ยป C library interface

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The classes.struct vocabulary implements struct classes. They are similar to tuple classes, but their slots exhibit value semantics, and they are backed by a contiguous structured block of memory. Structs can be used for space-efficient storage of data in the Factor heap, as well as for passing data to and from C libraries using the C library interface.
Struct class examples
Defining struct classes
Creating instances of structs
Passing structs to C functions