Structs can be allocated with new- and boa-like constructor words. Additional words are provided for building structs from C memory and from existing buffers:

<struct> ( class -- struct )

<struct-boa> ( class -- quot: ( ... -- struct ) )

malloc-struct ( class -- struct )

memory>struct ( ptr class -- struct )

Fixed-length array fields require a source buffer with exactly the field's byte length, both in constructors and slot setters. A mismatched buffer throws bad-struct-array-length. Raw alien pointers have no declared length and are copied without this check.

When the contents of a struct will be immediately reset, faster primitive words are available that will create a struct without initializing its contents:

(struct) ( class -- struct )

(malloc-struct) ( class -- struct )

Structs have literal syntax, similar to T{ for tuples:

S{