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5.22.6 Forth200x Structures

The Forth 2012 standard defines a slightly less convenient form of structures. In general (when using field+, you have to perform the alignment yourself, but there are a number of convenience words (e.g., field: that perform the alignment for you.

A typical usage example is:

  field:                   s-a
  faligned 2 floats +field s-b
constant s-struct

An alternative way of writing this structure is:

begin-structure s-struct
  field:                   s-a
  faligned 2 floats +field s-b
begin-structure       "name" – struct-sys 0         X:structures       “begin-structure”
end-structure       struct-sys +n –         X:structures       “end-structure”
+field       unknown         unknown       “+field”
cfield:       u1 "name" – u2         X:structures       “cfield:”
field:       u1 "name" – u2         X:structures       “field:”
2field:       u1 "name" – u2         gforth       “2field:”
ffield:       u1 "name" – u2         X:structures       “ffield:”
sffield:       u1 "name" – u2         X:structures       “sffield:”
dffield:       u1 "name" – u2         X:structures       “dffield:”