\ implementation of Forth 200x structures
\ Copyright (C) 2007 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.
: standard+field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
(field) over ,
\ A number of things have field-like structure, but not
\ exactly field-like behavior. Objects, locals, etc.
\ Allow them to plug into +field.
: standard:field ( -- )
\g set +field to standard behavior
['] standard+field IS +field ;
: extend-structure ( n "name" -- struct-sys n ) \ Gforth
\g extend an existing structure
standard:field >r 0 value lastxt >body r> ;
: begin-structure ( "name" -- struct-sys 0 ) \ X:structures
0 extend-structure ;
: end-structure ( struct-sys +n -- ) \ X:structures
swap ! ;
: cfield: ( u1 "name" -- u2 ) \ X:structures
1 +field ;
: field: ( u1 "name" -- u2 ) \ X:structures
aligned cell +field ;
: 2field: ( u1 "name" -- u2 ) \ gforth
aligned 2 cells +field ;
: ffield: ( u1 "name" -- u2 ) \ X:structures
faligned 1 floats +field ;
: sffield: ( u1 "name" -- u2 ) \ X:structures
sfaligned 1 sfloats +field ;
: dffield: ( u1 "name" -- u2 ) \ X:structures
dfaligned 1 dfloats +field ;