\ implementation of Forth 200x structures \ Copyright (C) 2007,2012 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 over if (field) over , else create dozerofield then + ; Defer +field \ 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 ; standard: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 ;