\ $Id: struct.fs,v 1.6 1995/09/06 21:00:30 pazsan Exp $
\ Usage example:
\
\ struct
\ 1 cells: field search-method
\ 1 cells: field reveal-method
\ end-struct wordlist-map
\
\ The structure can then be extended in the following way
\ wordlist-map
\ 1 cells: field enum-method
\ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method
: nalign ( addr1 n -- addr2 )
\ addr2 is the aligned version of addr1 wrt the alignment size n
1- tuck + swap invert and ;
: field ( offset1 align1 size align -- offset2 align2 )
\ note: this version uses local variables
Header reveal -7 ( [ :dostruc ] Literal ) cfa,
>r rot r@ nalign dup , ( align1 size offset )
+ swap r> nalign ;
: end-struct ( size align -- )
2constant ;
0 1 chars end-struct struct
\ : field ( offset1 align1 size align -- offset2 align2 )
\ create-field
\ does> ( addr1 -- addr2 )
\ @ + ;
\ I don't really like the "type:" syntax. Any other ideas? - anton
\ Also, this seems to be somewhat general. It probably belongs to some
\ other place
: cells: ( n -- size align )
cells cell ;
: doubles: ( n -- size align )
2* cells cell ;
: chars: ( n -- size align )
chars 1 chars ;
: floats: ( n -- size align )
floats 1 floats ;
: dfloats: ( n -- size align )
dfloats 1 dfloats ;
: sfloats: ( n -- size align )
sfloats 1 sfloats ;
: struct-align ( size align -- )
dp @ swap nalign dp !
drop ;
: struct-allot ( size align -- addr )
over swap struct-align
here swap allot ;
: struct-allocate ( size align -- addr ior )
drop allocate ;
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