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xo-interpreter2: + nil + cons

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This commit is contained in:
Roland Conybeare 2026-03-11 16:19:40 -05:00
commit 87f08a4e4d
2 changed files with 24 additions and 4 deletions
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10
include/xo/object2/DList.hpp
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@ -26,11 +26,14 @@ namespace xo {
DList(xo::obj<AGCObject> h,
DList * r) : head_{h}, rest_{r} {}
/** sentinel for null list.
/** sentinel for null list. Idempotent.
* Application code may prefer ListOps::nil()
**/
static DList * _nil();
/** like _nil(), but retrn fop wrapper **/
static obj<AGCObject,DList> nil();
/** list with first element @p car,
* followed by contents of list @p cdr.
* Shares structure with @p cdr
@ -40,6 +43,11 @@ namespace xo {
obj<AGCObject> car,
DList * cdr);
/** like @c _cons(mm,car,cdr), but return fop wrapper **/
static obj<AGCObject,DList> cons(obj<AAllocator> mm,
obj<AGCObject> car,
DList * cdr);
/** DList length is at least 1 **/
bool is_empty() const noexcept;
/** DList models a finite sequence **/