/* ---------------------------------
qset.h
header file for qset.c that implements set
see qh-set.htm and qset.c
only uses mem.c, malloc/free
for error handling, writes message and calls
qh_errexit (qhmem_ERRqhull, NULL, NULL);
set operations satisfy the following properties:
- sets have a max size, the actual size (if different) is stored at the end
- every set is NULL terminated
- sets may be sorted or unsorted, the caller must distinguish this
copyright (c) 1993-2002, The Geometry Center
*/
#ifndef qhDEFset
#define qhDEFset 1
/*================= -structures- ===============*/
#ifndef DEFsetT
#define DEFsetT 1
typedef struct setT setT; /* a set is a sorted or unsorted array of pointers */
#endif
/*------------------------------------------
setT
a set or list of pointers with maximum size and actual size.
variations:
unsorted, unique -- a list of unique pointers with NULL terminator
user guarantees uniqueness
sorted -- a sorted list of unique pointers with NULL terminator
qset.c guarantees uniqueness
unsorted -- a list of pointers terminated with NULL
indexed -- an array of pointers with NULL elements
structure for set of n elements:
--------------
| maxsize
--------------
| e[0] - a pointer, may be NULL for indexed sets
--------------
| e[1]
--------------
| ...
--------------
| e[n-1]
--------------
| e[n] = NULL
--------------
| ...
--------------
| e[maxsize] - n+1 or NULL (determines actual size of set)
--------------
*/
/*-- setelemT -- internal type to allow both pointers and indices
*/
typedef union setelemT setelemT;
union setelemT {
void *p;
int i; /* integer used for e[maxSize] */
};
struct setT {
int maxsize; /* maximum number of elements (except NULL) */
setelemT e[1]; /* array of pointers, tail is NULL */
/* last slot (unless NULL) is actual size+1
e[maxsize]==NULL or e[e[maxsize]-1]==NULL */
/* this may generate a warning since e[] contains
maxsize elements */
};
/*=========== -constants- =========================*/
/*-------------------------------------
SETelemsize
size of a set element in bytes
*/
#define SETelemsize sizeof(setelemT)
/*=========== -macros- =========================*/
/*-------------------------------------
FOREACHsetelement_(type, set, variable)
define FOREACH iterator
declare:
assumes *variable and **variablep are declared
no space in "variable)" [DEC Alpha cc compiler]
each iteration:
variable is set element
variablep is one beyond variable.
to repeat an element:
variablep--; / *repeat* /
at exit:
variable is NULL at end of loop
example:
#define FOREACHfacet_( facets ) FOREACHsetelement_( facetT, facets, facet )
notes:
use FOREACHsetelement_i_() if need index or include NULLs
WARNING:
nested loops can't use the same variable (define another FOREACH)
needs braces if nested inside another FOREACH
this includes intervening blocks, e.g. FOREACH...{ if () FOREACH...} )
*/
#define FOREACHsetelement_(type, set, variable) \
if (((variable= NULL), set)) for(\
variable##p= (type **)&((set)->e[0].p); \
(variable= *variable##p++);)
/*------------------------------------------
FOREACHsetelement_i_(type, set, variable)
define indexed FOREACH iterator
declare:
type *variable, variable_n, variable_i;
each iteration:
variable is set element, may be NULL
variable_i is index, variable_n is qh_setsize()
to repeat an element:
variable_i--; variable_n-- repeats for deleted element
at exit:
variable==NULL and variable_i==variable_n
example:
#define FOREACHfacet_i_( facets ) FOREACHsetelement_i_( facetT, facets, facet )
WARNING:
nested loops can't use the same variable (define another FOREACH)
needs braces if nested inside another FOREACH
this includes intervening blocks, e.g. FOREACH...{ if () FOREACH...} )
*/
#define FOREACHsetelement_i_(type, set, variable) \
if (((variable= NULL), set)) for (\
variable##_i= 0, variable= (type *)((set)->e[0].p), \
variable##_n= qh_setsize(set);\
variable##_i < variable##_n;\
variable= (type *)((set)->e[++variable##_i].p) )
/*----------------------------------------
FOREACHsetelementreverse_(type, set, variable)-
define FOREACH iterator in reverse order
declare:
assumes *variable and **variablep are declared
also declare 'int variabletemp'
each iteration:
variable is set element
to repeat an element:
variabletemp++; / *repeat* /
at exit:
variable is NULL
example:
#define FOREACHvertexreverse_( vertices ) FOREACHsetelementreverse_( vertexT, vertices, vertex )
notes:
use FOREACHsetelementreverse12_() to reverse first two elements
WARNING: needs braces if nested inside another FOREACH
*/
#define FOREACHsetelementreverse_(type, set, variable) \
if (((variable= NULL), set)) for(\
variable##temp= qh_setsize(set)-1, variable= qh_setlast(set);\
variable; variable= \
((--variable##temp >= 0) ? SETelemt_(set, variable##temp, type) : NULL))
/*-------------------------------------
FOREACHsetelementreverse12_(type, set, variable)-
define FOREACH iterator with e[1] and e[0] reversed
declare:
assumes *variable and **variablep are declared
each iteration:
variable is set element
variablep is one after variable.
to repeat an element:
variablep--; / *repeat* /
at exit:
variable is NULL at end of loop
example
#define FOREACHvertexreverse12_( vertices ) FOREACHsetelementreverse12_( vertexT, vertices, vertex )
notes:
WARNING: needs braces if nested inside another FOREACH
*/
#define FOREACHsetelementreverse12_(type, set, variable) \
if (((variable= NULL), set)) for(\
variable##p= (type **)&((set)->e[1].p); \
(variable= *variable##p); \
variable##p == ((type **)&((set)->e[0].p))?variable##p += 2: \
(variable##p == ((type **)&((set)->e[1].p))?variable##p--:variable##p++))
/*-------------------------------------
FOREACHelem_( set )-
iterate elements in a set
declare:
void *elem, *elemp;
each iteration:
elem is set element
elemp is one beyond
to repeat an element:
elemp--; / *repeat* /
at exit:
elem == NULL at end of loop
example:
FOREACHelem_(set) {
notes:
WARNING: needs braces if nested inside another FOREACH
*/
#define FOREACHelem_(set) FOREACHsetelement_(void, set, elem)
/*-------------------------------------
FOREACHset_( set )-
iterate a set of sets
declare:
setT *set, **setp;
each iteration:
set is set element
setp is one beyond
to repeat an element:
setp--; / *repeat* /
at exit:
set == NULL at end of loop
example
FOREACHset_(sets) {
notes:
WARNING: needs braces if nested inside another FOREACH
*/
#define FOREACHset_(sets) FOREACHsetelement_(setT, sets, set)
/*-------------------------------------------
SETindex_( set, elem )
return index of elem in set
notes:
for use with FOREACH iteration
example:
i= SETindex_(ridges, ridge)
*/
#define SETindex_(set, elem) ((void **)elem##p - (void **)&(set)->e[1].p)
/*-----------------------------------------
SETref_( elem )
l.h.s. for modifying the current element in a FOREACH iteration
example:
SETref_(ridge)= anotherridge;
*/
#define SETref_(elem) (elem##p[-1])
/*-----------------------------------------
SETelem_(set, n)
return the n'th element of set
notes:
assumes that n is valid [0..size] and that set is defined
use SETelemt_() for type cast
*/
#define SETelem_(set, n) ((set)->e[n].p)
/*-----------------------------------------
SETelemt_(set, n, type)
return the n'th element of set as a type
notes:
assumes that n is valid [0..size] and that set is defined
*/
#define SETelemt_(set, n, type) ((type*)((set)->e[n].p))
/*-----------------------------------------
SETelemaddr_(set, n, type)
return address of the n'th element of a set
notes:
assumes that n is valid [0..size] and set is defined
*/
#define SETelemaddr_(set, n, type) ((type **)(&((set)->e[n].p)))
/*-----------------------------------------
SETfirst_(set)
return first element of set
*/
#define SETfirst_(set) ((set)->e[0].p)
/*-----------------------------------------
SETfirstt_(set, type)
return first element of set as a type
*/
#define SETfirstt_(set, type) ((type*)((set)->e[0].p))
/*-----------------------------------------
SETsecond_(set)
return second element of set
*/
#define SETsecond_(set) ((set)->e[1].p)
/*-----------------------------------------
SETsecondt_(set, type)
return second element of set as a type
*/
#define SETsecondt_(set, type) ((type*)((set)->e[1].p))
/*-----------------------------------------
SETaddr_(set, type)
return address of set's elements
*/
#define SETaddr_(set,type) ((type **)(&((set)->e[0].p)))
/*-----------------------------------------
SETreturnsize_(set, size)
return size of a set
notes:
set must be defined
use qh_setsize(set) unless speed is critical
*/
#define SETreturnsize_(set, size) (((size)= ((set)->e[(set)->maxsize].i))?(--(size)):((size)= (set)->maxsize))
/*-----------------------------------------
SETempty_(set)
return true (1) if set is empty
notes:
set may be NULL
*/
#define SETempty_(set) (!set || (SETfirst_(set) ? 0:1))
/*-----------------------------------------
SETtruncate_(set)
return first element of set
see:
qh_settruncate()
*/
#define SETtruncate_(set, size) {set->e[set->maxsize].i= size+1; /* maybe overwritten */ \
set->e[size].p= NULL;}
/*======= prototypes in alphabetical order ============*/
void qh_setaddsorted(setT **setp, void *elem);
void qh_setaddnth(setT **setp, int nth, void *newelem);
void qh_setappend(setT **setp, void *elem);
void qh_setappend_set(setT **setp, setT *setA);
void qh_setappend2ndlast(setT **setp, void *elem);
void qh_setcheck(setT *set, char *tname, int id);
void qh_setcompact(setT *set);
setT *qh_setcopy(setT *set, int extra);
void *qh_setdel(setT *set, void *elem);
void *qh_setdellast(setT *set);
void *qh_setdelnth(setT *set, int nth);
void *qh_setdelnthsorted(setT *set, int nth);
void *qh_setdelsorted(setT *set, void *newelem);
setT *qh_setduplicate( setT *set, int elemsize);
int qh_setequal(setT *setA, setT *setB);
int qh_setequal_except (setT *setA, void *skipelemA, setT *setB, void *skipelemB);
int qh_setequal_skip (setT *setA, int skipA, setT *setB, int skipB);
void qh_setfree(setT **set);
void qh_setfree2( setT **setp, int elemsize);
void qh_setfreelong(setT **set);
int qh_setin(setT *set, void *setelem);
int qh_setindex(setT *set, void *setelem);
void qh_setlarger(setT **setp);
void *qh_setlast(setT *set);
setT *qh_setnew(int size);
setT *qh_setnew_delnthsorted(setT *set, int size, int nth, int prepend);
void qh_setprint(FILE *fp, char* string, setT *set);
void qh_setreplace(setT *set, void *oldelem, void *newelem);
int qh_setsize(setT *set);
setT *qh_settemp(int setsize);
void qh_settempfree(setT **set);
void qh_settempfree_all(void);
setT *qh_settemppop(void);
void qh_settemppush(setT *set);
void qh_settruncate (setT *set, int size);
int qh_setunique (setT **set, void *elem);
void qh_setzero (setT *set, int index, int size);
#endif /* qhDEFset */