本文整理汇总了C++中IsVarTerm函数的典型用法代码示例。如果您正苦于以下问题：C++ IsVarTerm函数的具体用法？C++ IsVarTerm怎么用？C++ IsVarTerm使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了IsVarTerm函数的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: exists_directory
static Int exists_directory(USES_REGS1) {
Term tname = Deref(ARG1);
char *file_name;
if (IsVarTerm(tname)) {
Yap_Error(INSTANTIATION_ERROR, tname, "exists_directory/1");
return FALSE;
} else if (!IsAtomTerm(tname)) {
Yap_Error(TYPE_ERROR_ATOM, tname, "exists_directory/1");
return FALSE;
} else {
VFS_t *vfs;
char *s = Yap_VF(RepAtom(AtomOfTerm(tname))->StrOfAE);
if (!s) return false;
if ((vfs = vfs_owner(s))) {
bool rc = true;
return vfs->isdir(vfs, s);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return rc;
}
#if HAVE_STAT
struct SYSTEM_STAT ss;
file_name = Yap_VF(RepAtom(AtomOfTerm(tname))->StrOfAE);
if (SYSTEM_STAT(file_name, &ss) != 0) {
/* ignore errors while checking a file */
return false;
}
return (S_ISDIR(ss.st_mode));
#else
return FALSE;
#endif
}
}示例2: p_is
/// @memberof is/2
static Int
p_is( USES_REGS1 )
{ /* X is Y */
Term out;
yap_error_number err;
Term t = Deref(ARG2);
if (IsVarTerm(t)) {
Yap_EvalError(INSTANTIATION_ERROR,t, "X is Y");
return(FALSE);
}
Yap_ClearExs();
do {
out = Yap_InnerEval(Deref(ARG2));
if ((err = Yap_FoundArithError()) == YAP_NO_ERROR)
break;
if (err == RESOURCE_ERROR_STACK) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_gcl(LOCAL_Error_Size, 2, ENV, CP)) {
Yap_EvalError(RESOURCE_ERROR_STACK, ARG2, LOCAL_ErrorMessage);
return FALSE;
}
} else {
Yap_EvalError(err, ARG2, "X is Exp");
return FALSE;
}
} while (TRUE);
return Yap_unify_constant(ARG1,out);
}示例3: p_freeze_choice_point
static Int p_freeze_choice_point( USES_REGS1 ) {
if (IsVarTerm(Deref(ARG1))) {
Int offset = freeze_current_cp();
return Yap_unify(ARG1, MkIntegerTerm(offset));
}
return (FALSE);
}示例4: mark_local
static void
mark_local(void)
{
CELL *pt;
/* Adjusting the local */
pt = LCL0;
/* moving the trail is simple */
while (pt > ASP) {
CELL reg = *--pt;
if (!IsVarTerm(reg)) {
if (IsAtomTerm(reg)
#ifdef TABLING
/* assume we cannot have atoms on first page,
so this must be an arity
*/
&& reg > Yap_page_size
#endif
) {
MarkAtomEntry(RepAtom(AtomOfTerm(reg)));
}
}
}
}示例5: mark_global_cell
static CELL *
mark_global_cell(CELL *pt)
{
CELL reg = *pt;
if (IsVarTerm(reg)) {
/* skip bitmaps */
switch(reg) {
case (CELL)FunctorDouble:
#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
return pt + 4;
#else
return pt + 3;
#endif
case (CELL)FunctorBigInt:
{
Int sz = 3 +
(sizeof(MP_INT)+
(((MP_INT *)(pt+2))->_mp_alloc*sizeof(mp_limb_t)))/sizeof(CELL);
return pt + sz;
}
case (CELL)FunctorLongInt:
return pt + 3;
break;
}
} else if (IsAtomTerm(reg)) {
MarkAtomEntry(RepAtom(AtomOfTerm(reg)));
return pt+1;
}
return pt+1;
}示例6: file_exists
static Int file_exists(USES_REGS1) {
Term tname = Deref(ARG1);
char *file_name;
if (IsVarTerm(tname)) {
Yap_Error(INSTANTIATION_ERROR, tname, "access");
return FALSE;
} else if (!IsAtomTerm(tname)) {
Yap_Error(TYPE_ERROR_ATOM, tname, "access");
return FALSE;
} else {
#if HAVE_STAT
struct SYSTEM_STAT ss;
file_name = RepAtom(AtomOfTerm(tname))->StrOfAE;
if (SYSTEM_STAT(file_name, &ss) != 0) {
if (errno == ENOENT)
return false;
PlIOError(SYSTEM_ERROR_OPERATING_SYSTEM, tname, "error %s",
strerror(errno));
return false;
}
return true;
#else
return FALSE;
#endif
}
}示例7: p_compare
/** @pred compare( _C_, _X_, _Y_) is iso
As a result of comparing _X_ and _Y_, _C_ may take one of
the following values:
+
`=` if _X_ and _Y_ are identical;
+
`<` if _X_ precedes _Y_ in the defined order;
+
`>` if _Y_ precedes _X_ in the defined order;
*/
Int p_compare(USES_REGS1) { /* compare(?Op,?T1,?T2) */
Int r = compare(Deref(ARG2), Deref(ARG3));
Atom p;
Term t = Deref(ARG1);
if (r < 0)
p = AtomLT;
else if (r > 0)
p = AtomGT;
else
p = AtomEQ;
if (!IsVarTerm(t)) {
if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
if (a == p)
return true;
if (a != AtomLT && a != AtomGT && a != AtomEq)
Yap_Error(DOMAIN_ERROR_ORDER, ARG1, NULL);
} else {
Yap_Error(TYPE_ERROR_ATOM, ARG1, NULL);
}
return false;
}
return Yap_unify_constant(ARG1, MkAtomTerm(p));
}示例8: file_directory_name
static Int file_directory_name(USES_REGS1) { /* file_directory_name(Stream,N) */
Term t = Deref(ARG1);
Atom at;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "file_directory_name/2");
return false;
}
at = AtomOfTerm(t);
const char *c = RepAtom(at)->StrOfAE;
#if HAVE_BASENAME && 0 // DISABLED: Linux basename is not compatible with
// file_base_name in SWI and GNU
const char *s;
char c1[YAP_FILENAME_MAX + 1];
strncpy(c1, c, YAP_FILENAME_MAX);
s = dirname(c1);
#else
char s[YAP_FILENAME_MAX + 1];
Int i = strlen(c);
strncpy(s, c, YAP_FILENAME_MAX);
while (--i) {
if (Yap_dir_separator((int)c[i]))
break;
}
if (i == 0) {
s[0] = '.';
i = 1;
}
s[i] = '\0';
#endif
return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
}示例9: qq_open
static Int qq_open(USES_REGS1) {
PRED_LD
Term t = Deref(ARG1);
if (!IsVarTerm(t) && IsApplTerm(t) && FunctorOfTerm(t) =
FunctorDQuasiQuotation) {
void *ptr;
char *start;
size_t l int s;
Term t0, t1, t2;
if (IsPointerTerm((t0 = ArgOfTerm(1, t))) &&
IsPointerTerm((t1 = ArgOfTerm(2, t))) &&
IsIntegerTerm((t2 = ArgOfTerm(3, t)))) {
ptr = PointerOfTerm(t0);
start = PointerOfTerm(t1);
len = IntegerOfTerm(t2);
if ((s = Yap_open_buf_read_stream(start, len, ENC_UTF8, MEM_BUF_USER)) <
0)
return false;
return Yap_unify(ARG2, Yap_MkStream(s));
} else {
Yap_Error(TYPE_ERROR_READ_CONTEXT, t);
}
return FALSE;
}
}示例10: access_path
static Int access_path(USES_REGS1) {
Term tname = Deref(ARG1);
if (IsVarTerm(tname)) {
Yap_Error(INSTANTIATION_ERROR, tname, "access");
return false;
} else if (!IsAtomTerm(tname)) {
Yap_Error(TYPE_ERROR_ATOM, tname, "access");
return false;
} else {
VFS_t *vfs;
char *s = RepAtom(AtomOfTerm(tname))->StrOfAE;
if (!s) return false;
if ((vfs = vfs_owner(s))) {
vfs_stat st;
bool rc = vfs->stat(vfs, s, &st);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return rc;
}
#if HAVE_STAT
struct SYSTEM_STAT ss;
char *file_name;
file_name = RepAtom(AtomOfTerm(tname))->StrOfAE;
if (SYSTEM_STAT(file_name, &ss) != 0) {
/* ignore errors while checking a file */
return true;
}
return true;
#else
return false;
#endif
}
}示例11: file_base_name
static Int file_base_name(USES_REGS1) { /* file_base_name(Stream,N) */
Term t = Deref(ARG1);
Atom at;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "file_base_name/2");
return FALSE;
}
at = AtomOfTerm(t);
const char *c = RepAtom(at)->StrOfAE;
const char *s;
#if HAVE_BASENAME && 0 // DISABLED: Linux basename is not compatible with
// file_base_name in SWI and GNU
char c1[YAP_FILENAME_MAX + 1];
strncpy(c1, c, YAP_FILENAME_MAX);
s = basename(c1);
#else
Int i = strlen(c);
while (i && !Yap_dir_separator((int)c[--i]))
;
if (Yap_dir_separator((int)c[i])) {
i++;
}
s = c + i;
#endif
return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
}示例12: p_cyclic
static Int
p_cyclic( USES_REGS1 )
{
Term t = Deref(ARG1);
if (IsVarTerm(t))
return(FALSE);
return rational_tree(t);
}示例13: p_acyclic
static Int
p_acyclic( USES_REGS1 )
{
Term t = Deref(ARG1);
if (IsVarTerm(t))
return(TRUE);
return !rational_tree(t);
}示例14: file_no
static Int file_no(int sno, Term t2 USES_REGS) {
int f = Yap_GetStreamFd(sno);
Term rc = MkIntTerm(f);
if (!IsVarTerm(t2) && !IsIntTerm(t2)) {
return false;
}
return Yap_unify_constant(t2, rc);
}示例15: stream_flags
static Int stream_flags(USES_REGS1) { /* '$stream_flags'(+N,-Flags) */
Term trm;
trm = Deref(ARG1);
if (IsVarTerm(trm) || !IsIntTerm(trm))
return (FALSE);
return (Yap_unify_constant(ARG2,
MkIntTerm(GLOBAL_Stream[IntOfTerm(trm)].status)));
}