template<> int scoreArg<QByteArray>(SEXP arg, const SmokeType &type) {
if (TYPEOF(arg) == STRSXP)
return type.isPtr() ? 1 : 2;
else if (TYPEOF(arg) == RAWSXP)
return type.isPtr() ? 2 : 3;
else return scoreArg_basetype(arg, type);
}
template<> int scoreArg<unsigned char>(SEXP arg, const SmokeType &type) {
int score = 0;
// we consider ptr as array of bytes, and Qt will not copy, but R might free
if (!type.isPtr()) {
switch(TYPEOF(arg)) {
case RAWSXP:
score = 3;
break;
case INTSXP:
case REALSXP:
score = 1;
break;
default:
break;
}
}
return score;
}
template<> int scoreArg<QString>(SEXP arg, const SmokeType &type) {
if (TYPEOF(arg) == STRSXP)
return type.isPtr() ? 1 : 3;
else return 0;
}
/* C++ compilers select overloaded methods by ranking each argument in
terms of its implicit conversions. There are three different types
of implicit conversions: standard, user and ellipsis. We only
consider the former, as the others probably are not relevant for
Qt. Within standard conversions, there are three ranks: exact,
promotion and conversion. We assign these scores 3, 2 and 1,
respectively, while 0 indicates no conversion and -1 indicates an
error (e.g. unsupported type). The method with better or same
ranks for all of its parameters is selected. If there is a tie for
the best method, there is an error (in our code).
*/
int scoreArg_basetype(SEXP arg, const SmokeType &type) {
int score = 0;
SEXP value = arg;
int rtype = TYPEOF(value);
unsigned short elem = type.elem();
switch(rtype) { // try the simple cases first
case RAWSXP:
switch(elem) {
case Smoke::t_uchar:
score = 3;
break;
case Smoke::t_short:
case Smoke::t_ushort:
score = 2;
break;
case Smoke::t_int:
case Smoke::t_uint:
case Smoke::t_long:
case Smoke::t_ulong:
case Smoke::t_float:
case Smoke::t_double:
score = 1;
break;
default:
break;
}
break;
case INTSXP:
switch(elem) {
case Smoke::t_enum:
if (inherits(value, "QtEnum"))
score = 2;
else score = 1;
break;
case Smoke::t_int:
score = 3;
break;
case Smoke::t_uint:
if (inherits(value, "QtEnum")) {
score = 3; // favor QFlags over enums
break;
}
case Smoke::t_long:
case Smoke::t_ulong:
case Smoke::t_float:
case Smoke::t_double:
score = 2;
break;
case Smoke::t_short:
case Smoke::t_ushort:
case Smoke::t_uchar:
score = 1;
break;
default:
break;
}
break;
case REALSXP:
switch(elem) {
case Smoke::t_double:
score = 3;
break;
case Smoke::t_float:
case Smoke::t_uint: // to distinguish int/uint
score = 2;
break;
case Smoke::t_int:
case Smoke::t_long:
case Smoke::t_ulong:
case Smoke::t_short:
case Smoke::t_ushort:
case Smoke::t_uchar:
case Smoke::t_enum:
score = 1;
break;
default:
break;
}
break;
case STRSXP:
if (elem == Smoke::t_char && strlen(CHAR(asChar(value))) == 1)
score = 2;
break;
case ENVSXP:
if (elem == Smoke::t_class) {
SmokeObject *o = SmokeObject::fromSexp(value);
if (o) {
const char *smokeClass = type.className();
if (o->className() == smokeClass)
score = 3;
else if (o->instanceOf(smokeClass))
score = 2;
/* Not clear if we want to support this C++ feature
else {
Method *m = Class::fromSmokeType(type)->findImplicitConverter(o);
if (m) {
score = 1;
delete m;
}
}
*/
}
}
break;
case NILSXP:
if (type.isPtr())
score = 1;
break;
default:
break;
}
return score;
}
