*/
STATIC bool
-S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
+S_isa_lookup(pTHX_ HV *stash, const char *name, const HV* const name_stash,
int len, int level)
{
dVAR;
/* A stash/class can go by many names (ie. User == main::User), so
we compare the stash itself just in case */
- if (name_stash && (stash == name_stash))
+ if (name_stash && ((const HV *)stash == name_stash))
return TRUE;
hvname = HvNAME_get(stash);
&& (hv = GvHV(gv)))
{
if (SvIV(subgen) == (IV)PL_sub_generation) {
- SV* sv;
SV** const svp = (SV**)hv_fetch(hv, name, len, FALSE);
- if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
- DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
- name, hvname) );
+ if (svp) {
+ SV * const sv = *svp;
+ if (sv != &PL_sv_undef)
+ DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
+ name, hvname) );
return (sv == &PL_sv_yes);
}
}
}
+/*
+=for apidoc sv_does
+
+Returns a boolean indicating whether the SV performs a specific, named role.
+The SV can be a Perl object or the name of a Perl class.
+
+=cut
+*/
+
#include "XSUB.h"
+bool
+Perl_sv_does(pTHX_ SV *sv, const char *name)
+{
+ const char *classname;
+ bool does_it;
+
+ dSP;
+ ENTER;
+ SAVETMPS;
+
+ SvGETMAGIC(sv);
+
+ if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
+ || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
+ return FALSE;
+
+ if (sv_isobject(sv)) {
+ classname = sv_reftype(SvRV(sv),TRUE);
+ } else {
+ classname = SvPV(sv,PL_na);
+ }
+
+ if (strEQ(name,classname))
+ return TRUE;
+
+ PUSHMARK(SP);
+ XPUSHs(sv);
+ XPUSHs(sv_2mortal(newSVpv(name, 0)));
+ PUTBACK;
+
+ call_method("isa", G_SCALAR);
+ SPAGAIN;
+
+ does_it = SvTRUE( TOPs );
+ FREETMPS;
+ LEAVE;
+
+ return does_it;
+}
+
PERL_XS_EXPORT_C void XS_UNIVERSAL_isa(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_UNIVERSAL_can(pTHX_ CV *cv);
+PERL_XS_EXPORT_C void XS_UNIVERSAL_DOES(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
XS(XS_version_new);
XS(XS_version_stringify);
newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
+ newXS("UNIVERSAL::DOES", XS_UNIVERSAL_DOES, file);
newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
{
/* register the overloading (type 'A') magic */
XSRETURN(1);
}
+XS(XS_UNIVERSAL_DOES)
+{
+ dVAR;
+ dXSARGS;
+
+ if (items != 2)
+ Perl_croak(aTHX_ "Usage: invocant->does(kind)");
+ else {
+ SV * const sv = ST(0);
+ const char *name;
+
+ name = SvPV_nolen_const(ST(1));
+ if (sv_does( sv, name ))
+ XSRETURN_YES;
+
+ XSRETURN_NO;
+ }
+}
+
XS(XS_UNIVERSAL_VERSION)
{
dVAR;
? HvNAME(SvSTASH(SvRV(ST(0))))
: (char *)SvPV_nolen(ST(0));
- if ( items == 1 ) {
- /* no parameter provided */
- if ( sv_isobject(ST(0)) ) {
- /* copy existing object */
- vs = ST(0);
- }
- else {
- /* create empty object */
- vs = sv_newmortal();
- sv_setpvn(vs,"",0);
- }
+ if ( items == 1 || vs == &PL_sv_undef ) { /* no param or explicit undef */
+ /* create empty object */
+ vs = sv_newmortal();
+ sv_setpvn(vs,"",0);
}
else if ( items == 3 ) {
vs = sv_newmortal();