You could create a reference, then destroy it. 

SV * rv = SvRV_noinc(sv);
int blessed = sv_isobject(rv);
SvREFCNT_dec(rv);

[download]

or you could use the equivalent 

int blessed = SvOBJECT(sv);

[download]

I don't know if that's kosher, but I don't see it breaking.

In reply to Re^5: SV creation inside XS by ikegami
in thread SV creation inside XS by llancet

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