SV Manipulation Functions

Returns a boolean indicating whether the SV is derived from the specified class at the C level. To check derivation at the Perl level, call isa() as a normal Perl method.

Currently, the only significant value for flags is SVf_UTF8.

Exactly like "sv_derived_from_pvn", but takes the name string in the form of an SV instead of a string/length pair.

Exactly like "sv_derived_from_pv", but doesn't take a flags parameter.

Exactly like "sv_derived_from_pvn", but takes a nul-terminated string instead of a string/length pair.

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.

Like "sv_does_pv", but doesn't take a flags parameter.

Like "sv_does_sv", but takes a nul-terminated string instead of an SV.

Like "sv_does_sv", but takes a string/length pair instead of an SV.

A specialised variant of croak() for emitting the usage message for xsubs

    croak_xs_usage(cv, "eee_yow");

works out the package name and subroutine name from cv, and then calls croak(). Hence if cv is &ouch::awk, it would call croak as:

    Perl_croak(aTHX_ "Usage: %"SVf"::%"SVf"(%s)", "ouch" "awk", "eee_yow");