Scalar::Util

Native Rust implementation built into the interpreter. Runtime: P5. See original documentation for the full Perl reference.

Functions

blessed

returns package name if blessed reference, undef otherwise.

dualvar

create a dual-valued SV with both numeric and string values.

Creates an SV with IOK|POK (or NOK|POK) flags set.

isbool

check if SV is a boolean (PL_sv_yes or PL_sv_no).

isdual

check if scalar is a dualvar. Always returns false.

isvstring

check if scalar was created as a v-string. Always returns false.

isweak

stub, always returns false.

looks_like_number

check if SV looks like a number.

openhandle

check if FH is an open filehandle.

Returns the handle if open, undef otherwise. Recognizes STDIN (fd 0), STDOUT (fd 1), STDERR (fd 2) as always open.

preamble

readonly

check SVf_READONLY flag.

pperl does not currently use a readonly flag, so always returns false.

refaddr

returns numeric address of the referent.

reftype

returns ref type string (SCALAR, ARRAY, HASH, CODE, etc.)

without regard to blessing. Returns undef for non-references.

set_prototype

set CV prototype string.

Stub implementation — prototype setting not yet wired into p5 CVs.

tainted

always returns false (no taint mode in pperl).

unweaken

stub.

weaken

stub. Weak references not fully implemented in p5 runtime.