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#ref EXPR

#ref

Returns a non-empty string if EXPR is a reference, the empty string otherwise. If EXPR is not specified,$_ will be used. The value returned depends on the type of thing the reference is a reference to. Builtin types include:

SCALARARRAYHASHCODEREFGLOBLVALUEFORMATIOVSTRINGRegexp

If the referenced object has been blessed into a package, then that package name is returned instead. You can think ofref as atypeof operator.

if (ref($r) eq "HASH") {    print "r is a reference to a hash.\n";}unless (ref($r)) {    print "r is not a reference at all.\n";}

The return valueLVALUE indicates a reference to an lvalue that is not a variable. You get this from taking the reference of function calls likepos() orsubstr().VSTRING is returned if the reference points to aversion string.

The resultRegexp indicates that the argument is a regular expression resulting fromqr//.

See alsoperlref.

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