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NAME

     Symbol - manipulate Perl symbols and their names



SYNOPSIS
         use Symbol;

         $sym = gensym;
         open($sym, "filename");
         $_ = <$sym>;
         # etc.

         ungensym $sym;      # no effect

         print qualify("x"), "\n";              # "Test::x"
         print qualify("x", "FOO"), "\n"        # "FOO::x"
         print qualify("BAR::x"), "\n";         # "BAR::x"
         print qualify("BAR::x", "FOO"), "\n";  # "BAR::x"
         print qualify("STDOUT", "FOO"), "\n";  # "main::STDOUT" (global)
         print qualify(\*x), "\n";              # returns \*x
         print qualify(\*x, "FOO"), "\n";       # returns \*x

         use strict refs;
         print { qualify_to_ref $fh } "foo!\n";
         $ref = qualify_to_ref $name, $pkg;

         use Symbol qw(delete_package);
         delete_package('Foo::Bar');
         print "deleted\n" unless exists $Foo::{'Bar::'};




DESCRIPTION
     `Symbol::gensym' creates an anonymous glob and returns a
     reference to it.  Such a glob reference can be used as a
     file or directory handle.

     For backward compatibility with older implementations that
     didn't support anonymous globs, `Symbol::ungensym' is also
     provided.  But it doesn't do anything.

     `Symbol::qualify' turns unqualified symbol names into
     qualified variable names (e.g. "myvar" ->
     "MyPackage::myvar").  If it is given a second parameter,
     `qualify' uses it as the default package; otherwise, it uses
     the package of its caller.  Regardless, global variable
     names (e.g. "STDOUT", "ENV", "SIG") are always qualified
     with "main::".

     Qualification applies only to symbol names (strings).
     References are left unchanged under the assumption that they
     are glob references, which are qualified by their nature.


     `Symbol::qualify_to_ref' is just like `Symbol::qualify'
     except that it returns a glob ref rather than a symbol name,
     so you can use the result even if `use strict 'refs'' is in
     effect.

     `Symbol::delete_package' wipes out a whole package
     namespace.  Note this routine is not exported by default--
     you may want to import it explicitly.









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Created 1996-2024 by Maxim Chirkov

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