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.\" ========================================================================
.\"
.IX Title "Symbol 3"
.TH Symbol 3 "2002-11-24" "perl v5.8.0" "Perl Programmers Reference Guide"
.SH "NAME"
Symbol \- manipulate Perl symbols and their names
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Symbol;
.Ve
.PP
.Vb 4
\& $sym = gensym;
\& open($sym, "filename");
\& $_ = <$sym>;
\& # etc.
.Ve
.PP
.Vb 1
\& ungensym $sym; # no effect
.Ve
.PP
.Vb 2
\& # replace *FOO{IO} handle but not $FOO, %FOO, etc.
\& *FOO = geniosym;
.Ve
.PP
.Vb 7
\& print qualify("x"), "\en"; # "Test::x"
\& print qualify("x", "FOO"), "\en" # "FOO::x"
\& print qualify("BAR::x"), "\en"; # "BAR::x"
\& print qualify("BAR::x", "FOO"), "\en"; # "BAR::x"
\& print qualify("STDOUT", "FOO"), "\en"; # "main::STDOUT" (global)
\& print qualify(\e*x), "\en"; # returns \e*x
\& print qualify(\e*x, "FOO"), "\en"; # returns \e*x
.Ve
.PP
.Vb 3
\& use strict refs;
\& print { qualify_to_ref $fh } "foo!\en";
\& $ref = qualify_to_ref $name, $pkg;
.Ve
.PP
.Vb 3
\& use Symbol qw(delete_package);
\& delete_package('Foo::Bar');
\& print "deleted\en" unless exists $Foo::{'Bar::'};
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Symbol::gensym\*(C'\fR creates an anonymous glob and returns a reference
to it. Such a glob reference can be used as a file or directory
handle.
.PP
For backward compatibility with older implementations that didn't
support anonymous globs, \f(CW\*(C`Symbol::ungensym\*(C'\fR is also provided.
But it doesn't do anything.
.PP
\&\f(CW\*(C`Symbol::geniosym\*(C'\fR creates an anonymous \s-1IO\s0 handle. This can be
assigned into an existing glob without affecting the non-IO portions
of the glob.
.PP
\&\f(CW\*(C`Symbol::qualify\*(C'\fR turns unqualified symbol names into qualified
variable names (e.g. \*(L"myvar\*(R" \-> \*(L"MyPackage::myvar\*(R"). If it is given a
second parameter, \f(CW\*(C`qualify\*(C'\fR uses it as the default package;
otherwise, it uses the package of its caller. Regardless, global
variable names (e.g. \*(L"\s-1STDOUT\s0\*(R", \*(L"\s-1ENV\s0\*(R", \*(L"\s-1SIG\s0\*(R") are always qualified with
\&\*(L"main::\*(R".
.PP
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.
.PP
\&\f(CW\*(C`Symbol::qualify_to_ref\*(C'\fR is just like \f(CW\*(C`Symbol::qualify\*(C'\fR except that it
returns a glob ref rather than a symbol name, so you can use the result
even if \f(CW\*(C`use strict 'refs'\*(C'\fR is in effect.
.PP
\&\f(CW\*(C`Symbol::delete_package\*(C'\fR 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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