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package Readonly; use 5.005; use strict; #use warnings; #no warnings 'uninitialized'; package Readonly; our $VERSION = '2.05'; $VERSION = eval $VERSION; # Autocroak (Thanks, MJD) # Only load Carp.pm if module is croaking. sub croak { require Carp; goto &Carp::croak; } # These functions may be overridden by Readonly::XS, if installed. use vars qw/$XSokay/; # Set to true in Readonly::XS, if available # Predeclare the following, so we can use them recursively sub _ARRAY (\@); sub _HASH (\%); # For perl 5.8.x or higher # These functions are exposed in perl 5.8.x (Thanks, Leon!) # They may be overridden by Readonly::XS, if installed on old perl versions if ($] < 5.008) { # 'Classic' perl is_sv_readonly = sub ($) {0}; make_sv_readonly = sub ($) { die "make_sv_readonly called but not overridden" }; # See if we can use the XS stuff. $Readonly::XS::MAGIC_COOKIE = $Readonly::XS::MAGIC_COOKIE = "Do NOT use or require Readonly::XS unless you're me."; eval 'use Readonly::XS'; } else { # Modern perl doesn't need Readonly::XS is_sv_readonly = sub ($) { Internals::SvREADONLY($_[0]) }; make_sv_readonly = sub ($) { Internals::SvREADONLY($_[0], 1) }; $XSokay = 1; # We're using the new built-ins so this is a white lie } # Undo setting readonly sub _SCALAR ($) { my ($r_var) = @_; if ($XSokay) { Internals::SvREADONLY($r_var, 0) if is_sv_readonly($r_var); } else { return if tied($r_var) !~ 'Readonly::Scalar'; my $r_scalar; { my $obj = tied $$r_var; $r_scalar = $obj; } untie $r_var; $r_var = $r_scalar; } } sub _ARRAY (\@) { my ($r_var) = @_; return if !tied(@$r_var); return if tied(@$r_var) !~ 'Readonly::Array'; my $r_array; { my $obj = tied @$r_var; $r_array = $obj; } untie @$r_var; @$r_var = @$r_array; # Recursively check child elements for references; clean if Readonly foreach (@$r_var) { my $_reftype = ref $_; if ($_reftype eq 'SCALAR') { _SCALAR($_) } elsif ($_reftype eq 'ARRAY') { _ARRAY(@$_); } elsif ($_reftype eq 'HASH') { _HASH(%$_); } } } sub _HASH (\%) { my ($r_var) = @_; return if !tied(%$r_var); return if tied(%$r_var) !~ 'Readonly::Hash'; my $r_hash; { my $obj = tied %$r_var; $r_hash = $obj; } untie %$r_var; %$r_var = %$r_hash; # Recursively check child elements for references; clean if Readonly foreach (values %$r_var) { my $_reftype = ref $_; if ($_reftype eq 'SCALAR') { _SCALAR($_) } elsif ($_reftype eq 'ARRAY') { _ARRAY(@$_); } elsif ($_reftype eq 'HASH') { _HASH(%$_); } } } # Common error messages, or portions thereof use vars qw/$MODIFY $REASSIGN $ODDHASH/; $MODIFY = 'Modification of a read-only value attempted'; $REASSIGN = 'Attempt to reassign a readonly'; $ODDHASH = 'May not store an odd number of values in a hash'; # ---------------- # Read-only scalars # ---------------- package Readonly::Scalar; sub STORABLE_freeze { my ($self, $cloning) = @_; Readonly::_SCALAR($$self) if $cloning; } sub TIESCALAR { my $whence = (caller 2)[3]; # Check if naughty user is trying to tie directly. Readonly::croak "Invalid tie" unless $whence && $whence =~ /^Readonly::(?:Scalar1?\|Readonly)$/; my $class = shift; Readonly::croak "No value specified for readonly scalar" unless @_; Readonly::croak "Too many values specified for readonly scalar" unless @_ == 1; my $value = shift; return bless \$value, $class; } sub FETCH { my $self = shift; return $$self; } STORE = STORE = sub { Readonly::croak $Readonly::MODIFY }; UNTIE = UNTIE = sub { Readonly::croak $Readonly::MODIFY if caller() ne 'Readonly' }; # ---------------- # Read-only arrays # ---------------- package Readonly::Array; sub STORABLE_freeze { my ($self, $cloning) = @_; Readonly::_ARRAY(@$self) if $cloning; } sub TIEARRAY { my $whence = (caller 1)[3]; # Check if naughty user is trying to tie directly. Readonly::croak "Invalid tie" unless $whence =~ /^Readonly::Array1?$/; my $class = shift; my @self = @_; return bless \@self, $class; } sub FETCH { my $self = shift; my $index = shift; return $self->[$index]; } sub FETCHSIZE { my $self = shift; return scalar @$self; } BEGIN { eval q{ sub EXISTS { my $self = shift; my $index = shift; return exists $self->[$index]; } } if $] >= 5.006; # couldn't do "exists" on arrays before then } STORE = STORESIZE = EXTEND = PUSH = POP = UNSHIFT = SHIFT = SPLICE = CLEAR = STORE = STORESIZE = EXTEND = PUSH = POP = UNSHIFT = SHIFT = SPLICE = CLEAR = sub { Readonly::croak $Readonly::MODIFY}; UNTIE = UNTIE = sub { Readonly::croak $Readonly::MODIFY if caller() ne 'Readonly' }; # ---------------- # Read-only hashes # ---------------- package Readonly::Hash; sub STORABLE_freeze { my ($self, $cloning) = @_; Readonly::_HASH(%$self) if $cloning; } sub TIEHASH { my $whence = (caller 1)[3]; # Check if naughty user is trying to tie directly. Readonly::croak "Invalid tie" unless $whence =~ /^Readonly::Hash1?$/; my $class = shift; # must have an even number of values Readonly::croak $Readonly::ODDHASH unless (@_ % 2 == 0); my %self = @_; return bless \%self, $class; } sub FETCH { my $self = shift; my $key = shift; return $self->{$key}; } sub EXISTS { my $self = shift; my $key = shift; return exists $self->{$key}; } sub FIRSTKEY { my $self = shift; my $dummy = keys %$self; return scalar each %$self; } sub NEXTKEY { my $self = shift; return scalar each %$self; } STORE = DELETE = CLEAR = STORE = DELETE = CLEAR = sub { Readonly::croak $Readonly::MODIFY}; UNTIE = UNTIE = sub { Readonly::croak $Readonly::MODIFY if caller() ne 'Readonly'; }; # ---------------------------------------------------------------- # Main package, containing convenience functions (so callers won't # have to explicitly tie the variables themselves). # ---------------------------------------------------------------- package Readonly; use Exporter; use vars qw/@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS/; push @ISA, 'Exporter'; push @EXPORT, qw/Readonly/; push @EXPORT_OK, qw/Scalar Array Hash Scalar1 Array1 Hash1/; # Predeclare the following, so we can use them recursively sub Scalar ($$); sub Array (\@;@); sub Hash (\%;@); # Returns true if a string begins with "Readonly::" # Used to prevent reassignment of Readonly variables. sub _is_badtype { my $type = $_[0]; return lc $type if $type =~ s/^Readonly:://; return; } # Shallow Readonly scalar sub Scalar1 ($$) { croak "$REASSIGN scalar" if is_sv_readonly($_[0]); my $badtype = _is_badtype(ref tied $_[0]); croak "$REASSIGN $badtype" if $badtype; # xs method: flag scalar as readonly if ($XSokay) { $_[0] = $_[1]; make_sv_readonly($_[0]); return; } # pure-perl method: tied scalar my $tieobj = eval { tie $_[0], 'Readonly::Scalar', $_[1] }; if ($@) { croak "$REASSIGN scalar" if substr($@, 0, 43) eq $MODIFY; die $@; # some other error? } return $tieobj; } # Shallow Readonly array sub Array1 (\@;@) { my $badtype = _is_badtype(ref tied $_[0]); croak "$REASSIGN $badtype" if $badtype; my $aref = shift; return tie @$aref, 'Readonly::Array', @_; } # Shallow Readonly hash sub Hash1 (\%;@) { my $badtype = _is_badtype(ref tied $_[0]); croak "$REASSIGN $badtype" if $badtype; my $href = shift; # If only one value, and it's a hashref, expand it if (@_ == 1 && ref $_[0] eq 'HASH') { return tie %$href, 'Readonly::Hash', %{$_[0]}; } # otherwise, must have an even number of values croak $ODDHASH unless (@_ % 2 == 0); return tie %$href, 'Readonly::Hash', @_; } # Deep Readonly scalar sub Scalar ($$) { croak "$REASSIGN scalar" if is_sv_readonly($_[0]); my $badtype = _is_badtype(ref tied $_[0]); croak "$REASSIGN $badtype" if $badtype; my $value = $_[1]; # Recursively check passed element for references; if any, make them Readonly foreach ($value) { if (ref eq 'SCALAR') { Scalar my $v => $$_; $_ = \$v } elsif (ref eq 'ARRAY') { Array my @v => @$_; $_ = \@v } elsif (ref eq 'HASH') { Hash my %v => $_; $_ = \%v } } # xs method: flag scalar as readonly if ($XSokay) { $_[0] = $value; make_sv_readonly($_[0]); return; } # pure-perl method: tied scalar my $tieobj = eval { tie $_[0], 'Readonly::Scalar', $value }; if ($@) { croak "$REASSIGN scalar" if substr($@, 0, 43) eq $MODIFY; die $@; # some other error? } return $tieobj; } # Deep Readonly array sub Array (\@;@) { my $badtype = _is_badtype(ref tied @{$_[0]}); croak "$REASSIGN $badtype" if $badtype; my $aref = shift; my @values = @_; # Recursively check passed elements for references; if any, make them Readonly foreach (@values) { if (ref eq 'SCALAR') { Scalar my $v => $$_; $_ = \$v } elsif (ref eq 'ARRAY') { Array my @v => @$_; $_ = \@v } elsif (ref eq 'HASH') { Hash my %v => $_; $_ = \%v } } # Lastly, tie the passed reference return tie @$aref, 'Readonly::Array', @values; } # Deep Readonly hash sub Hash (\%;@) { my $badtype = _is_badtype(ref tied %{$_[0]}); croak "$REASSIGN $badtype" if $badtype; my $href = shift; my @values = @_; # If only one value, and it's a hashref, expand it if (@_ == 1 && ref $_[0] eq 'HASH') { @values = %{$_[0]}; } # otherwise, must have an even number of values croak $ODDHASH unless (@values % 2 == 0); # Recursively check passed elements for references; if any, make them Readonly foreach (@values) { if (ref eq 'SCALAR') { Scalar my $v => $$_; $_ = \$v } elsif (ref eq 'ARRAY') { Array my @v => @$_; $_ = \@v } elsif (ref eq 'HASH') { Hash my %v => $_; $_ = \%v } } return tie %$href, 'Readonly::Hash', @values; } sub Clone(\[$@%]) { require Storable; my $retval = Storable::dclone($_[0]); $retval = $$retval if ref $retval eq 'REF'; my $reftype = ref $retval; if ($reftype eq 'SCALAR') { _SCALAR($retval); return $$retval; } elsif ($reftype eq 'ARRAY') { _ARRAY(@$retval); } elsif ($reftype eq 'HASH') { _HASH(%$retval); return %$retval if wantarray; } return $retval; } # Common entry-point for all supported data types eval q{sub Readonly} . ($] < 5.008 ? '' : '(\[$@%]@)') . <<'SUB_READONLY'; { if (ref $_[0] eq 'SCALAR') { croak $MODIFY if is_sv_readonly ${$_[0]}; my $badtype = _is_badtype (ref tied ${$_[0]}); croak "$REASSIGN $badtype" if $badtype; croak "Readonly scalar must have only one value" if @_ > 2; # Because of problems with handling \$ prototypes declarations like # Readonly my @a = ... and Readonly my %h = ... are also caught here croak 'Invalid initialization by assignment' if @_ == 1 && defined ${$_[0]}; my $tieobj = eval {tie ${$_[0]}, 'Readonly::Scalar', $_[1]}; # Tie may have failed because user tried to tie a constant, or we screwed up somehow. if ($@) { croak $MODIFY if $@ =~ /^$MODIFY at/; # Point the finger at the user. die "$@\n"; # Not a modify read-only message; must be our fault. } return $tieobj; } elsif (ref $_[0] eq 'ARRAY') { my $aref = shift; return Array @$aref, @_; } elsif (ref $_[0] eq 'HASH') { my $href = shift; croak $ODDHASH if @_%2 != 0 && !(@_ == 1 && ref $_[0] eq 'HASH'); return Hash %$href, @_; } elsif (ref $_[0]) { croak "Readonly only supports scalar, array, and hash variables."; } else { croak "First argument to Readonly must be a reference."; } } SUB_READONLY 1; =head1 NAME Readonly - Facility for creating read-only scalars, arrays, hashes =head1 Synopsis use Readonly; # Deep Read-only scalar Readonly::Scalar $sca => $initial_value; Readonly::Scalar my $sca => $initial_value; # Deep Read-only array Readonly::Array @arr => @values; Readonly::Array my @arr => @values; # Deep Read-only hash Readonly::Hash %has => (key => value, key => value, ...); Readonly::Hash my %has => (key => value, key => value, ...); # or: Readonly::Hash %has => {key => value, key => value, ...}; # You can use the read-only variables like any regular variables: print $sca; $something = $sca + $arr[2]; next if $has{$some_key}; # But if you try to modify a value, your program will die: $sca = 7; push @arr, 'seven'; delete $has{key}; # The error message is "Modification of a read-only value attempted" # Alternate form (Perl 5.8 and later) Readonly $sca => $initial_value; Readonly my $sca => $initial_value; Readonly @arr => @values; Readonly my @arr => @values; Readonly %has => (key => value, key => value, ...); Readonly my %has => (key => value, key => value, ...); Readonly my $sca; # Implicit undef, readonly value # Alternate form (for Perls earlier than v5.8) Readonly \$sca => $initial_value; Readonly \my $sca => $initial_value; Readonly \@arr => @values; Readonly \my @arr => @values; Readonly \%has => (key => value, key => value, ...); Readonly \my %has => (key => value, key => value, ...); =head1 Description This is a facility for creating non-modifiable variables. This is useful for configuration files, headers, etc. It can also be useful as a development and debugging tool for catching updates to variables that should not be changed. =head1 Variable Depth Readonly has the ability to create both deep and shallow readonly variables. If you pass a C<$ref>, an C<@array> or a C<%hash> to corresponding functions C<::Scalar()>, C<::Array()> and C<::Hash()>, then those functions recurse over the data structure, marking everything as readonly. The entire structure is then non-modifiable. This is normally what you want. If you want only the top level to be readonly, use the alternate (and poorly named) C<::Scalar1()>, C<::Array1()>, and C<::Hash1()> functions. Plain C<Readonly()> creates what the original author calls a "shallow" readonly variable, which is great if you don't plan to use it on anything but only one dimensional scalar values. C<Readonly::Scalar()> makes the variable 'deeply' readonly, so the following snippet kills over as you expect: use Readonly; Readonly::Scalar my $ref => { 1 => 'a' }; $ref->{1} = 'b'; $ref->{2} = 'b'; While the following snippet does B<not> make your structure 'deeply' readonly: use Readonly; Readonly my $ref => { 1 => 'a' }; $ref->{1} = 'b'; $ref->{2} = 'b'; =head1 =head1 The Past The following sections are updated versions of the previous authors documentation. =head2 Comparison with "use constant" Perl provides a facility for creating constant values, via the L<constant> pragma. There are several problems with this pragma. =over 2 =item * The constants created have no leading sigils. =item * These constants cannot be interpolated into strings. =item * Syntax can get dicey sometimes. For example: use constant CARRAY => (2, 3, 5, 7, 11, 13); $a_prime = CARRAY[2]; # wrong! $a_prime = (CARRAY)[2]; # right -- MUST use parentheses =item * You have to be very careful in places where barewords are allowed. For example: use constant SOME_KEY => 'key'; %hash = (key => 'value', other_key => 'other_value'); $some_value = $hash{SOME_KEY}; # wrong! $some_value = $hash{+SOME_KEY}; # right (who thinks to use a unary plus when using a hash to scalarize the key?) =item * C<use constant> works for scalars and arrays, not hashes. =item * These constants are global to the package in which they're declared; cannot be lexically scoped. =item * Works only at compile time. =item * Can be overridden: use constant PI => 3.14159; ... use constant PI => 2.71828; (this does generate a warning, however, if you have warnings enabled). =item * It is very difficult to make and use deep structures (complex data structures) with C<use constant>. =back =head1 Comparison with typeglob constants Another popular way to create read-only scalars is to modify the symbol table entry for the variable by using a typeglob: a = \'value'; This works fine, but it only works for global variables ("my" variables have no symbol table entry). Also, the following similar constructs do B<not> work: a = [1, 2, 3]; # Does NOT create a read-only array a = { a => 'A'}; # Does NOT create a read-only hash =head2 Pros Readonly.pm, on the other hand, will work with global variables and with lexical ("my") variables. It will create scalars, arrays, or hashes, all of which look and work like normal, read-write Perl variables. You can use them in scalar context, in list context; you can take references to them, pass them to functions, anything. Readonly.pm also works well with complex data structures, allowing you to tag the whole structure as nonmodifiable, or just the top level. Also, Readonly variables may not be reassigned. The following code will die: Readonly::Scalar $pi => 3.14159; ... Readonly::Scalar $pi => 2.71828; =head2 Cons Readonly.pm used to impose a performance penalty. It was pretty slow. How slow? Run the C<eg/benchmark.pl> script that comes with Readonly. On my test system, "use constant" (const), typeglob constants (tglob), regular read/write Perl variables (normal/literal), and the new Readonly (ro/ro_simple) are all about the same speed, the old, tie based Readonly.pm constants were about 1/22 the speed. However, there is relief. There is a companion module available, Readonly::XS. You won't need this if you're using Perl 5.8.x or higher. I repeat, you do not need Readonly::XS if your environment has perl 5.8.x or higher. Please see section entitled L<Internals\|/"Internals"> for more. =head1 Functions =over 4 =item Readonly::Scalar $var => $value; Creates a nonmodifiable scalar, C<$var>, and assigns a value of C<$value> to it. Thereafter, its value may not be changed. Any attempt to modify the value will cause your program to die. A value I<must> be supplied. If you want the variable to have C<undef> as its value, you must specify C<undef>. If C<$value> is a reference to a scalar, array, or hash, then this function will mark the scalar, array, or hash it points to as being Readonly as well, and it will recursively traverse the structure, marking the whole thing as Readonly. Usually, this is what you want. However, if you want only the C<$value> marked as Readonly, use C<Scalar1>. If $var is already a Readonly variable, the program will die with an error about reassigning Readonly variables. =item Readonly::Array @arr => (value, value, ...); Creates a nonmodifiable array, C<@arr>, and assigns the specified list of values to it. Thereafter, none of its values may be changed; the array may not be lengthened or shortened or spliced. Any attempt to do so will cause your program to die. If any of the values passed is a reference to a scalar, array, or hash, then this function will mark the scalar, array, or hash it points to as being Readonly as well, and it will recursively traverse the structure, marking the whole thing as Readonly. Usually, this is what you want. However, if you want only the hash C<%@arr> itself marked as Readonly, use C<Array1>. If C<@arr> is already a Readonly variable, the program will die with an error about reassigning Readonly variables. =item Readonly::Hash %h => (key => value, key => value, ...); =item Readonly::Hash %h => {key => value, key => value, ...}; Creates a nonmodifiable hash, C<%h>, and assigns the specified keys and values to it. Thereafter, its keys or values may not be changed. Any attempt to do so will cause your program to die. A list of keys and values may be specified (with parentheses in the synopsis above), or a hash reference may be specified (curly braces in the synopsis above). If a list is specified, it must have an even number of elements, or the function will die. If any of the values is a reference to a scalar, array, or hash, then this function will mark the scalar, array, or hash it points to as being Readonly as well, and it will recursively traverse the structure, marking the whole thing as Readonly. Usually, this is what you want. However, if you want only the hash C<%h> itself marked as Readonly, use C<Hash1>. If C<%h> is already a Readonly variable, the program will die with an error about reassigning Readonly variables. =item Readonly $var => $value; =item Readonly @arr => (value, value, ...); =item Readonly %h => (key => value, ...); =item Readonly %h => {key => value, ...}; =item Readonly $var; The C<Readonly> function is an alternate to the C<Scalar>, C<Array>, and C<Hash> functions. It has the advantage (if you consider it an advantage) of being one function. That may make your program look neater, if you're initializing a whole bunch of constants at once. You may or may not prefer this uniform style. It has the disadvantage of having a slightly different syntax for versions of Perl prior to 5.8. For earlier versions, you must supply a backslash, because it requires a reference as the first parameter. Readonly \$var => $value; Readonly \@arr => (value, value, ...); Readonly \%h => (key => value, ...); Readonly \%h => {key => value, ...}; You may or may not consider this ugly. Note that you can create implicit undefined variables with this function like so C<Readonly my $var;> while a verbose undefined value must be passed to the standard C<Scalar>, C<Array>, and C<Hash> functions. =item Readonly::Scalar1 $var => $value; =item Readonly::Array1 @arr => (value, value, ...); =item Readonly::Hash1 %h => (key => value, key => value, ...); =item Readonly::Hash1 %h => {key => value, key => value, ...}; These alternate functions create shallow Readonly variables, instead of deep ones. For example: Readonly::Array1 @shal => (1, 2, {perl=>'Rules', java=>'Bites'}, 4, 5); Readonly::Array @deep => (1, 2, {perl=>'Rules', java=>'Bites'}, 4, 5); $shal[1] = 7; # error $shal[2]{APL}='Weird'; # Allowed! since the hash isn't Readonly $deep[1] = 7; # error $deep[2]{APL}='Weird'; # error, since the hash is Readonly =back =head1 Cloning When cloning using L<Storable> or L<Clone> you will notice that the value stays readonly, which is correct. If you want to clone the value without copying the readonly flag, use the C<Clone> function: Readonly::Scalar my $scalar => {qw[this that]}; # $scalar->{'eh'} = 'foo'; # Modification of a read-only value attempted my $scalar_clone = Readonly::Clone $scalar; $scalar_clone->{'eh'} = 'foo'; # $scalar_clone is now {this => 'that', eh => 'foo'}; The new variable (C<$scalar_clone>) is a mutable clone of the original C<$scalar>. =head1 Examples These are a few very simple examples: =head2 Scalars A plain old read-only value Readonly::Scalar $a => "A string value"; The value need not be a compile-time constant: Readonly::Scalar $a => $computed_value; =head2 Arrays/Lists A read-only array: Readonly::Array @a => (1, 2, 3, 4); The parentheses are optional: Readonly::Array @a => 1, 2, 3, 4; You can use Perl's built-in array quoting syntax: Readonly::Array @a => qw/1 2 3 4/; You can initialize a read-only array from a variable one: Readonly::Array @a => @computed_values; A read-only array can be empty, too: Readonly::Array @a => (); Readonly::Array @a; # equivalent =head2 Hashes Typical usage: Readonly::Hash %a => (key1 => 'value1', key2 => 'value2'); A read-only hash can be initialized from a variable one: Readonly::Hash %a => %computed_values; A read-only hash can be empty: Readonly::Hash %a => (); Readonly::Hash %a; # equivalent If you pass an odd number of values, the program will die: Readonly::Hash %a => (key1 => 'value1', "value2"); # This dies with "May not store an odd number of values in a hash" =head1 Exports Historically, this module exports the C<Readonly> symbol into the calling program's namespace by default. The following symbols are also available for import into your program, if you like: C<Scalar>, C<Scalar1>, C<Array>, C<Array1>, C<Hash>, and C<Hash1>. =head1 Internals Some people simply do not understand the relationship between this module and Readonly::XS so I'm adding this section. Odds are, they still won't understand but I like to write so... In the past, Readonly's "magic" was performed by C<tie()>-ing variables to the C<Readonly::Scalar>, C<Readonly::Array>, and C<Readonly::Hash> packages (not to be confused with the functions of the same names) and acting on C<WRITE>, C<READ>, et. al. While this worked well, it was slow. Very slow. Like 20-30 times slower than accessing variables directly or using one of the other const-related modules that have cropped up since Readonly was released in 2003. To 'fix' this, Readonly::XS was written. If installed, Readonly::XS used the internal methods C<SvREADONLY> and C<SvREADONLY_on> to lock simple scalars. On the surface, everything was peachy but things weren't the same behind the scenes. In edge cases, code performed very differently if Readonly::XS was installed and because it wasn't a required dependency in most code, it made downstream bugs very hard to track. In the years since Readonly::XS was released, the then private internal methods have been exposed and can be used in pure perl. Similar modules were written to take advantage of this and a patch to Readonly was created. We no longer need to build and install another module to make Readonly useful on modern builds of perl. =over =item You do not need to install Readonly::XS. =item * You should stop listing Readonly::XS as a dependency or expect it to be installed. =item * Stop testing the C<$Readonly::XSokay> variable! =back =head1 Requirements Please note that most users of Readonly no longer need to install the companion module Readonly::XS which is recommended but not required for perl 5.6.x and under. Please do not force it as a requirement in new code and do not use the package variable C<$Readonly::XSokay> in code/tests. For more, see L<the section on Readonly's new internals/Internals>. There are no non-core requirements. =head1 Bug Reports If email is better for you, L<my address is mentioned below\|/"Author"> but I would rather have bugs sent through the issue tracker found at http://github.com/sanko/readonly/issues. =head1 Acknowledgements Thanks to Slaven Rezic for the idea of one common function (Readonly) for all three types of variables (13 April 2002). Thanks to Ernest Lergon for the idea (and initial code) for deeply-Readonly data structures (21 May 2002). Thanks to Damian Conway for the idea (and code) for making the Readonly function work a lot smoother under perl 5.8+. =head1 Author Sanko Robinson <sanko@cpan.org> - http://sankorobinson.com/ CPAN ID: SANKO Original author: Eric J. Roode, roode@cpan.org =head1 License and Legal Copyright (C) 2013-2016 by Sanko Robinson <sanko@cpan.org> Copyright (c) 2001-2004 by Eric J. Roode. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut

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