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.\" ========================================================================
.\"
.IX Title "deprecate 3"
.TH deprecate 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
deprecate \- Perl pragma for deprecating the inclusion of a module in core
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use deprecate;  # warn about future absence if loaded from core
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This pragma simplifies the maintenance of dual-life modules that will no longer
be included in the Perl core in a future Perl release, but are still included
currently.
.PP
The purpose of the pragma is to alert users to the status of such a module by
issuing a warning that encourages them to install the module from \s-1CPAN,\s0 so that
a future upgrade to a perl which omits the module will not break their code.
.PP
This warning will only be issued if the module was loaded from a core library
directory, which allows the \f(CW\*(C`use deprecate\*(C'\fR line to be included in the \s-1CPAN\s0
version of the module. Because the pragma remains silent when the module is run
from a non-core library directory, the pragma call does not need to be patched
into or out of either the core or \s-1CPAN\s0 version of the module. The exact same
code can be shipped for either purpose.
.SS "Important Caveat"
.IX Subsection "Important Caveat"
Note that when a module installs from \s-1CPAN\s0 to a core library directory rather
than the site library directories, the user gains no protection from having
installed it.
.PP
At the same time, this pragma cannot detect when such a module has installed
from \s-1CPAN\s0 to the core library, and so it would endlessly and uselessly exhort
the user to upgrade.
.PP
Therefore modules that can install from \s-1CPAN\s0 to the core library must make sure
not to call this pragma when they have done so. Generally this means that the
exact logic from the installer must be mirrored inside the module. E.g.:
.PP
.Vb 5
\&    # Makefile.PL
\&    WriteMakefile(
\&        # ...
\&        INSTALLDIRS => ( "$]" >= 5.011 ? \*(Aqsite\*(Aq : \*(Aqperl\*(Aq ),
\&    );
\&
\&    # lib/Foo/Bar.pm
\&    use if "$]" >= 5.011, \*(Aqdeprecate\*(Aq;
.Ve
.PP
(The above example shows the most important case of this: when the target is
a Perl older than 5.12 (where the core library directories take precedence over
the site library directories) and the module being installed was included in
core in that Perl version. Under those circumstances, an upgrade of the module
from \s-1CPAN\s0 is only possible by installing to the core library.)
.SH "EXPORT"
.IX Header "EXPORT"
None by default.  The only method is \f(CW\*(C`import\*(C'\fR, called by \f(CW\*(C`use deprecate;\*(C'\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
First example to \f(CW\*(C`use deprecate;\*(C'\fR was Switch.
.SH "AUTHOR"
.IX Header "AUTHOR"
Original version by Nicholas Clark
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (C) 2009, 2011
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.10.0 or,
at your option, any later version of Perl 5 you may have available.