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.\" ========================================================================
.\"
.IX Title "AptPkg::Version 3pm"
.TH AptPkg::Version 3pm "2018-11-01" "perl v5.28.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
AptPkg::Version \- APT package versioning class
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
use AptPkg::Version;
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The AptPkg::Version module provides an interface to \fB\s-1APT\s0\fR's package
version handling.
.SS "AptPkg::Version"
.IX Subsection "AptPkg::Version"
The AptPkg::Version package implements the \fB\s-1APT\s0\fR pkgVersioningSystem
class.
.PP
An instance of the AptPkg::Version class may be fetched using the
\&\f(CW\*(C`versioning\*(C'\fR method from an AptPkg::System object.
.PP
The following methods are implemented:
.IP "label" 4
.IX Item "label"
Return the description of the versioning system, for example:
.Sp
.Vb 1
\&    Standard .deb
.Ve
.Sp
for Debian systems.
.IP "compare(\fIA\fR, \fIB\fR)" 4
.IX Item "compare(A, B)"
Compare package version \fIA\fR with \fIB\fR, returning a negative value if
\&\fIA\fR is an earlier version than \fIB\fR, zero if the same or a positive
value if \fIA\fR is later.
.IP "rel_compare(\fIA\fR, \fIB\fR)" 4
.IX Item "rel_compare(A, B)"
Compare distribution release numbers.
.IP "check_dep(\fI\s-1PKG\s0\fR, \fI\s-1OP\s0\fR, \fI\s-1DEP\s0\fR)" 4
.IX Item "check_dep(PKG, OP, DEP)"
Check that the package version \fI\s-1PKG\s0\fR satisfies the relation \fI\s-1OP\s0\fR to
the dependency version \fI\s-1DEP\s0\fR.
.Sp
The relation \fI\s-1OP\s0\fR is specified in the Debian syntax regardless of the
versioning system:
.Sp
.Vb 5
\&    <<  strictly earlier
\&    <=  earlier or equal
\&    =   exactly equal
\&    >=  later or equal
\&    >>  strictly later
.Ve
.IP "upstream(\fI\s-1VER\s0\fR)" 4
.IX Item "upstream(VER)"
Return the upstream component of the given version string.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBAptPkg::Config\fR\|(3pm), \fBAptPkg::System\fR\|(3pm), \fBAptPkg\fR\|(3pm).
.SH "AUTHOR"
.IX Header "AUTHOR"
Brendan O'Dea <bod@debian.org>