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Dpkg::Version(3perl)		 libdpkg-perl		  Dpkg::Version(3perl)

       Dpkg::Version - handling	and comparing dpkg-style version numbers

       The Dpkg::Version module	provides pure-Perl routines to compare dpkg-
       style version numbers (as used in Debian	packages) and also an object
       oriented	interface overriding perl operators to do the right thing when
       you compare Dpkg::Version object	between	them.

       $v = Dpkg::Version->new($version, %opts)
	   Create a new	Dpkg::Version object corresponding to the version
	   indicated in	the string (scalar) $version. By default it will
	   accepts any string and consider it as a valid version. If you pass
	   the option "check =>	1", it will return undef if the	version	is
	   invalid (see	version_check for details).

	   You can always call $v->is_valid() later on to verify that the
	   version is valid.

       boolean evaluation
	   When	the Dpkg::Version object is used in a boolean evaluation (for
	   example in "if ($v)"	or "$v ? \"$v\"	: 'default'") it returns true
	   if the version stored is valid ($v->is_valid()) and false

	   Notice: Between dpkg and 1.19.1 this overload used to
	   return $v->as_string() if $v->is_valid(), a breaking	change in
	   behavior that caused	"0" versions to	be evaluated as	false. To
	   catch any possibly intended code that relied	on those semantics,
	   this	overload will emit a warning with category
	   "Dpkg::Version::semantic_change::overload::bool" until dpkg 1.20.x.
	   Once	fixed, or for already valid code the warning can be quiesced

	     no	if $Dpkg::Version::VERSION ge '1.02',
		warnings => qw(Dpkg::Version::semantic_change::overload::bool);

	   added after the "use	Dpkg::Version".

	   Returns true	if the version is valid, false otherwise.

       $v->epoch(), $v->version(), $v->revision()
	   Returns the corresponding part of the full version string.

	   Returns true	if the version is native, false	if it has a revision.

       $v1 <=> $v2, $v1	< $v2, $v1 <= $v2, $v1 > $v2, $v1 >= $v2
	   Numerical comparison	of various versions numbers. One of the	two
	   operands needs to be	a Dpkg::Version, the other one can be anything
	   provided that its string representation is a	version	number.

       "$v", $v->as_string(), $v->as_string(%options)
	   Accepts an optional option hash reference, affecting	the string


	   omit_epoch (defaults	to 0)
		   Omit	the epoch, if present, in the output string.

	   omit_revision (defaults to 0)
		   Omit	the revision, if present, in the output	string.

	   Returns the string representation of	the version number.

       All the functions are exported by default.

       version_compare($a, $b)
	   Returns -1 if $a is earlier than $b,	0 if they are equal and	1 if
	   $a is later than $b.

	   If $a or $b are not valid version numbers, it dies with an error.

       version_compare_relation($a, $rel, $b)
	   Returns the result (0 or 1) of the given comparison operation. This
	   function is implemented on top of version_compare().

	   Allowed values for $rel are the exported constants REL_GT, REL_GE,
	   REL_EQ, REL_LE, REL_LT. Use version_normalize_relation() if you
	   have	an input string	containing the operator.

       $rel = version_normalize_relation($rel_string)
	   Returns the normalized constant of the relation $rel	(a value among
	   REL_GT, REL_GE, REL_EQ, REL_LE and REL_LT). Supported relations
	   names in input are: "gt", "ge", "eq", "le", "lt", ">>", ">=", "=",
	   "<=", "<<". ">" and "<" are also supported but should not be	used
	   as they are obsolete	aliases	of ">="	and "<=".

       version_compare_string($a, $b)
	   String comparison function used for comparing non-numerical parts
	   of version numbers. Returns -1 if $a	is earlier than	$b, 0 if they
	   are equal and 1 if $a is later than $b.

	   The "~" character always sort lower than anything else. Digits sort
	   lower than non-digits. Among	remaining characters alphabetic
	   characters (A-Z, a-z) sort lower than the other ones. Within	each
	   range, the ASCII decimal value of the character is used to sort
	   between characters.

       version_compare_part($a,	$b)
	   Compare two corresponding sub-parts of a version number (either
	   upstream version or debian revision).

	   Each	parameter is split by version_split_digits() and resulting
	   items are compared together.	As soon	as a difference	happens, it
	   returns -1 if $a is earlier than $b,	0 if they are equal and	1 if
	   $a is later than $b.

       @items =	version_split_digits($version)
	   Splits a string in items that are each entirely composed either of
	   digits or of	non-digits. For	instance for "1.024~beta1+svn234" it
	   would return	("1", ".", "024", "~beta", "1",	"+svn",	"234").

       ($ok, $msg) = version_check($version)
       $ok = version_check($version)
	   Checks the validity of $version as a	version	number.	Returns	1 in
	   $ok if the version is valid,	0 otherwise. In	the latter case, $msg
	   contains a description of the problem with the $version scalar.

   Version 1.02	(dpkg 1.19.1)
       Semantic	change:	bool evaluation	semantics restored to their original

   Version 1.01	(dpkg 1.17.0)
       New argument: Accept an options argument	in $v->as_string().

       New method: $v->is_native().

   Version 1.00	(dpkg 1.15.6)
       Mark the	module as public.

1.19.7				  2019-04-19		  Dpkg::Version(3perl)


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