dist_tools/

mg_cmp_version.pro

Routines

top mg_cmp_version

result = mg_cmp_version(version1, version2)

Compares two version numbers for the more updated number. Returns 0 for equal versions, 1 if version1 is later than version2, and -1 if version1 is earlier than version2. Strings such as 'alpha' and 'beta' may be tacked on to the end of a version, but are compared alphabetically.

Return value

-1, 0, or 1

Parameters

version1 in required type=string: first version number
version2 in required type=string: second version number

Examples

For example, 1.2 is later than 1.1.2:

  IDL> print, mg_cmp_version('1.2', '1.1.2')
         1

And 1.2 is earlier than 1.3:

  IDL> print, mg_cmp_version('1.2', '1.3')
        -1

And 1.2 is equivalent to itself:

  IDL> print, mg_cmp_version('1.2', '1.2')
         0

Also, try the main-level example program at the end of this file:

  IDL> .run mg_cmp_version
                      1.2     1.1.2       1.1  1.1alpha   1.1beta
         1.2 >          0         1         1         1         1
       1.1.2 >         -1         0         1         1         1
         1.1 >         -1        -1         0         1         1
    1.1alpha >         -1        -1        -1         0        -1
     1.1beta >         -1        -1        -1         1         0

File attributes

Modification date:	Wed May 14 15:07:14 2014
Lines:	40
Docformat:	rst rst

Personal library of Michael Galloy
Contact me if you have enhancement requests or bug fixes.

mglib

Personal IDL library for M. Galloy