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Diffstat (limited to 'pod/perldata.pod')
| -rw-r--r-- | pod/perldata.pod | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/pod/perldata.pod b/pod/perldata.pod index a122d34c80..4dbc76564e 100644 --- a/pod/perldata.pod +++ b/pod/perldata.pod @@ -274,6 +274,7 @@ integer formats: 0xff # hex 0377 # octal 0b011011 # binary + v102.111.111 # string (made of characters "f", "o", "o") String literals are usually delimited by either single or double quotes. They work much like quotes in the standard Unix shells: @@ -323,6 +324,17 @@ C<$days{Feb}> and the quotes will be assumed automatically. But anything more complicated in the subscript will be interpreted as an expression. +A literal of the form C<v1.20.300.4000> is parsed as a string composed +of characters with the specified ordinals. This provides an alternative, +more readable way to construct strings, rather than use the somewhat less +readable interpolation form C<"\x{1}\x{14}\x{12c}\x{fa0}">. This is useful +for representing Unicode strings, and for comparing version "numbers" +using the string comparison operators, C<cmp>, C<gt>, C<lt> etc. +If there are two or more dots in the literal, the leading C<v> may be +omitted. Such literals are accepted by both C<require> and C<use> for +doing a version check. The C<$^V> special variable also contains the +running Perl interpreter's version in this form. See L<perlvar/$^V>. + The special literals __FILE__, __LINE__, and __PACKAGE__ represent the current filename, line number, and package name at that point in your program. They may be used only as separate tokens; they |