diff options
Diffstat (limited to 'pod/perldata.pod')
| -rw-r--r-- | pod/perldata.pod | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/pod/perldata.pod b/pod/perldata.pod index 1878f4a5fa..f0837b3854 100644 --- a/pod/perldata.pod +++ b/pod/perldata.pod @@ -247,6 +247,11 @@ The usual Unix backslash rules apply for making characters such as newline, tab, etc., as well as some more exotic forms. See L<perlop/Quote and Quotelike Operators> for a list. +Octal or hex representations in string literals (e.g. '0xffff') are not +automatically converted to their integer representation. The hex() and +oct() functions make these conversions for you. See L<perlfunc/hex> and +L<perlfunc/oct> for more details. + You can also embed newlines directly in your strings, i.e., they can end on a different line than they begin. This is nice, but if you forget your trailing quote, the error will not be reported until Perl finds @@ -279,16 +284,19 @@ single-quoted string must be separated from a preceding word by a space, because single quote is a valid (though deprecated) character in a variable name (see L<perlmod/Packages>). -Two special literals are __LINE__ and __FILE__, which represent the -current line number and filename at that point in your program. They -may be used only as separate tokens; they will not be interpolated into -strings. In addition, the token __END__ may be used to indicate the -logical end of the script before the actual end of file. Any following -text is ignored, but may be read via the DATA filehandle. (The DATA -filehandle may read data from only the main script, but not from any -required file or evaluated string.) The two control characters ^D and -^Z are synonyms for __END__ (or __DATA__ in a module; see L<SelfLoader> for -details on __DATA__). +Three special literals are __FILE__, __LINE__, and __PACKAGE__, which +represent the current filename, line number, and package name at that +point in your program. They may be used only as separate tokens; they +will not be interpolated into strings. If there is no current package +(due to a C<package;> directive), __PACKAGE__ is the undefined value. + +The tokens __END__ and __DATA__ may be used to indicate the logical end +of the script before the actual end of file. Any following text is +ignored, but may be read via a DATA filehandle: main::DATA for __END__, +or PACKNAME::DATA (where PACKNAME is the current package) for __DATA__. +The two control characters ^D and ^Z are synonyms for __END__ (or +__DATA__ in a module). See L<SelfLoader> for more description of +__DATA__, and an example of its use. A word that has no other interpretation in the grammar will be treated as if it were a quoted string. These are known as @@ -440,6 +448,11 @@ put the list in parentheses to avoid ambiguity. Examples: # A "reverse comma operator". return (pop(@foo),pop(@foo))[0]; +You may assign to C<undef> in a list. This is useful for throwing +away some of the return values of a function: + + ($dev, $ino, undef, undef, $uid, $gid) = stat($file); + Lists may be assigned to if and only if each element of the list is legal to assign to: |