ЭЛЕКТРОННАЯ БИБЛИОТЕКА КОАПП |
Сборники Художественной, Технической, Справочной, Английской, Нормативной, Исторической, и др. литературы. |
D.9 PackagesWhen multiple people work on a project, or if you're slightly schizophrenic, you can carve up the variable namespace using packages. A package is just a hidden prefix put in front of most variables (except variables created with the $a = 123; # this is really $main::a $main::a++; # same variable, now 124 package fred; # now the prefix is "fred" $a = 456; # this is $fred::a print $a - $main::a; # prints 456-124 package main; # back to original default print $a + $fred::a; # prints 124+456 So, any name with an explicit package name is used as-is, but all other names get packaged into the current default package. Packages are local to the current file or block, and you always start out in package |