[ 源代码： libclass-perl ]
软件包：libclass-perl（1.1.7-2）
module providing aliases for __PACKAGE__
CLASS is a minimalistic Perl module that simply provides aliases for the special literal, __PACKAGE__, which represents the current package name at that point during program execution. The aliases are mapped at compile-time, so there is no performance hit except for compilation of the module itself.
This module ensures that CLASS and $CLASS can be used anywhere in place of __PACKAGE__, and since $CLASS is a scalar, it has the additional benefit of working in strings.