While the ::symbol can be thought of as similar to the period in a C struct,it is much more akin to the ::class scope operator in C++:a.b.c; /* something in C */ a::b::c(); // function in C++ $a::b::c; # a scalar in Perl 5 @a::b::c; # a list in Perl 5 %a::b::c; # an associative array or "hash" in Perl 5 &a::b::c; # a function in Perl 5
“::”符号可以认为是与C语言中的“.”相似,而它更像C++中的::类范围操作符.
$m = 5;
sub me
{
}
$main::m
&main::me
...
再问： so does it mean $:: equals $main::?
再答： 不是啊，可以加任意的闭包名称的，默认的话变量是在main的闭包里面
