Perl: class method and instance method

类函数调用

Class->method(@arg)===================Class::method('Class', @args);

第一个参数是类名称

 

对象(实例)函数调用

Instance->method(@arg)=================Class::method(Instance, @arg);

 第一个参数是instace

 

bless的解释可参见

http://bbs2.chinaunix.net/viewthread.php?tid=981190

 

bless in perldoc

http://perldoc.perl.org/functions/bless.html

 

my $scalar;

my @array;

my %hash;

my $instance = /$scalar(/@array, %hash)

bless $instance $class;

 

ref in perldoc

http://perldoc.perl.org/functions/ref.html

 

ref EXPR

判断变量是否是reference

ref $either ? $$either          #this is a reference

                  : "not ref";          #this is not a ref

如果EXPR是ref，返回一个非空字符串，反之返回空字符串。返回值依赖ref引用的类型。内嵌类型包括：

1.     SCALAR
2.     ARRAY
3.     HASH
4.     CODE
5.     REF
6.     GLOB
7.     LVALUE
8.     FORMAT
9.     IO
10.     VSTRING
11.     Regexp

my $num = 0;
my $scaref = /$num;

if (ref $scaref eq "SCALAR") {
 print "this is a scalar reference./n";
}