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

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对象(实例)函数调用

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

?第一个参数是instace

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bless的解释可参见

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

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bless in perldoc

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

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my $scalar;

my @array;

my %hash;

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

bless $instance $class;

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ref in perldoc

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

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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";}