Re^2: Simple OO Question

As an expansion: _Print_Me() is expecting an argument (a reference to a hash), which it puts in $self. It then prints the hash element user out of that argument.

In your version of Show_Me, you don't pass it that expected argument. There are two ways to do so in this case: Using standard function notation (_Print_Me($self)) or using object notation, which implies the object itself as the first argument. ($self->_Print_Me())

Comment on Re^2: Simple OO Question Select or Download Code

Replies are listed 'Best First'.
Re^3: Simple OO Question by dsheroh (Monsignor) on Sep 16, 2010 at 13:21 UTC
As a further expansion: The difference between `_Print_Me($self)` and `$self->_Print_Me` is that `_Print_Me($self)` will always use the current package's `_Print_Me`, while `$self->_Print_Me` will find the appropriate `_Print_Me` for the package (class) that `$self` is blessed into. As a general rule, you'll want to use `_Print_Me($self)` when you want to use one specific implementation, no matter what, and use `$self->_Print_Me` when you want to allow for polymorphism (which should be almost always, since you never know when `$self` might belong to a subclass which has overridden `_Print_Me`).	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: Simple OO Question
by dsheroh (Monsignor) on Sep 16, 2010 at 13:21 UTC

_Print_Me($self)

$self->_Print_Me

_Print_Me($self)

_Print_Me

$self->_Print_Me

_Print_Me

$self

As a general rule, you'll want to use _Print_Me($self) when you want to use one specific implementation, no matter what, and use $self->_Print_Me when you want to allow for polymorphism (which should be almost always, since you never know when $self might belong to a subclass which has overridden _Print_Me).

[reply]
[d/l]
[select]