[Fwd: perl AUTOLOADER vs c++]

[Billy N. Patton]

-------- Original Message --------
Subject: perl AUTOLOADER vs c++
Date: Fri, 15 Oct 2004 13:28:18 -0500
From: Billy N. Patton <[email protected]>
Organization: Texas Instruments
Newsgroups: alt.comp.lang.learn.c-c++

Assume I have a perl class/module called Ui.

The need for this is to have ALL io the exact same.

If I need a new switch my command line parser will just add it to the
hash of the blessed class. I don't have to export the method to get to
the data I can simple call the class with the proper name and the
autoload will take care of the rest, With a little coding in the auto
loader.
Ex:
if I pass in -abc some_value.
the command line parser will set in my hash 'abc' => 'some_value'

With out the autoloader I have no access unless I've exported the hash
But with the autoloader I can do
$val = $ui->abc();


I've created a Ui class in C++. All the variables are declared as
static. I only want one copy of each variable.
Currently, I'm having to do a get and a set type method for each
variable in my private section.

Does c++ have something similar to perls autoloader?
THis would greatly increase the functionality of my Ui class.
Dynamic switches and methods

--
___ _ ____ ___ __ __
/ _ )(_) / /_ __ / _ \___ _/ /_/ /____ ___
/ _ / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/ \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455, (e-mail address removed)

--
___ _ ____ ___ __ __
/ _ )(_) / /_ __ / _ \___ _/ /_/ /____ ___
/ _ / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/ \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455, (e-mail address removed)

 

[David Hilsee]

-------- Original Message --------
Subject: perl AUTOLOADER vs c++
Date: Fri, 15 Oct 2004 13:28:18 -0500
From: Billy N. Patton <[email protected]>
Organization: Texas Instruments
Newsgroups: alt.comp.lang.learn.c-c++

Assume I have a perl class/module called Ui.

The need for this is to have ALL io the exact same.

If I need a new switch my command line parser will just add it to the
hash of the blessed class. I don't have to export the method to get to
the data I can simple call the class with the proper name and the
autoload will take care of the rest, With a little coding in the auto
loader.
Ex:
if I pass in -abc some_value.
the command line parser will set in my hash 'abc' => 'some_value'

With out the autoloader I have no access unless I've exported the hash
But with the autoloader I can do
$val = $ui->abc();


I've created a Ui class in C++. All the variables are declared as
static. I only want one copy of each variable.
Currently, I'm having to do a get and a set type method for each
variable in my private section.

Does c++ have something similar to perls autoloader?
THis would greatly increase the functionality of my Ui class.
Dynamic switches and methods

Perl and C++ are very different languages. C++ doesn't have Perl's AUTOLOAD
feature or AutoLoader module (which presumably depends on the AUTOLOAD
feature). Functions must be declared before they are used, and you can't
depend on a "magic" function "finding" the function's definition for you at
runtime (at least, not on any implementation I've ever seen). I see a few
options. You can either write getters/setters by hand, make the data
members public (blech), or instead use an associative container like a
std::map<std::string,SomeType> to map a string key to its value. Then you
could just write

SomeType GetSomeType( const std::string& key ) {
// may want to throw an exception if key is not in map
return container[key];
}

I'd probably just write the getter and setter for each member unless there
are a lot of members, in which case I might consider using the associative
container.