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Full Discussion: * vs &
Top Forums Programming * vs & Post 29606 by cbkihong on Wednesday 9th of October 2002 10:44:19 AM
Old 10-09-2002
Re: * vs &

Quote:
Originally posted by bb00y
what's the difference between *(pointer) and &(reference)? sometime i see code use * and sometime it uses &, i'm comfuse as when to use which.
thanks.
& is also used in "pass by reference" in C++ (not C). Works like pointers but some people may consider easier to work with by reference instead of pointers:

Code:
#include <stdio.h>
void add(int &a, int b) {
   // adds a and b, and put result to
   // variable referenced by "a"
   a += b;
}
int main(int argc, char** argv) {
   int myval = 4;
   // myval references to "a" in add(), so a change
   // to either one modifies the same variable
   add(myval, 6);
   printf("%d\n", myval);    // should be 10
   return 0;
}


Last edited by cbkihong; 10-10-2002 at 12:26 AM..
 

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WWW::Mechanize::FormFiller::Value::Callback(3pm)	User Contributed Perl Documentation	  WWW::Mechanize::FormFiller::Value::Callback(3pm)

NAME
WWW::Mechanize::FormFiller::Value::Callback - Call Perl code to fill out a HTML form field SYNOPSIS
use WWW::Mechanize::FormFiller; use WWW::Mechanize::FormFiller::Value::Callback; my $f = WWW::Mechanize::FormFiller->new(); # Create a default value for the HTML field "login" # This will put the current login name into the login field sub find_login { getlogin || getpwuid($<) || "Kilroy"; }; my $login = WWW::Mechanize::FormFiller::Value::Callback->new( login => &find_login ); $f->add_value( login => $login ); # Alternatively take the following shorthand, which adds the # field to the list as well : # "If there is no password, put a nice number there my $password = $f->add_filler( password => Callback => sub { int rand(90) + 10 } ); DESCRIPTION
This class provides a way to write a value returned by Perl code into a HTML field. new NAME, CODE Creates a new value which will correspond to the HTML field "NAME". The "CODE" is a code reference that will return the value to be written into the HTML field. The code reference will be called with two parameters, the object and the HTML::Form::Input object. name [NEWNAME] Gets and sets the name of the HTML field this value corresponds to. value FIELD Returns the value to put into the HTML field. EXPORT None by default. COPYRIGHT AND LICENSE This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Copyright (C) 2002,2003 Max Maischein AUTHOR
Max Maischein, <corion@cpan.org> Please contact me if you find bugs or otherwise improve the module. More tests are also very welcome ! SEE ALSO
WWW::Mechanize, WWW::Mechanize::Shell, WWW::Mechanize::FormFiller, WWW::Mechanize::FormFiller::Value::Value, WWW::Mechanize::FormFiller::Value::Default, WWW::Mechanize::FormFiller::Value::Random, WWW::Mechanize::FormFiller::Value::Interactive perl v5.10.1 2009-04-24 WWW::Mechanize::FormFiller::Value::Callback(3pm)
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