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Is there any class pointers in Perl in order to access member variables and functions?


By : Combobreaker
Date : August 01 2020, 01:00 PM
To fix the issue you can do I'm looking to build a Node class in Perl (using the keyword 'package'), but I'm not sure how to create a pointer to class variable like in C++.
code :
package Node;

use strict;
use warnings qw( all );

use Carp qw( croak );

sub new  {
   my ($class, %args) = @_;

   croak("key is required") if !exists($args{key});

   my $self = bless({}, $class);

   $self->{ key   } = $args{ key   };
   $self->{ left  } = $args{ left  };
   $self->{ right } = $args{ right };

   return $self;
}

sub key   { my $self = shift; $self->{ key   } = shift if @_; $self->{ key   } }
sub left  { my $self = shift; $self->{ left  } = shift if @_; $self->{ left  } }
sub right { my $self = shift; $self->{ right } = shift if @_; $self->{ right } }

1;
package Node;

use strict;
use warnings qw( all );

use Moo;

use namespace::clean;

has key   => ( is => 'rw', required => 1 );
has left  => ( is => 'rw' );
has right => ( is => 'rw' );

1;
my $node = Node->new(
   key   => $key,
   left  => $left,    # Optional. Defaults to undef.
   right => $right,   # Optional. Defaults to undef.
);


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C++ - How to access member variables/functions from a pointer to a class


By : Grishma
Date : March 29 2020, 07:55 AM
To fix this issue There are two ways to get things out of pointers.
The first is to dereference it:
code :
string_node &mynode = *cursor;
mynode.whatever;
cursor->whatever;

How do I access member variables from one class into other using friend functions in C++?


By : El Huevo
Date : March 29 2020, 07:55 AM
I wish this helpful for you There are few problems with your code, and they are all located in this function:
code :
void store_keeper::stock_mgmt(store &s)
                                     ^ ~~~~~~ 1
{
    for(int k=0;k<s.num_Of_Items;k++)
    {             ^^^^^^^^^^^^^^~~~~~~~~~~~~~ 2 
        if(s.items[k].stock_In_Hand<10)
        {  ^^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3
            s.items[k].print();
        }   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4
    }
}

How to declare pointers to member functions in a class initializer and call through those pointers?


By : Antony Selvam
Date : March 29 2020, 07:55 AM
around this issue One way would be to initialize _requests in the constructor initializer list of tlv so that there will be a this pointer that you can bind. I also recommend using a lambda function instead of std::bind because they are typically faster.
code :
tlv () :
    _requests{
        {tlv_type_read,  [this](const TLV_RECORD& Record){ return parse_read(Record); }},
        {tlv_type_write, [this](const TLV_RECORD& Record){ return parse_write(Record); }}
    }
{
}

uint32_t start_parse (const TLV_RECORD& Record)
{
    pTLV_PARSER parser = _requests[0].parse_routine;
    parser (Record);
    return 0;
};

const TABLE _requests [2];

How to access public variables from within their own class's member functions? (C++)


By : ประวัติ อินทร์ชัยยา
Date : March 29 2020, 07:55 AM
hop of those help? You mean to have Goban::printBoard and Goban::playMove. As it is, you are simply declaring + defining free functions.
e.g.
code :
void Goban::printBoard() 
{
}
Goban::Goban()
{
}

Member Variables and Functions through this pointers


By : HONGZHE YU
Date : March 29 2020, 07:55 AM
it should still fix some issue Your String class cannot be used to build a program upon, due to the faults within the String class. You must fix those errors first before even thinking about using String as a string class.
Therefore this answer addresses how to fix String first -- from there, you should now be able to write the program knowing you're not working on a faulty foundation.
code :
int main()
{
   String s;
} // <-- destructor of s may crash
class String
{
   public:
     String() : sptr(nullptr) {}
   //...
};
if(this != &other)
{
    String tmp( other );   
    std::swap(tmp.sptr, sptr);
}
return *this;
String& operator=( const String& other ) // <-- note the return type is String&
{
  //... code
  //...
  return *this;
}
~String() 
{ 
   delete [] sptr;
}
String a2("Hello ");   
a2.display();
a2 = "Java ";
a2.display();
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