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Access a member of an object internal table line


Access a member of an object internal table line

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Access a member of an object internal table line
Tag : development , By : user107506
Date : September 13 2020, 09:00 AM


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In Moose, is it safe to access member variables directly through the object's internal hash?


Tag : perl , By : user186435
Date : March 29 2020, 07:55 AM
hop of those help? I would say it's never safe to break encapsulation, Moose or not.
Note that your bull test is not 100 times slower. Remember that it's using the accessor twice. Just on the back of the envelope, that takes it from 1,000,000 runs per second to 2,000,000 accesses per second. Compared to the hash, that makes it about a factor of 6. Add a bunch of those slowdowns and it can add up, though.
                      Rate  bull rocky natasha bull_counter rocky_counter natasha_x rocky_x bull_x natasha_counter rocky_direct bull_direct natasha_direct hash
bull              728177/s    --   -6%    -17%         -42%          -43%      -65%    -66%   -67%            -71%         -93%        -94%           -94% -95%
rocky             771011/s    6%    --    -12%         -39%          -39%      -63%    -64%   -65%            -70%         -93%        -93%           -94% -95%
natasha           877713/s   21%   14%      --         -30%          -31%      -58%    -59%   -60%            -66%         -92%        -92%           -93% -94%
bull_counter     1260308/s   73%   63%     44%           --           -1%      -40%    -42%   -42%            -51%         -88%        -89%           -89% -91%
rocky_counter    1274310/s   75%   65%     45%           1%            --      -39%    -41%   -42%            -50%         -88%        -89%           -89% -91%
natasha_x        2105717/s  189%  173%    140%          67%           65%        --     -3%    -4%            -17%         -81%        -81%           -82% -85%
rocky_x          2163925/s  197%  181%    147%          72%           70%        3%      --    -1%            -15%         -80%        -81%           -82% -85%
bull_x           2184533/s  200%  183%    149%          73%           71%        4%      1%     --            -14%         -80%        -80%           -82% -85%
natasha_counter  2548621/s  250%  231%    190%         102%          100%       21%     18%    17%              --         -77%        -77%           -79% -82%
rocky_direct    10901037/s 1397% 1314%   1142%         765%          755%      418%    404%   399%            328%           --         -3%            -9% -24%
bull_direct     11202734/s 1438% 1353%   1176%         789%          779%      432%    418%   413%            340%           3%          --            -6% -21%
natasha_direct  11939231/s 1540% 1449%   1260%         847%          837%      467%    452%   447%            368%          10%          7%             -- -16%
hash            14252488/s 1857% 1749%   1524%        1031%         1018%      577%    559%   552%            459%          31%         27%            19%   --
#!/Users/brian/bin/perls/perl5.14.2
use v5.10.1;
use strict;
use warnings;

use Benchmark qw/timethese cmpthese/;

package Bullwinkle {
    use strict;
    use warnings;
    use Moose;

    has 'x' => (is => 'rw', default => 0);

    # counter is also slow
    has 'counter' => (
        traits  => ['Counter'],
        is      => 'ro',
        isa     => 'Num',
        default => 0,
        handles => {
            inc_counter   => 'inc',
        },
    );
    }

package Rocky {
    use strict;
    use warnings;
    use Moose;

    has 'x' => (is => 'rw', default => 0);

    # counter is also slow
    has 'counter' => (
        traits  => ['Counter'],
        is      => 'ro',
        isa     => 'Num',
        default => 0,
        handles => {
            inc_counter   => 'inc',
        },
    );

    __PACKAGE__->meta->make_immutable;
    }

package Natasha {
    use strict;
    use warnings;

    sub new { bless { 'x' => 0 }, $_[0] }
    sub inc_counter { $_[0]->{x} += 1 }
    sub x           { 
        if( defined $_[1] ) { $_[0]->{x} = $_[1] }
        else                { $_[0]->{x} }
        }
    }

my $bull    = Bullwinkle->new;
my $rocky   = Rocky->new;
my $natasha = Natasha->new;

my $hash  = { 'x' => 0 };

cmpthese(-1,{ 
    bull          => sub { $bull->x(1 + $bull->x )   },
    bull_x        => sub { $bull->x                  },
    bull_direct   => sub { ++$bull->{'x'}            },
    bull_counter  => sub { $bull->inc_counter        },

    rocky         => sub { $rocky->x(1 + $rocky->x ) },
    rocky_x       => sub { $rocky->x                 },
    rocky_direct  => sub { ++$rocky->{'x'}           },
    rocky_counter => sub { $rocky->inc_counter       },

    natasha         => sub { $natasha->x(1 + $natasha->x ) },
    natasha_x       => sub { $natasha->x                   },
    natasha_direct  => sub { ++$natasha->{'x'}             },
    natasha_counter => sub { $natasha->inc_counter         },

    hash          => sub { ++$hash->{'x'}            },
});

Using an internal class to make a custom object, creating an array of that object, and access information in that object


Tag : java , By : unadopted
Date : March 29 2020, 07:55 AM
it should still fix some issue Code first questions later...
Word words = new Word[100];

Access a member function of an object that is a member variable of a parent class


Tag : php , By : rhyhann
Date : March 29 2020, 07:55 AM
This might help you Dont instantiate a seperate parent class, it will be instantiated as part of instantiating the child class.
Also pass the object to the child instantiation and create a __construct() method and pass the parameter on to it.
class Child extends Parent
{
    public __construct($var)
    {
        parent::__construct($var);
    }

    public function doStuff()
    {
        return parent::$object->objectFunction());
    }

}
public function control()
{
    //$parent = new Parent(new Object($variable));

    $child = new Child(new Object($variable)); // line 25
    $child->doStuff();
}

How to access a member of object whose member name (or path) is stored in a string? (angularjs)


Tag : angularjs , By : Bharath
Date : March 29 2020, 07:55 AM
To fix this issue Use Angular's $parse service
var getter = $parse(accessString);
var value = getter(obj);

C++ Can't access to object member while accessing the object holding this member


Tag : cpp , By : Tonix
Date : March 29 2020, 07:55 AM
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