Slots in Python: A way to prevent the dynamical creation of attributes and to save memory space in certain cases. "Multiple Inheritance (object-oriented programming) was widely supposed to be very difficult to implement efficiently. For example. Betty Boop slots. Video slot made by Bally Technologies. How about this for something a bit different? Betty Boop is a slot game that includes some of the most.
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The attributes of the instances are capable of sharing part of their internal storage between each other, i. Slots are a nice way to work around this space consumption problem. Given a list of arguments, a list of applicable methods is determined. However, in most implementations, it can still inherit from each superclass only once, and thus, does not support cases in which a student has two jobs or attends two institutions. This kind of behavior, however, can be achieved with the decorator pattern. Any slot can be accessed using the slot-value function or via optionally auto-generated accessor methods.
Common Lisp Object System
Features[ edit ] The basic building blocks of CLOS are classes and their methods , instances of those classes, and generic functions. CLOS provides macros to define those: Instances are created with the function make-instance. Slots can be allocated by class all instances of a class share the slot or by instance.
Each slot has a name and the value of a slot can be accessed by that name using the function slot-value. Additionally special generic functions can be defined to write or read values of slots. Each slot in a CLOS class must have a unique name. CLOS is a multiple dispatch system. This means that methods can be specialized upon any or all of their required arguments. Most OO languages are single-dispatch, meaning that methods are only specialized on the first argument.
Another unusual feature is that methods do not "belong" to classes; classes do not provide a namespace for generic functions or methods. Methods are defined separately from classes, and they have no special access e.
Methods in CLOS are grouped into generic functions. A generic function is an object which is callable like a function and which associates a collection of methods with a shared name and argument structure, each specialized for different arguments.
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Method overriding Illustration of method overriding Many object-oriented programming languages permit a class or object to replace the implementation of an aspect—typically a behavior—that it has inherited. This process is usually called overriding. Overriding introduces a complication: The answer varies between programming languages, and some languages provide the ability to indicate that a particular behavior is not to be overridden and should behave as defined by the base class.
For instance, in C , the base method or property can only be overridden in a subclass if it is marked with the virtual, abstract, or override modifier. Code reuse[ edit ] Implementation inheritance is the mechanism whereby a subclass re-uses code in a base class. By default the subclass retains all of the operations of the base class, but the subclass may override some or all operations, replacing the base-class implementation with its own. The base class comprises operations to compute the sum of the squares between two integers.
The subclass re-uses all of the functionality of the base class with the exception of the operation that transforms a number into its square, replacing it with an operation that transforms a number into its square and cube respectively.
An alternative technique, explicit delegation , requires more programming effort, but avoids the substitutability issue. Whereas public inheritance represents an " is-a " relationship and delegation represents a " has-a " relationship, private and protected inheritance can be thought of as an "is implemented in terms of" relationship.
The parent class can be a combination of implemented operations and operations that are to be implemented in the child classes.
What are the benefits of multi-core processors? Intel multi-core processors provide greater processing resources. Two physical CPU sockets Dual-core: Each CPU package has exactly two processor cores Quad-core: Each CPU package has exactly four processor cores Six-core: Each CPU package has exactly six processor cores Eight-core: Each CPU package has exactly eight processor cores Multi-core: Intel Turbo Boost Technology 2.
This results in increased performance of both single and multi-threaded applications. How much faster will the processor run with Intel Turbo Boost 2. The maximum frequency of Intel Turbo Boost 2. The amount of time the processor spends in the Intel Turbo Boost 2. Any of the following can set the upper limit of Intel Turbo Boost 2. Number of active cores Estimated power consumption Processor temperature When the processor is operating below these limits and the user's workload demands additional performance, the processor frequency will dynamically increase until the upper limit of frequency is reached.
Intel Turbo Boost 2. Why did HP choose to implement Liquid Cooling? HP places a large priority on satisfying customer requirements. Achieving the lowest acoustics levels is a priority for HP Workstations. Implementing Liquid Cooling provides extremely efficient heat removal from the processors, allowing the remaining system fans to run at greatly reduced RPMs, which reduces the overall acoustic output levels.
Configurations where the processor fans are not the dominant noise source will not significantly benefit from Liquid Cooling. Examples of possible configurations where processor fans are not the dominant noise source are memory configurations where all memory slots are filled or configurations with 15K SAS drives.