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  2. Read-copy-update - Wikipedia

    en.wikipedia.org/wiki/Read-copy-update

    Read-copy-update insertion procedure. A thread allocates a structure with three fields, then sets the global pointer gptr to point to this structure.. A key property of RCU is that readers can access a data structure even when it is in the process of being updated: RCU updaters cannot block readers or force them to retry their accesses.

  3. Associative array - Wikipedia

    en.wikipedia.org/wiki/Associative_array

    add a new (,) pair to the collection, mapping the key to its new value. Any existing mapping is overwritten. The arguments to this operation are the key and the value. Remove or delete remove a (,) pair from the collection, unmapping a given key from its value. The argument to this operation is the key.

  4. Slowly changing dimension - Wikipedia

    en.wikipedia.org/wiki/Slowly_changing_dimension

    Having a Type 2 surrogate key for each time slice can cause problems if the dimension is subject to change. [1] A pure Type 6 implementation does not use this, but uses a surrogate key for each master data item (e.g. each unique supplier has a single surrogate key). This avoids any changes in the master data having an impact on the existing ...

  5. Method overriding - Wikipedia

    en.wikipedia.org/wiki/Method_overriding

    The implementation in the subclass overrides (replaces) the implementation in the superclass by providing a method that has same name, same parameters or signature, and same return type as the method in the parent class. [2] The version of a method that is executed will be determined by the object that is used to invoke it.

  6. Compose and send emails in AOL Mail

    help.aol.com/articles/aol-mail-compose-and-contacts

    1. From the inbox, click Compose. 2. In the "To" field, type the name or email address of your contact. 3. In the "Subject" field, type a brief summary of the email.

  7. Immutable object - Wikipedia

    en.wikipedia.org/wiki/Immutable_object

    In object-oriented (OO) and functional programming, an immutable object (unchangeable [1] object) is an object whose state cannot be modified after it is created. [2] This is in contrast to a mutable object (changeable object), which can be modified after it is created. [3]

  8. Update AOL Mail settings

    help.aol.com/articles/aol-mail-mail-settings

    Update the Block Senders list. Take control of your inbox by keeping your spam list up to date. 1. Click the Block Senders tab. 2. In the box under "Block mail from ...

  9. Inheritance (object-oriented programming) - Wikipedia

    en.wikipedia.org/wiki/Inheritance_(object...

    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, while in programming languages such as Java, different methods can be called to override other methods. [15] An alternative to overriding is hiding the inherited code.