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Deprecation is an attribute applied to a computer software feature, characteristic, or practice to indicate that it should be avoided (often because it is being superseded). Beyond describing software, the term is also used for a feature, design, or practice that is permitted but no longer recommended in other areas, such as word usage, hardware design, or compliance to building codes.
In mainstream English, the infinitive "to deprecate" means "to express disapproval of (something)". It derives from the Latin verb deprecare, meaning "to ward off (a disaster) by prayer". Thus, for one to state that a feature is deprecated is merely a recommendation against using it. It is still possible to produce a program or product without heeding the deprecation.
While a deprecated software feature remains in the software, its use may raise warning messages recommending alternative practices; deprecated status may also indicate the feature will be removed in the future. Features are deprecated rather than immediately removed, to provide backward compatibility and give programmers time to bring affected code into compliance with the new standard.
Among the most common reasons for deprecation are:
cifs. The latter provides better security, supports more protocol features, and integrates better with the rest of the kernel. Since the inclusion of
smbfshas been deprecated.
gets()is an example, because using this function can introduce a buffer overflow into the program that uses it. The Java API methods
.resumeare further examples.
FONTelement to allow page designers to specify the font in which text should be displayed. With the release of Cascading Style Sheets and HTML 4.0, the
FONTelement became extraneous, and detracted from the benefits of noting structural markup in HTML and graphical formatting in CSS. Thus, the
FONTelement was deprecated in the Transitional HTML 4.0 standard, and eliminated in the Strict variant.
An example in hardware design is omission of pull-up resistors on unused inputs to a logic gate. This practice may have been acceptable in the past, but becomes deprecated because faster clock speeds are likely to induce more transient noise on input lines, causing hardware glitches or malfunctions.
A building code example is the use of ungrounded ("2-prong") electrical receptacles. Over time, these older devices were deprecated in favor of the safer grounded ("3-prong") receptacles. The obsolete ungrounded receptacles were still permitted by "grandfathering" in existing electrical wiring, but became prohibited from new installations. Ungrounded receptacles are still available for legal purchase, but are intended solely for repairs to existing older electrical installations.
In writing and editing, usage of a word may be deprecated because it is ambiguous, confusing, or offensive to some readers. For example, the words sanction and inflammable may be misinterpreted because they have auto-antonymic or self-contradictory meanings; writing style guides often recommend substituting other words that are clearly understood and unambiguous. Some word usages that have acquired different connotations over time, such as gay or colored may be deprecated as obsolete in formal writing.
In standards, use of certain clause may be discouraged or superseded by new clauses. As an example, in IEEE 802.3-2012, Clause 5 (Layer Management) is "deprecated" by Clause 30 (Management), except for 5.2.4.
The term deprecated may also be used when a non-computer technical term becomes obsolete, either through change or superseding. An example in paleontology is the deprecated term Brontosaurus, the formerly popular name for the genus Apatosaurus. Examples from medicine include consumption (tuberculosis), grippe (influenza), and apoplexy (stroke).
Deprecated function: char * gets (char *s). ... The
getsfunction is very dangerous because it provides no protection against overflowing the string
s. The GNU library includes it for compatibility only. You should always use
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