Compiler optimization in the C++ programming language eliminating unnecessary copying of objects
In C++ computer programming, copy elision refers to a compiler optimization technique that eliminates unnecessary copying of objects.
The C++ language standard generally allows implementations to perform any optimization, provided the resulting program's observable behavior is the same as if, i.e. pretending, the program were executed exactly as mandated by the standard. Beyond that, the standard also describes a few situations where copying can be eliminated even if this would alter the program's behavior, the most common being the return value optimization (see below). Another widely implemented optimization, described in the C++ standard, is when a temporary object of class type is copied to an object of the same type.[1][2] As a result, copy-initialization is usually equivalent to direct-initialization in terms of performance, but not in semantics; copy-initialization still requires an accessible copy constructor.[3] The optimization can not be applied to a temporary object that has been bound to a reference.
^ISO/IEC (2003). ISO/IEC 14882:2003(E): Programming Languages - C++ §12.8 Copying class objects [class.copy] para. 15
^ISO/IEC (2003). "§ 12.8 Copying class objects [class.copy]". ISO/IEC 14882:2003(E): Programming Languages - C++(PDF). para. 15. Archived from the original (PDF) on 2023-04-10. Retrieved 2024-02-26.
^Sutter, Herb (2001). More Exceptional C++. Addison-Wesley.
In C++ computer programming, copyelision refers to a compiler optimization technique that eliminates unnecessary copying of objects. The C++ language...
Copy Elision". Jonas Devlieghere. Retrieved 2021-01-17. Note, however, the caveats covered in Brand, C++ (2018-12-11). "Guaranteed CopyElision Does Not...
sub expressions—require that copy propagation be run afterwards in order to achieve an increase in efficiency. Copyelision Constant folding and constant...
opposite process, where one or more sounds are removed, is referred to as elision. Epenthesis arises for a variety of reasons. The phonotactics of a given...
particularly in vernacular Belfast speech. Elision of /d/ in hand [ˈhɑːn], candle [ˈkanl] and old [ˈəʉl], etc. Elision of /b, ɡ/ in sing [ˈsɪŋ], thimble, finger...
indicated by the spellings oo and ou, as in moon and soup. Yod-dropping is the elision of the /j/ from certain syllable-initial clusters of the type described...
Richard Brody of The New Yorker felt that the film is "of shortcuts and elisions no less relentless than those of American superhero or superstar vehicles...
Broadcast Signal Intrusion – with all its ambiguities, ellipses and poetic elisions – is both unique and rewarding, if only for a more discerning audience...
the replacement of apostrophes with hyphens in some cases of (potential) elision in 1935. grand'mère → grand-mère (grandmother) Since the 1970s, though...
information about source files with a relative pathname (after source prefix elision). Absolute paths are usually system header files and coverage of any inline...
distinguish the vowels, and so does the Codex Regius copy. However, the 13th-century Codex Regius copy of the Poetic Edda probably relied on newer or poorer...
> /katai/ [katai] In both words, the medial velar -k- became silent by elision. A number of archaic grammatical forms were lost and made the language...
simpler words, and has a script whose orthography is slightly imperfect (a-elision) and separates words by spaces. Thus evolved Gujarati words are less a...
vibāgaya "exam" < Sanskrit vibhāga) or as a result of sandhi, either after elision of intervocalic consonants (e.g. dānavā "to put" < damanavā) or in originally...
transliterated with an apostrophe) is a Sanskrit punctuation mark for the elision of a vowel in sandhi: एकोऽयम् eko'yam ( ← एकस् ekas + अयम् ayam) ("this...
of sound segments in the field of linguistics is known as "elision". Other types of elision include the processes of apheresis, syncope, apocope, synizesis...
irregular verbs have developed in the spoken language as a result of the elision of sonorants in some verbs of the Type III class (with subsequent vowel...
(audio and video) Davidson, Robert. "Short Biography of Terry Riley." 1999. Elision Fields, Riley's management and CD label A Concert in Honor of Terry Riley...
(1980:33, 36) "Archived copy". Archived from the original on 2011-07-21. Retrieved 2009-08-14.{{cite web}}: CS1 maint: archived copy as title (link) Vago...
this can reduce how often the collector needs to run. Synchronization elision. If an object is found to be accessible from one thread only, operations...
(conjugation morphology passé composé passé simple) Orthography Alphabet Reforms Circumflex Braille Phonology Elision Liaison Aspirated h Help:IPA/French v t e...
mutation, prefixes, clitics, suffixes, root inflection, ending morphology, elision, sandhi, epenthesis, and assimilation; the beginning, core, and end of...
ghazal ("Flower", where he uses Qawwali vocal techniques such as vocal elisions and warbling). Malik possesses a wide tenor vocal range and is known for...
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