Why would a new[] expression ever invoke a destructor?About constructors/destructors and new/delete operators in C++ for custom objectsDoes delete call the destructor?Overloading operator delete in a base classWhen is %destructor invoked in BISON?Why should C++ programmers minimize use of 'new'?Why is ::operator new[] necessary when ::operator new is enough?Why am I permitted to declare an object with a deleted destructor?Does delete[] deallocate memory in one shot after invoking destructors?Why are non-placement `new` and `delete` built into the language and not just regular functions?Why deallocation function is not called when object constructor throw in a new expression?

Recommended PCB layout understanding - ADM2572 datasheet

Mixing PEX brands

How do apertures which seem too large to physically fit work?

Strong empirical falsification of quantum mechanics based on vacuum energy density

What are some good ways to treat frozen vegetables such that they behave like fresh vegetables when stir frying them?

Why is this estimator biased?

It grows, but water kills it

Are Captain Marvel's powers affected by Thanos' actions in Infinity War

Biological Blimps: Propulsion

Why does a simple loop result in ASYNC_NETWORK_IO waits?

How can I write humor as character trait?

Invalid date error by date command

Mimic lecturing on blackboard, facing audience

Why would a new[] expression ever invoke a destructor?

Why is the "ls" command showing permissions of files in a FAT32 partition?

Novel, Lo Tech SF/Fantasy

The IT department bottlenecks progress, how should I handle this?

Fear of getting stuck on one programming language / technology that is not used in my country

How to say when an application is taking the half of your screen on a computer

Does the UK parliament need to pass secondary legislation to accept the Article 50 extension

Open a doc from terminal, but not by its name

Can I still be respawned if I die by falling off the map?

How can mimic phobia be cured?

How do I delete all blank lines in a buffer?



Why would a new[] expression ever invoke a destructor?


About constructors/destructors and new/delete operators in C++ for custom objectsDoes delete call the destructor?Overloading operator delete in a base classWhen is %destructor invoked in BISON?Why should C++ programmers minimize use of 'new'?Why is ::operator new[] necessary when ::operator new is enough?Why am I permitted to declare an object with a deleted destructor?Does delete[] deallocate memory in one shot after invoking destructors?Why are non-placement `new` and `delete` built into the language and not just regular functions?Why deallocation function is not called when object constructor throw in a new expression?













9















From the C++17 standard (draft here), [expr.new]:




If the new-expression creates an object or an array of objects of class type, access and ambiguity control are done for the allocation function, the deallocation function, and the constructor. If the new-expression creates an array of objects of class type, the destructor is potentially invoked.




Why would new[] invoke a destructor? It's new, after all. It isn't delete.






c++ c++17 new-operator







share|improve this question




























    9















    From the C++17 standard (draft here), [expr.new]:




    If the new-expression creates an object or an array of objects of class type, access and ambiguity control are done for the allocation function, the deallocation function, and the constructor. If the new-expression creates an array of objects of class type, the destructor is potentially invoked.




    Why would new[] invoke a destructor? It's new, after all. It isn't delete.






    c++ c++17 new-operator







    share|improve this question


























      9












      9








      9








      From the C++17 standard (draft here), [expr.new]:




      If the new-expression creates an object or an array of objects of class type, access and ambiguity control are done for the allocation function, the deallocation function, and the constructor. If the new-expression creates an array of objects of class type, the destructor is potentially invoked.




      Why would new[] invoke a destructor? It's new, after all. It isn't delete.






      c++ c++17 new-operator







      share|improve this question
















      From the C++17 standard (draft here), [expr.new]:




      If the new-expression creates an object or an array of objects of class type, access and ambiguity control are done for the allocation function, the deallocation function, and the constructor. If the new-expression creates an array of objects of class type, the destructor is potentially invoked.




      Why would new[] invoke a destructor? It's new, after all. It isn't delete.






      c++ c++17 new-operator




      c++ c++17 new-operator






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago









      Cody Gray♦

      195k35382470




      195k35382470










      asked 2 hours ago









      thbthb

      8,67432355




      8,67432355






















          1 Answer
          1






          active

          oldest

          votes


















          16














          If construction of any object in the buffer throws an exception, the previously constructed objects must be destructed. That requires an available destructor.






          share|improve this answer
























            Your Answer






            StackExchange.ifUsing("editor", function ()
            StackExchange.using("externalEditor", function ()
            StackExchange.using("snippets", function ()
            StackExchange.snippets.init();
            );
            );
            , "code-snippets");

            StackExchange.ready(function()
            var channelOptions =
            tags: "".split(" "),
            id: "1"
            ;
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function()
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled)
            StackExchange.using("snippets", function()
            createEditor();
            );

            else
            createEditor();

            );

            function createEditor()
            StackExchange.prepareEditor(
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: true,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: 10,
            bindNavPrevention: true,
            postfix: "",
            imageUploader:
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            ,
            onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            );



            );













            draft saved

            draft discarded


















            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55307381%2fwhy-would-a-new-expression-ever-invoke-a-destructor%23new-answer', 'question_page');

            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            16














            If construction of any object in the buffer throws an exception, the previously constructed objects must be destructed. That requires an available destructor.






            share|improve this answer





























              16














              If construction of any object in the buffer throws an exception, the previously constructed objects must be destructed. That requires an available destructor.






              share|improve this answer



























                16












                16








                16







                If construction of any object in the buffer throws an exception, the previously constructed objects must be destructed. That requires an available destructor.






                share|improve this answer















                If construction of any object in the buffer throws an exception, the previously constructed objects must be destructed. That requires an available destructor.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 2 hours ago









                Sombrero Chicken

                24.4k33281




                24.4k33281










                answered 2 hours ago









                StoryTellerStoryTeller

                103k12215280




                103k12215280





























                    draft saved

                    draft discarded
















































                    Thanks for contributing an answer to Stack Overflow!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid …


                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.

                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function ()
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55307381%2fwhy-would-a-new-expression-ever-invoke-a-destructor%23new-answer', 'question_page');

                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    -

                    Popular posts from this blog

                    strTok function (thread safe, supports empty tokens, doesn't change string)String case reverse function in CGet line from string functionTDD: String Calculator KataC - K&R getint() variationSimple function to generate an HTML-safe stringGeneric Pairing Heap PerformancePattern for writing a generic string transformation functionChange a string into a function/def activatorC++ string tokenizing without streams, with certain conditionsRead consecutive blanks in array

                    Image
                    What are these boxed doors outside store fronts in New York? RSA: Danger of using p to create q Theorems that impeded progress strTok function (thread safe, supports empty tokens, doesn't change string) What typically incentivizes a professor to change jobs to a lower ranking university? Accidentally leaked the solution to an assignment, what to do now? (I'm the prof) I'm flying to France today and my passport expires in less than 2 months Watching something be written to a file live with tail Alternative to sending password over mail? Today is the Center Why "Having chlorophyll without photosynthesis is actually very dangerous" and "like living with a bomb"? Languages that we cannot (dis)prove to be Context-Free Did Shadowfax go to Valinor? How is it possible to have an ability score that is less than 3? Is it tax fraud for an individual to declare non-taxable revenue as taxable income? (US tax laws) Why is 150k or 200k job...
                    Read more

                    How to write “ä” and other umlauts and accented letters in bibliography?Accents in BibTeXSorting references with special characters alphabeticallyUse ae ligature in bibliographyEastern European nameInverted circumflex in BibTexBibTex, non-ascii initials and nameptr fproblems with accent in LatexHow to add a Ø to my bibliography from Jabref?References without accentsTroubles when trying to cite St“omer-Verlet in ”title" field of a bib entryComprehensive list of accented charactersHow to type the letter “i” with two dots (diaeresis) in math mode?Problem with glossary text and accented lettersSpecial character in bibliographyAccented letters, Unicode and LaTeX accentsHow to stop natbib from modifying bibliography styleCitation of a paper with non-standard characters by BibtexWrite accented characters to file using writeHow to group the bibliography alphabetically, if some surnames start with “accented” characters?How can I automatically capitalize significant words in my bibliography?

                    Image
                    Information to fellow intern about Hiring? Are tax years 2016 & 2017 back taxes deductible for tax year 2018? Why a const reference doesn't extend the life of temporary object passed via function? Why did the Germans forbid the possession of pet pigeons in Rostov-on-Don in 1941? I see my dog run How to avoid repetitive long generic constraints in Rust How can I fix this gap between bookcases I made? What are these boxed doors outside store fronts in New York? How would photo IDs work for shapeshifters? What does "enim et" mean? What is the meaning of "of trouble" in the following sentence? How to determine if window is maximised or minimised from bash script Calculate Levenshtein distance between two strings in Python Why do we use polarized capacitors? How to answer pointed "are you quitting" questioning when I don't want them to suspect Extreme, but not acceptable situation and I can't start the work tomorrow...
                    Read more

                    Title of papers that have not been submitted to a venue?How “submitted”, “to appear”, “accepted” papers are evaluated in a CV?What percentage of papers submitted to a conference or journal have been previously rejected in the same or another venue?How to automatically extract submitted/accepted dates of many journal papers?Is it okay/common/good to mention the submitted papers in my phd thesis?Can one determine whether somebody's work may have been plagiarized?How to describe a paper for which you have not yet submitted revisions in CV?JCR publication required to enrol in PhD program - is it common?“Full” versions versus “Preliminary” version of result/paper. Are they considered different?How can I prove that my article has not been submitted to another journal?Is there anything that has been tried to stop publication shopping

                    Image
                    Can I write a for loop that iterates over both collections and arrays? Is it possible for the two major parties in the UK to form a coalition with each other instead of a much smaller party? What is the command to reset a Windows installation without deleting any files How to answer pointed "are you quitting" questioning when I don't want them to suspect Can I legally use front facing blue light in the UK? Is "plugging out" electronic devices an American expression? Why is the design of haulage companies so “special”? What is the steepest angle that a canal can be traversable without locks? Patience, young "Padovan" Is this food a bread or a loaf? Geography at the pixel level Symbol above others Springs with some finite mass Why do UK politicians seemingly ignore opinion polls on Brexit? Is there a name of the flying bionic bird? What does 'script /dev/null' do? Is std::next for vector O(n) or O(1)? Are cabin d...
                    Read more