C++26: Std:Is_mkati_moyo

\u003ch2\u003eC++26: Std:Is_within_lifetime\u003c/h2\u003e \u003cp\u003eNkhaniyi ili ndi zidziwitso zofunikira komanso zambiri pamutu wake, zomwe zikuthandizira kugawana chidziwitso ndi kumvetsetsa.\u003c/p\u003e \u003ch3\u003eNjira Zofunika Kwambiri\u003c/h3\u003e \u003cp\u003eOwerenga angayembekezere kupeza:\u003c/p\u003e \u003cul\u003e \u003cli\u003e Kumvetsetsa mozama nkhaniyo\u003c/li\u003e \u003cli\u003eMapulogalamu otheka komanso kufunikira kwenikweni\u003c/li\u003e \u003cli\u003e Malingaliro aukatswiri ndi kusanthula\u003c/li\u003e \u003cli\u003e Zomwe zasinthidwa pazomwe zikuchitika\u003c/li\u003e \u003c/ul\u003e \u003ch3\u003eValue Proposition\u003c/h3\u003e \u003cp\u003eZamkhalidwe ngati izi zimathandiza kukulitsa chidziwitso komanso kulimbikitsa kupanga zisankho mwanzeru m'madomeni osiyanasiyana.\u003c/p\u003e

Mafunso Ofunsidwa Kawirikawiri

Kodi std::is_within_lifetime ndi chifukwa chiyani idayambitsidwa mu C++26?

std::is_within_lifetime ndi njira yatsopano yophatikizira nthawi yomwe idayambika mu C++26 yomwe imatsimikizira ngati cholozera choperekedwa chikulozera ku chinthu chomwe chili mkati mwa moyo wake pachiwunikiridwa mosalekeza. Zinayambitsidwa kuti zithetse kusiyana kwa nthawi yayitali mu constexpr mapulogalamu, pomwe opanga analibe njira yotetezeka, yosunthika yodziwira zolozera zomwe zingakhale zolakwika panthawi ya computing-time computing, kupangitsa kuti constexpr ikhale yolimba komanso yofotokozera popanda kudalira khalidwe losadziwika.

Kodi std::is_within_lifetime imasiyana bwanji ndi macheke omwe alipo kale?

Mosiyana ndi macheke a nthawi yothamanga monga kufananitsa null pointer kapena zida zotsukira, std::is_within_lifetime imagwira ntchito mkati mwazomwe zimawunikidwa nthawi zonse. Si ntchito yothamanga - siyingatchulidwe mumtundu wamba wothamanga. Izi zimapangitsa kuti zikhale zosiyana kwambiri ndi zida monga AddressSanitizer, zomwe zimagwira ntchito polemba. Zimapatsa woyambitsayo mphamvu yoyankha mafunso amoyo wonse, kupanga constexpr punning yozikidwa pa mgwirizano ndi machitidwe ofananira pamapeto pake omveka bwino komanso osatheka.

Kodi std::is_within_lifetime imatsegula bwanji kwa opanga C++?

Mlandu waposachedwa kwambiri ndikukhazikitsa constexpr-yochezeka std::optional ndi std::variant popanda ma hacks. Madivelopa tsopano atha kuyang'ana mosamala ngati membala wokangalika mumgwirizano ali wovomerezeka pakuwunikidwa kwa nthawi. Kwa magulu omwe amamanga zida zamakono za C++, malaibulale, kapena mapulaneti - monga omwe akuphatikiza mayendedwe achitukuko kudzera ku Mewayz (ma module 207, kuyambira $19/mo) - izi zimachepetsa kuopsa kwa machitidwe osadziwika bwino kwambiri.

Kodi std::is_within_lifetime imathandizira pazophatikiza zonse zazikulu pamodzi ndi zina za C++26?

Kumayambiriro kwa chaka cha 2026, chithandizo cha compiler cha std::is_within_lifetime chikadalipobe. GCC ndi Clang ali ndi chithandizo choyesera C++26 chothandizidwa kudzera mu -std=c++26 mbendera, ndi kupezeka kwapang'ono. MSVC ikupitanso patsogolo kudzera mumsewu wake wa C++26. Madivelopa amalangizidwa kuti ayang'ane ma macros test macros (__cpp_lib_is_within_lifetime) musanagwiritse ntchito. Kukhalabe panopo ndi zosintha za toolchain ndikusamalira chilengedwe chanu cha dev - nsanja zina monga Mewayz streamline pama module awo 207 - zimakhala zofunikira.