Video: Cov chav kawm twg tuaj yeem muaj cov tswvcuab ua haujlwm yam tsis muaj kev siv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov chav kawm twg tuaj yeem muaj cov tswvcuab ua haujlwm yam tsis muaj lawv ua ? Kev piav qhia: Abstract cov chav kawm tuaj yeem muaj cov tswv cuab ua haujlwm nrog tsis muaj kev siv , qhov twg tus yuav tsum tau txais cov subclasses siv cov muaj nuj nqi.
Tsuas yog li ntawd, cov tswv cuab ua haujlwm twg tsis xav tau hom rov qab?
Cov Tswv Cuab Ua Haujlwm Rov Qab Hom . Ib tsoom pej xeem kev ua tswv cuab yuav tsum tsis txhob rov qab los ib tug non-const reference los yog pointer rau tus tswv cuab cov ntaub ntawv. Ib tsoom pej xeem kev ua tswv cuab yuav tsum tsis txhob rov qab los ib tug non-const reference los yog pointer rau cov ntaub ntawv sab nraum ib object, tshwj tsis yog cov khoom qhia cov ntaub ntawv nrog rau lwm yam khoom.
yog ib tug tswv cuab muaj nuj nqi uas tau txais hu ua thaum ib chav kawm khoom? Ib tug constructor yog ib tug tshwj xeeb kev ua tswv cuab ntawm a chav kawm nws lub hom phiaj feem ntau yog los pib qhov cov tswv cuab ntawm ib khoom . Ib tug constructor yog ib muaj nuj nqi , thiab koj tuaj yeem txhais nws ua txhua yam koj xav tau. Txawm li cas los xij, koj tsis qhia meej txog tus tsim muaj nuj nqi . Nws yog cia li hu thaum koj tshaj tawm ib khoom.
Ib sab saum toj no, cov tswv cuab twg tsis tuaj yeem nkag los ntawm cov chav kawm qub?
Piav: Tus kheej tus tswv cuab muaj nuj nqi tsis tuaj yeem nkag mus nyob rau hauv derived chav kawm . Cov nkag mus cov neeg qhia yog ntawm kev ruaj ntseg siab tshaj plaws uas tso cai rau tsuas yog cov cov tswv cuab ntawm tus kheej chav kawm rau nkag mus tus kheej tus tswv cuab muaj nuj nqi. 4.
Cov tswv cuab pej xeem siv tau li cas rau koj chav kawm?
Kev piav qhia: Cov tswv cuab pej xeem tuaj yeem yog nkag mus nyob qhov twg hauv tus program siv tus khoom ntawm chav kawm . Thiab yog siv tus taw tes taw qhia, ces tus neeg teb xov tooj xub siv los nkag mus rau cov tub kawm . Yog tias cov khoom ib txwm siv nrog tus neeg teb xov tooj, qhov yuam kev yuav raug tsim.
Pom zoo:
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