Dab tsi yog tub nkeeg hauv C#?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

Tub nkeeg initialization yog ib tug txheej txheem uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws yuav tsum tau. Hauv lwm lo lus, pib ntawm qhov khoom tshwm sim tsuas yog ntawm kev thov. Nco ntsoov tias cov nqe lus tub nkeeg pib thiab tub nkeeg instantiation txhais tau tias tib yam-lawv tuaj yeem siv sib hloov.

Yog li ntawd, Lazy T xov puas nyab xeeb?

Xov - Muaj kev nyab xeeb Kev pib. Los ntawm lub neej ntawd, Tub nkeeg < T > cov khoom yog xov - nyab xeeb . Ntawd yog, yog tias tus neeg tsim khoom tsis qhia txog hom xov kev ruaj ntseg , cov Tub nkeeg < T > cov khoom nws tsim yog xov - nyab xeeb . Cov piv txwv hauv qab no qhia tau tias tib yam Tub nkeeg piv txwv muaj tib tus nqi rau peb cais xov.

Dab tsi yog tub nkeeg pib pib hauv C ++? Tub nkeeg pib pib yog ib qho ntawm cov qauv tsim uas siv hauv yuav luag txhua hom lus programming. Nws lub hom phiaj yog txav cov khoom siv mus rau hauv lub sijhawm. Nws yog qhov tshwj xeeb tshaj yog siv thaum tsim cov khoom kim heev, thiab koj xav kom ncua nws lig li sai tau, lossis tseem hla tag nrho.

Ces, vim li cas tub nkeeg pib?

Lazy pib ntawm ib yam khoom txhais tau hais tias nws cov creation yog ncua mus txog rau thaum nws yog thawj zaug siv. (Rau lub ncauj lus no, cov ntsiab lus tub nkeeg pib thiab tub nkeeg instantiation yog synonymous.) Lazy pib feem ntau yog siv los txhim kho kev ua tau zoo, zam kev suav tsis zoo, thiab txo cov kev xav tau ntawm kev nco.

Dab tsi yog tub nkeeg VAR hauv Swift?

Swift muaj ib tug mechanism tsim txoj cai rau hauv cov lus uas enables cia li-nyob rau hauv-lub sij hawm xam ntawm kev ua hauj lwm kim, thiab nws yog hu ua ib tug tub nkeeg variable . Cov no sib txawv yog tsim los siv ib tug muaj nuj nqi koj qhia tsuas yog thaum uas sib txawv thawj thov. Cov tub nkeeg cov cuab yeej raug cim raws li laj var.