Vim li cas rov qab const reference c++?

2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38

Koj xav xa rov qab daim ntawv pov thawj thaum koj xa cov khoom ntawm ib qho khoom, uas koj xav kom tsis txhob hloov kho sab nraud ntawm nws. Piv txwv li: thaum koj cov khoom muaj lub npe, koj tuaj yeem ua cov qauv hauv qab no const std::string& get_name{ rov qab lub npe; };.

Thaum twg koj yuav tsum siv const reference parameter?

Thaum dhau qhov kev sib cav los ntawm kev siv, ib txwm siv qhov kev siv const tshwj tsis yog koj yuav tsum hloov tus nqi ntawm qhov kev sib cav. Cov ntaub ntawv tsis-const tsis tuaj yeem khi rau r-tus nqi. Kev ua haujlwm nrog cov ntaub ntawv tsis yog const tsis tuaj yeem hu nrog cov ntawv sau lossis ib ntus.

Thaum twg koj yuav tsum rov qab los ntawm kev siv?

Kev dhau los ntawm kev siv txhais tau tias dhau qhov kev siv rau ib yam khoom uas twb muaj lawm. Yog li, yog tias koj xav xa rov qab cov ntaub ntawv siv hauv ib qho kev ua haujlwm, nws txhais tau tias koj yuav tsum tsim cov khoom ntawd hauv kev ua haujlwm Koj paub tias lub luag haujlwm tuaj yeem tsim cov khoom tshiab hauv ob txoj hauv kev: Ntawm qhov pawg los yog heap.

Cov ntaub ntawv pov thawj ua li cas?

yog tias koj siv const reference, koj dhau los ntawm kev siv thiab cov ntaub ntawv qub tsis tau theej. nyob rau hauv ob qho tib si, cov ntaub ntawv qub tsis tuaj yeem hloov kho los ntawm sab hauv lub luag haujlwm.

txhais li cas yog tias xa rov qab siv?

Nws txhais tau tias koj rov qab los ntawm kev siv, uas yog, yam tsawg kawg ntawm qhov no, tej zaum tsis xav tau. Nws yeej txhais tau tias tus nqi xa rov qab yog tus alias rau txhua yam koj rov qab los ntawm kev ua haujlwm. Tshwj tsis yog tias nws tsis yog qhov khoom tsis tu ncua nws tsis raug cai.