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update: pointers log parser

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Inanc Gumus
2019-04-30 15:53:23 +03:00
parent 5038ca9e3b
commit 43120d65f9
1 changed files with 4 additions and 0 deletions
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4
26-pointers/02-pointers-basic-examples/main.go
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@ -43,6 +43,7 @@ func main() {
fmt.Println("\n••••• CHANGE IN: passPtrVal") fmt.Println("\n••••• CHANGE IN: passPtrVal")
passPtrVal(&counter) // same as passPtrVal(&counter) (no need to return) passPtrVal(&counter) // same as passPtrVal(&counter) (no need to return)
passPtrVal(&counter) // same as passPtrVal(&counter) (no need to return)
fmt.Printf("counter : %-16d address: %-16p\n", counter, &counter) fmt.Printf("counter : %-16d address: %-16p\n", counter, &counter)
} }
@ -53,6 +54,9 @@ func passPtrVal(pn *int) {
// pointers can breach function isolation borders // pointers can breach function isolation borders
*pn++ // counter changes because `pn` points to `counter` — (*pn)++ *pn++ // counter changes because `pn` points to `counter` — (*pn)++
fmt.Printf("pn : %-16p address: %-16p *pn: %d\n", pn, &pn, *pn) fmt.Printf("pn : %-16p address: %-16p *pn: %d\n", pn, &pn, *pn)
// setting it to nil doesn't effect the caller (the main function)
pn = nil
} }
// n is a int variable (copy of counter) // n is a int variable (copy of counter)