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スターティングGO言語: スライス拡張 p175
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package main | |
import ( | |
"fmt" | |
) | |
func main() { | |
/* A */ | |
a := [3]int{1, 2, 3} // s == [1,2,3] | |
s := a[:] | |
fmt.Println(len(s)) // == 3 | |
fmt.Println(cap(s)) // == 3 | |
fmt.Println(a) // [1,2,3] | |
fmt.Println(s) // [1,2,3] | |
/* B */ | |
s[0] = 8 | |
fmt.Println(a) // [8,2,3] | |
fmt.Println(s) // [8,2,3] | |
a[0] = 10 | |
fmt.Println(a) // [10,2,3] | |
fmt.Println(s) // [10,2,3] | |
/* C */ | |
// 容量が拡張されるとsはaの領域ではなくなる | |
s = append(s, 4) // a == [10,2,3], s == [10,2,3,4] | |
fmt.Println(a) // [10,2,3] | |
fmt.Println(s) // [10,2,3,4] | |
fmt.Println(len(s)) // == 4 | |
fmt.Println(cap(s)) // == 8 | |
a[0] = 9 | |
fmt.Println(a) // [9,2,3] | |
fmt.Println(s) // [1,2,3,4] | |
} |
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