我在結(jié)構(gòu)中有一個地圖：type Neighborhood struct { rebuilt map[uint32][3]uint32 // Facet index vs {neighbor0, neighbor1, neighbor2}}我初始化地圖： n := &Neighborhood{ rebuilt: make(map[uint32][3]uint32, 9348), } // Populate neighbors with default of UINT32_MAX for i := uint32(0); i < 9348; i++ { n.rebuilt[i] = [3]uint32{math.MaxUint32, math.MaxUint32, math.MaxUint32} }稍后需要更新地圖，但這不起作用： nbrs0 := n.rebuilt[4] nbrs1 := n.rebuilt[0] nbrs0[2] = 0 nbrs1[1] = 4地圖實際上并未使用上述賦值語句進行更新。我錯過了什么？
2 回答
明月笑刀無情
TA貢獻1828條經(jīng)驗 獲得超4個贊
您需要再次將數(shù)組分配給映射。
nbrs0 := n.rebuilt[4] nbrs1 := n.rebuilt[0] nbrs0[2] = 0 nbrs1[1] = 4 n.rebuilt[4] = nrbs0 n.rebuilt[0] = nrbs1
當(dāng)您分配給 您時，請制作原始數(shù)組的副本。因此，更改不會傳播到 map，您需要使用新數(shù)組顯式更新映射。nbrsN
肥皂起泡泡
TA貢獻1829條經(jīng)驗 獲得超6個贊
您需要將值重新分配給地圖條目...
package main
import (
"fmt"
"math"
)
type Neighborhood struct {
rebuilt map[uint32][3]uint32 // Facet index vs {neighbor0, neighbor1, neighbor2}
}
func main() {
n := &Neighborhood{
rebuilt: make(map[uint32][3]uint32, 9348),
}
// Populate neighbors with default of UINT32_MAX
for i := uint32(0); i < 3; i++ {
n.rebuilt[i] = [3]uint32{math.MaxUint32, math.MaxUint32, math.MaxUint32}
}
v := n.rebuilt[1]
v[1] = uint32(0)
fmt.Printf("%v\n", v)
fmt.Printf("%v\n", n)
n.rebuilt[1] = v
fmt.Printf("%v\n", n)
}
https://play.golang.org/p/Hk5PRZlHUYc
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