我在網(wǎng)上找到一個(gè)用反射來做的select。感覺還不錯(cuò)，就是不知道效率如何

給個(gè)思路參考下：將多個(gè) channel 合并成一個(gè)，像這樣

package main

import (
    "fmt"
    "sync"
)

// 合并多個(gè) channel
func join_chan(cs []chan int) chan int {
    var wg sync.WaitGroup
    js := make(chan int, len(cs))
    for i := 0; i < len(cs); i++ {
        wg.Add(1)
        go func(index int) {
            for n := range cs[index] {
                js <- n
            }
            wg.Done()
        }(i)
    }

    // 當(dāng)所有輸入 channel 關(guān)閉時(shí)，自動(dòng)關(guān)閉輸出 channel
    go func() {
        wg.Wait()
        close(js)
    }()

    return js
}

func main() {
    cs := make([]chan int, 10)
    for i := 0; i < len(cs); i++ {
        cs[i] = make(chan int, 10)
    }

    sum := join_chan(cs)
    go func() {
        for i := 0; i < len(cs); i++ {
            cs[i] <- i
            close(cs[i])
        }
    }()

    for n := range sum {
        fmt.Printf("%d\n", n)
    }
}