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CyberLight/main.go

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Revisions

  1. CyberLight revised this gist Jan 16, 2016. No changes.
  2. CyberLight created this gist Jan 16, 2016.
    78 changes: 78 additions & 0 deletions main.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,78 @@
    package main

    import (
    redis "gopkg.in/redis.v3"
    "reflect"
    "unsafe"
    "fmt"
    )

    type A struct {
    val string
    }

    func (a *A) Val() string {
    return a.val
    }

    type B struct {
    val []string
    }

    func (b *B) Val() []string {
    return b.val
    }

    func change_val(f *A, v string) {
    pointerVal := reflect.ValueOf(f)
    val := reflect.Indirect(pointerVal)
    member := val.FieldByName("val")
    ptrToY := unsafe.Pointer(member.UnsafeAddr())
    realPtrToY := (*string)(ptrToY)
    *realPtrToY = v
    }

    func change_b_val(f *B, v []string) {
    pointerVal := reflect.ValueOf(f)
    val := reflect.Indirect(pointerVal)
    member := val.FieldByName("val")
    ptrToY := unsafe.Pointer(member.UnsafeAddr())
    realPtrToY := (*[]string)(ptrToY)
    *realPtrToY = v
    }

    func change_redis_val(f *redis.StringCmd, v string) {
    pointerVal := reflect.ValueOf(f)
    val := reflect.Indirect(pointerVal)
    member := val.FieldByName("val")
    ptrToY := unsafe.Pointer(member.UnsafeAddr())
    realPtrToY := (*[]byte)(ptrToY)
    *realPtrToY = []byte(v)
    }

    func change_redis_slice_val(f *redis.StringSliceCmd, v []string) {
    pointerVal := reflect.ValueOf(f)
    val := reflect.Indirect(pointerVal)
    member := val.FieldByName("val")
    ptrToY := unsafe.Pointer(member.UnsafeAddr())
    realPtrToY := (*[]string)(ptrToY)
    *realPtrToY = v
    }

    func main(){
    m := redis.NewStringCmd("KEYS", "driver*")
    change_redis_val(m, "victory")
    fmt.Println("Redis value:", m.Val())

    m2 := redis.NewStringSliceCmd("HMGET", "option")
    change_redis_slice_val(m2, []string{"1", "2", "3"})
    fmt.Println("Redis slice value:", m2.Val())

    a := new(A)
    change_val(a, "lalalal")
    fmt.Println(a.Val())

    b := new(B)
    change_b_val(b, []string{"1", "2", "3"})
    fmt.Println(b.Val())
    }