如何比较结构，切片，地图是否相等？ [英] How to compare struct, slice, map are equal?

问题描述

我想检查两个结构是否相等，但有一些问题：

I want to check that two structs are equal, but have some problem:

package main

import (
"fmt"
"reflect"
)

type T struct {
    X int
    Y string
    Z []int
    M map[string]int
}

func main() {
    t1 := T{
        X:1,
        Y:"lei",
        Z:[]int{1,2,3},
        M:map[string]int{
            "a":1,
            "b":2,
        },
    }

    t2 :=  T{
        X:1,
        Y:"lei",
        Z:[]int{1,2,3},
        M:map[string]int{
            "a":1,
            "b":2,
        },
    }


    fmt.Println(t2 == t1)
    //error - invalid operation: t2 == t1 (struct containing []int cannot be compared)


    fmt.Println(reflect.ValueOf(t2) == reflect.ValueOf(t1))
    //false
    fmt.Println(reflect.TypeOf(t2) == reflect.TypeOf(t1))
    //true


    //Update: slice or map
    a1 := []int{1,2,3,4}
    a2 := []int{1,2,3,4}

    fmt.Println(a1==a2)
    //invalid operation: a1 == a2 (slice can only be compared to nil)

    m1 := map[string]int{   
        "a":1,
        "b":2,
    }
    m2 := map[string]int{   
        "a":1,
        "b":2,
    }
    fmt.Println(m1==m2)
    // m1 == m2 (map can only be compared to nil)
}

http://play.golang.org/p/AZIzW2WunI

推荐答案

您可以使用 reflect.DeepEqual ，或者您可以实施自己的功能（哪种性能明智的会比使用反射更好）：

You can use reflect.DeepEqual, or you can implement your own function (which performance wise would be better than using reflection):

http ：//play.golang.org/p/CPdfsYGNy_

m1 := map[string]int{   
    "a":1,
    "b":2,
}
m2 := map[string]int{   
    "a":1,
    "b":2,
}
fmt.Println(reflect.DeepEqual(m1, m2))

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