Tag Archives: Go operator == is not defined

[Go] Can structure/structure pointer be compared with operator == is not defined error

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Can two instances of the same struct be compared == !=
Answer: yes or no

Can two different instances of struct be compared == !=
Answer: yes or no

If all the member variables of the structure are comparable, then the structure can be compared.
If there are incomparable member variables in the structure, then the structure cannot be compared

    type s2 struct {
        name string
    }
    aa: = s2{
        name: " aa " ,
    }
    bb: = s2{
        name: " aa " ,
    }
    fmt.Printf( " %v\n " , aa == bb)

This returns true

If it is a structure pointer, return false

 

When there are incomparable fields, an error will be reported at compile time

 

 Change to a structure pointer, there will be no error

 

 Return result false; true

Code:

    type s1 struct {
        one map[ string ] string 
        two [] string 
        three string
    }

    a: = & s1{
        one: map[ string ] string { " aaa " : " bbb " },
        two: [] string { " aaa " , " bbb " },
        three: " aaaa " ,
    }
    b: = & s1{
        one: map[ string ] string { " aaa " : " bbb " },
        two: [] string { " aaa " , " bbb " },
        three: " aaaa " ,
    }
    c : = a
    fmt.Printf( " %v;%v " , a == b, a == c)