v2 / vlib / v / tests / comptime / comptime_eq_test.v
34 lines · 31 sloc · 452 bytes · 6488041a749df9762348d019c4223908c476f2e2
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1struct Abc {


2    id     int


3    name   string


4    letter string


5}


6


7fn join[T](mut old T, new T) {


8    $if T is $struct {


9        default := T{}


10        $for field in T.fields {


11            if new.$(field.name) != default.$(field.name) {


12                old.$(field.name) = new.$(field.name)


13            }


14        }


15    }


16}


17


18fn test_main() {


19    mut a := Abc{


20        name:   'Peter'


21        letter: 'a'


22    }


23    b := Abc{


24        id:     1


25        letter: 'b'


26    }


27    join(mut a, b)


28


29    assert a == Abc{


30        name:   'Peter'


31        id:     1


32        letter: 'b'


33    }


34}


35