How Can I Assign a Slice of Structs to a Slice of Interfaces in Go?

Assigning Slice of Structs to Interface Slice

When attempting to assign a slice of structs ([]MyStruct) to a slice of interfaces ([]interface{}), you may encounter a compile-time error. This is because structs and interfaces have different memory representations.

Structs have their fields stored adjacent in memory, while interfaces are stored as a two-word pair, one for type information and one for the actual data. This difference prevents direct assignment.

Possible Solutions:

• Copy Elements Individually: You can manually iterate over the struct slice and copy each element into the interface slice.

y := make([]interface{}, len(x))
for i, v := range x {
    y[i] = v
}

• Utilize Interface Wrapper: You can create a wrapper type that implements the interface{} interface and holds the underlying struct.

type IMyStruct struct {
    MyStruct
}

func (i IMyStruct) Interface() interface{} {
    return i.MyStruct
}

x := []MyStruct{{5}, {6}}
y := []interface{}{IMyStruct{x[0]}, IMyStruct{x[1]}}

• Use Empty Interface: You can assign the slice of structs to an empty interface, which can hold values of any type.

var y interface{}
y = x // No type conversion required

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