Can Go\'s `interface{}` Arrays Directly Hold Struct Arrays?

Assigning Struct Arrays to Interface Arrays in Go

In Go, assigning a struct array directly to an interface array raises a compile-time error. To understand why, let's delve into the underlying mechanisms.

Interface Storage

interface{} represents a generic type that can store any value. However, it's internally represented as a two-word pair:

1. Type word: Holds information about the underlying data type.
2. Data word: Stores the actual data value.

Struct Storage

In contrast to interfaces, structs store their fields contiguously in memory, without a separate type word.

Assignment Issue

Since structs and interfaces have different memory representations, they cannot be assigned directly. The type system ensures this to maintain type safety.

Workarounds

To achieve the desired behavior, consider these options:

Using a Slice of Interfaces

You can create a slice of interfaces and assign the struct elements individually:

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

Storing an Interface to the Slice

Alternatively, store an interface to the struct slice:

var y interface{}
y = x 

The above is the detailed content of Can Go\'s `interface{}` Arrays Directly Hold Struct Arrays?. For more information, please follow other related articles on the PHP Chinese website!