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Unsafe

This package is for "safely" modifying unexported fields of a struct.

Safety Considerations

Contrary to popular belief, the unsafe package is actually safe to use - provided you know what you are doing.

1. You need to ensure the newValue is the same type as the field's type.
2. You need to make sure the field is not being modifed by multiple go-routines concurrently.
3. Read Exploring ‘unsafe’ Features in Go 1.20: A Hands-On Demo and Modifying Private Variables of a Struct in Go Using unsafe and reflect.

Example 1 - Setting a field

type Example struct {
	e string // unexported string 
}

Let's modify the Example struct's e field.

import "github.com/rocketlaunchr/unsafe"

e := Example{}

// Option 1
ptr := unsafe.SetField[string](&e, unsafe.F("e"))
*(*string)(ptr) = "New Value" // Note: If the field type is string, then ptr must be cast to *string

// Option 2
unsafe.SetField(&e, unsafe.F("e"), "New Value 2")

Example 2 - Reading a field

val := unsafe.Value[string](&e, unsafe.F("e"))

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