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+---
+tags:
+  - golang
+  - go-weekly
+authors:
+  - fuatto
+title: 'Go Commentary #23: Draft Release Notes for Go 1.24 and weak pointers in Go'
+short_title: '#23 Draft Release Notes for Go 1.24 and weak pointers in Go'
+description: Draft Release Notes for Go 1.24 and the incoming of weak pointers in Go
+date: 2024-12-06
+---
+
+## [Draft Release Notes Go 1.24](https://tip.golang.org/doc/go1.24)
+
+### Go 1.24 is not yet released. These are work-in-progress release notes. Go 1.24 is expected to be released in February 2025.
+
+- Fully supports *generic type aliases*: a type alias may be parameterized like a defined type
+
+```go
+type (
+	nodeList = []*Node  // nodeList and []*Node are identical types
+	Polar    = polar    // Polar and polar denote identical types
+)
+```
+
+  => Specs:
+
+```go
+type set[P comparable] = map[P]bool
+type A[P any] = P    // illegal: P is a type parameter
+```
+
+  => the feature can be disabled by setting `GOEXPERIMENT=noaliastypeparams`; but the `aliastypeparams` setting will be removed for Go 1.25.
+
+- Some updates for tools `go tool` or `-tool` flag, new `tests` analyzer for `go vet`
+
+- Some updates for Cgo, Runtime, Compiler, Linker, Bootstrap
+
+- Some updates for stdlibs:
+
+  - The new `os.Root` type provides the ability to perform filesystem operations within a specific directory.
+
+  - The `os.OpenRoot` function opens a directory and returns an `os.Root`. Methods on `os.Root` operate within the directory and do not permit paths that refer to locations outside the directory, including ones that follow symbolic links out of the directory.
+
+    `os.Root.Open` opens a file for reading.
+
+    `os.Root.Create` creates a file.
+
+    `os.Root.OpenFile` is the generalized open call.
+
+    `os.Root.Mkdir` creates a directory.
+
+  - Some updates for `crypto`, `hash` package
+
+  - Some updates for `net/http` including support for HTTP/2 protocol settings in `Transport` and `Server`
+
+  - New implementation for `sync.Map` that will improve overall performance and resolve some long-standing issues
+
+
+## [Weak Pointers in Go: Why They Matter Now](https://victoriametrics.com/blog/go-weak-pointer/)
+
+### Definition:
+
+A type of reference to an object that does not prevent the object from being garbage collected
+
+=> `weak` package:
+
+```go
+type Pointer[T any] struct {
+	u unsafe.Pointer
+}
+
+// Make creates a weak pointer from a strong pointer to some value of type T.
+func Make[T any](ptr *T) Pointer[T] {
+  //...
+}
+```
+
+- If the memory they’re pointing to gets cleaned up, the weak pointer automatically becomes `nil` — so there’s no risk of accidentally pointing to freed memory => they are safe
+
+```go
+type T struct {
+  a int
+  b int
+}
+
+func main() {
+  a := new(string)
+  println("original:", a)
+
+  // make a weak pointer
+  weakA := weak.Make(a)
+
+  runtime.GC()
+
+  // use weakA
+  strongA := weakA.Strong()
+  println("strong:", strongA, a)
+
+  runtime.GC()
+
+  // use weakA again
+  strongA = weakA.Strong()
+  println("strong:", strongA)
+}
+
+// Output:
+// original: 0x1400010c670
+// strong: 0x1400010c670 0x1400010c670
+// strong: 0x0
+```
+
+- After the first garbage collection `runtime.GC()`, the weak pointer weakA still points to the memory because we’re still using the variable a in the `println("strong:", strongA, a)` line. The memory can’t be cleaned up yet since it’s in use.
+- But when the second garbage collection runs, the strong reference (a) isn’t used anymore. That means the garbage collector can safely clean up the memory, leaving `weakA.Strong()` to return `nil`.
+
+### Use case
+
+- Canonicalization maps, where you only want to keep one copy of a piece of data around 
+- Initial purpose is in internal packages, e.g: `unique`
+
+```go
+func main() {
+	h1 := unique.Make("Hello")
+	h2 := unique.Make("Hello")
+	w1 := unique.Make("World")
+
+	fmt.Println("h1:", h1)
+	fmt.Println("h2:", h2)
+	fmt.Println("w1:", w1)
+	fmt.Println("h1 == h2:", h1 == h2)
+	fmt.Println("h1 == w1:", h1 == w1)
+}
+
+// Output:
+// h1: {0x14000090270}
+// h2: {0x14000090270}
+// w1: {0x14000090280}
+// h1 == h2: true
+// h1 == w1: false
+```
+
+### How does it work
+
+- Having a in-between tiny object (8bytes)
+
+![](assets/weak-pointer-indirection-reference.webp)
+
+- This setup lets the garbage collector clean up weak pointers to a specific object all at once, efficiently: 
+  - the collector only needs to set the pointer in the indirection object to nil (or 0x0). No need to go around updating each weak pointer individually.
+
+![](assets/weak-pointer-gc-reclaim.webp)
+
+---
+
+https://tip.golang.org/doc/go1.24
+
+https://victoriametrics.com/blog/go-weak-pointer/  
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