new pointers.toUncheckedArray

Author: timotheecour

changelog.md

@@ -212,6 +212,7 @@
 - Added `progressInterval` argument to `asyncftpclient.newAsyncFtpClient` to control the interval
   at which progress callbacks are called.
 
+- Added module `pointers` containing `toUncheckedArray`
 
 ## Language changes
 

lib/std/pointers.nim

@@ -0,0 +1,15 @@
+##[
+Convenience procs to deal with pointer-like variables.
+]##
+
+proc toUncheckedArray*[T](a: ptr[T]): ptr UncheckedArray[T] {.inline.} =
+  ## calls `cast[ptr UncheckedArray[T]]` (less error prone).
+  runnableExamples:
+    var a = @[10, 11, 12]
+    let pa = a[1].addr.toUncheckedArray
+    doAssert pa[-1] == 10
+    pa[0] = 100
+    doAssert a == @[10, 100, 12]
+    pa[0] += 5
+    doAssert a[1] == 105
+  cast[ptr UncheckedArray[T]](a)