From 9ad57df473432b5efba46d52440eb0e1400e1e36 Mon Sep 17 00:00:00 2001
From: Zahary Karadjov <zahary@gmail.com>
Date: Fri, 16 Feb 2018 16:58:46 +0200
Subject: [PATCH] obtain mem ranges from strings and sequences

---
 .gitignore           |  6 ++++++
 ranges/memranges.nim | 17 ++++++++---------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/.gitignore b/.gitignore
index 67d9b34..68e6fec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,7 @@
+# ignore all executable files
+*
+!*.*
+!*/
+
 nimcache/
+
diff --git a/ranges/memranges.nim b/ranges/memranges.nim
index 8df5e20..fe0a28c 100644
--- a/ranges/memranges.nim
+++ b/ranges/memranges.nim
@@ -10,16 +10,15 @@ template len*(mr: MemRange): int = mr.size
 template `[]`*(mr: MemRange, idx: int): byte = (cast[ptr byte](shift(mr.start, idx)))[]
 proc baseAddr*(mr: MemRange): pointer = mr.start
 
-when false:
-  # XXX: Alternative definition that crashes the compiler. Investigate
-  type
-    MemRange* = distinct (pointer, csize)
-
-  template len*(mr: MemRange): int = mr[1]
-  template `[]`*(mr: MemRange, idx: int): byte = (cast[ptr byte](shift(mr[0], idx)))[]
-  proc baseAddr*(mr: MemRange): pointer = mr[0]
-
 proc makeMemRange*(start: pointer, size: csize): MemRange =
   result.start = start
   result.size = size
 
+proc toMemRange*(x: string): MemRange =
+  result.start = x.cstring.pointer
+  result.size = x.len
+
+proc toMemRange*[T](x: openarray[T]): MemRange =
+  result.start = cast[pointer](x)
+  result.size = x.len * T.sizeof
+