From 180a389832ea505df5a05620a35fcfc4ba311936 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Wed, 27 Apr 2011 18:10:02 -0700
Subject: stdlib/rt: Add an unsafe function to cast immutable vectors to
 mutable ones

---
 src/lib/_vec.rs         | 2 ++
 src/rt/rust_builtin.cpp | 9 +++++++++
 src/rt/rustrt.def.in    | 1 +
 3 files changed, 12 insertions(+)

(limited to 'src')

diff --git a/src/lib/_vec.rs b/src/lib/_vec.rs
index cc8fabca..ab222be9 100644
--- a/src/lib/_vec.rs
+++ b/src/lib/_vec.rs
@@ -31,6 +31,8 @@ native "rust" mod rustrt {
     fn vec_print_debug_info[T](vec[T] v);
 
     fn vec_from_vbuf[T](vbuf v, uint n_elts) -> vec[T];
+
+    fn unsafe_vec_to_mut[T](vec[T] v) -> vec[mutable T];
 }
 
 fn alloc[T](uint n_elts) -> vec[T] {
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 5566835d..a2323898 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -178,6 +178,15 @@ vec_from_vbuf(rust_task *task, type_desc *ty, void *vbuf, size_t n_elts)
                                vbuf);
 }
 
+extern "C" CDECL rust_vec*
+unsafe_vec_to_mut(rust_task *task, type_desc *ty, rust_vec *v)
+{
+    if (v->ref_count != CONST_REFCOUNT) {
+        v->ref();
+    }
+    return v;
+}
+
 extern "C" CDECL rust_str*
 str_alloc(rust_task *task, size_t n_bytes)
 {
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index e378fa8d..d30c146e 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -33,6 +33,7 @@ str_from_vec
 str_push_byte
 str_vec
 task_sleep
+unsafe_vec_to_mut
 unsupervise
 upcall_clone_chan
 upcall_del_chan
-- 
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