zig

commit 7f6b0ba6eafd566a5a9243286ba59fc0e4587d30 (tree)
parent 4174134108fdef462c2483f4ca5aa40dd6398d55
Author: Andrew Kelley <superjoe30@gmail.com>
Date:   Sun,  7 Feb 2016 01:25:04 -0700

ability to explicitly cast maybe pointers to each other

Diffstat:
M
src/analyze.cpp
 | 
9
+++++++++
M
test/self_hosted.zig
 | 
7
+++++++

2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/src/analyze.cpp b/src/analyze.cpp
@@ -3702,6 +3702,15 @@ static TypeTableEntry *analyze_cast_expr(CodeGen *g, ImportTableEntry *import, B
         return resolve_cast(g, context, node, expr_node, wanted_type, CastOpPointerReinterpret, false);
     }
 
+    // explicit cast from maybe pointer to another maybe pointer
+    if (actual_type->id == TypeTableEntryIdMaybe &&
+        actual_type->data.maybe.child_type->id == TypeTableEntryIdPointer &&
+        wanted_type->id == TypeTableEntryIdMaybe &&
+        wanted_type->data.maybe.child_type->id == TypeTableEntryIdPointer)
+    {
+        return resolve_cast(g, context, node, expr_node, wanted_type, CastOpPointerReinterpret, false);
+    }
+
     // explicit cast from child type of maybe type to maybe type
     if (wanted_type->id == TypeTableEntryIdMaybe) {
         if (types_match_const_cast_only(wanted_type->data.maybe.child_type, actual_type)) {
diff --git a/test/self_hosted.zig b/test/self_hosted.zig
@@ -208,3 +208,10 @@ fn wants_fn_with_void(f: fn()) { }
 fn fn_with_unreachable() -> unreachable {
     unreachable {}
 }
+
+
+#attribute("test")
+fn explicit_cast_maybe_pointers() {
+    const a: ?&i32 = undefined;
+    const b: ?&f32 = (?&f32)(a);
+}