disallow single-item pointer indexing

add pointer arithmetic for unknown length pointer

1 files changed, 30 insertions, 0 deletions

diff --git a/test/cases/pointers.zig b/test/cases/pointers.zig
index 87b3d25a74..47afb60a2e 100644
--- a/test/cases/pointers.zig
+++ b/test/cases/pointers.zig
@@ -12,3 +12,33 @@ fn testDerefPtr() void {
     y.* += 1;
     assert(x == 1235);
 }
+
+test "pointer arithmetic" {
+    var ptr = c"abcd";
+
+    assert(ptr[0] == 'a');
+    ptr += 1;
+    assert(ptr[0] == 'b');
+    ptr += 1;
+    assert(ptr[0] == 'c');
+    ptr += 1;
+    assert(ptr[0] == 'd');
+    ptr += 1;
+    assert(ptr[0] == 0);
+    ptr -= 1;
+    assert(ptr[0] == 'd');
+    ptr -= 1;
+    assert(ptr[0] == 'c');
+    ptr -= 1;
+    assert(ptr[0] == 'b');
+    ptr -= 1;
+    assert(ptr[0] == 'a');
+}
+
+test "double pointer parsing" {
+    comptime assert(PtrOf(PtrOf(i32)) == **i32);
+}
+
+fn PtrOf(comptime T: type) type {
+    return *T;
+}