zig

commit 2b3b355a23bea47aacbdfd56b853abc83e2f3ed6 (tree)
parent 3fdffe85c0e51d1ec27e6ab4367a6293c18ce44c
Author: Julius Putra Tanu Setiaji <indocomsoft@gmail.com>
Date:   Mon, 28 Dec 2020 09:43:52 +0800

Add compileError message for StringHashMap in AutoHashMap

Diffstat:
M
lib/std/hash_map.zig
 | 
11
+++++++++++

1 file changed, 11 insertions(+), 0 deletions(-)
diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
@@ -17,6 +17,17 @@ const Allocator = mem.Allocator;
 const Wyhash = std.hash.Wyhash;
 
 pub fn getAutoHashFn(comptime K: type) (fn (K) u64) {
+    comptime {
+        assert(@hasDecl(std, "StringHashMap")); // detect when the following message needs updated
+        if (K == []const u8) {
+            @compileError("std.auto_hash.autoHash does not allow slices here (" ++
+                @typeName(K) ++
+                ") because the intent is unclear. " ++
+                "Consider using std.StringHashMap for hashing the contents of []const u8. " ++
+                "Alternatively, consider using std.auto_hash.hash or providing your own hash function instead.");
+        }
+    }
+
     return struct {
         fn hash(key: K) u64 {
             if (comptime trait.hasUniqueRepresentation(K)) {