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add suggestion to AutoHash compile error message

master
Andrew Kelley 2019-08-28 14:38:55 -04:00
parent af90da1531
commit e8a9caa3dd
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1 changed files with 12 additions and 2 deletions
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14
std/hash/auto_hash.zig
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@ -1,5 +1,6 @@
const std = @import("std");
const builtin = @import("builtin");
const assert = std.debug.assert;
const mem = std.mem;
const meta = std.meta;
@ -165,8 +166,17 @@ pub fn hash(hasher: var, key: var, comptime strat: HashStrategy) void {
/// Slices are rejected to avoid ambiguity on the user's intention.
pub fn autoHash(hasher: var, key: var) void {
const Key = @typeOf(key);
if (comptime meta.trait.isSlice(Key))
@compileError("std.auto_hash.autoHash does not allow slices (here " ++ @typeName(Key) ++ " because the intent is unclear. Consider using std.auto_hash.hash or providing your own hash function instead.");
if (comptime meta.trait.isSlice(Key)) {
comptime assert(@hasDecl(std, "StringHashMap")); // detect when the following message needs updated
const extra_help = if (Key == []const u8)
" Consider std.StringHashMap for hashing the contents of []const u8."
else
"";
@compileError("std.auto_hash.autoHash does not allow slices (here " ++ @typeName(Key) ++
") because the intent is unclear. Consider using std.auto_hash.hash or providing your own hash function instead." ++
extra_help);
}
hash(hasher, key, .Shallow);
}