Introduce hash.lookup.isHashFunction trait

Fix #66.
2018-09-14 15:16:08 +02:00
parent b6d1766d58
commit b831a05407
3 changed files with 28 additions and 4 deletions
--- a/source/tanya/container/hashtable.d
+++ b/source/tanya/container/hashtable.d
@ -386,7 +386,7 @@ struct ByValue(T)
 *  hasher = Hash function for $(D_PARAM Key).
 */
 struct HashTable(Key, Value, alias hasher = hash)
-if (is(typeof(((Key k) => hasher(k))(Key.init)) == size_t))
+if (isHashFunction!(hasher, Key))
 {
    private alias HashArray = .HashArray!(hasher, Key, Value);
    private alias Buckets = HashArray.Buckets;