From c34035b9491c201eca226a2e065fd9753d706433 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 15 Oct 2023 00:07:24 +0800
Subject: Improve bitmask.

Bool conversion -> explicit
std::hash support
---
 include/cru/common/Bitmask.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'include/cru/common/Bitmask.h')

diff --git a/include/cru/common/Bitmask.h b/include/cru/common/Bitmask.h
index bd6a8309..b1e8495e 100644
--- a/include/cru/common/Bitmask.h
+++ b/include/cru/common/Bitmask.h
@@ -1,6 +1,8 @@
 #pragma once
 #include "Base.h"
 
+#include <functional>
+
 namespace cru {
 template <typename Tag, typename TUnderlying = unsigned>
 struct Bitmask final {
@@ -35,8 +37,19 @@ struct Bitmask final {
   bool operator!=(Bitmask rhs) const { return this->value != rhs.value; }
 
   explicit operator TUnderlying() const { return value; }
-  operator bool() const { return value != 0; }
+  explicit operator bool() const { return value != 0; }
 
   TUnderlying value;
 };
 }  // namespace cru
+
+namespace std {
+template <typename Tag, typename TUnderlying>
+struct hash<cru::Bitmask<Tag, TUnderlying>> {
+  using Bitmask = cru::Bitmask<Tag, TUnderlying>;
+
+  std::size_t operator()(Bitmask bitmask) const {
+    return std::hash<TUnderlying>{}(bitmask.value);
+  }
+};
+}  // namespace std
-- 
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