4 files changed, 13 insertions, 7 deletions
diff --git a/alc/backends/wasapi.cpp b/alc/backends/wasapi.cpp
index 3d85e3e1..063fca98 100644
--- a/alc/backends/wasapi.cpp
+++ b/alc/backends/wasapi.cpp
@@ -463,7 +463,7 @@ struct WasapiProxy {
         const char *mParam;
         std::promise<HRESULT> mPromise;
 
-        operator bool() const noexcept { return mType != MsgType::QuitThread; }
+        explicit operator bool() const noexcept { return mType != MsgType::QuitThread; }
     };
     static std::deque<Msg> mMsgQueue;
     static std::mutex mMsgQueueLock;
diff --git a/common/comptr.h b/common/comptr.h
index c238991a..ab9d4c53 100644
--- a/common/comptr.h
+++ b/common/comptr.h
@@ -49,7 +49,7 @@ public:
         return *this;
     }
 
-    operator bool() const noexcept { return mPtr != nullptr; }
+    explicit operator bool() const noexcept { return mPtr != nullptr; }
 
     T& operator*() const noexcept { return *mPtr; }
     T* operator->() const noexcept { return mPtr; }
diff --git a/common/intrusive_ptr.h b/common/intrusive_ptr.h
index cc82dea5..e1fc1f7b 100644
--- a/common/intrusive_ptr.h
+++ b/common/intrusive_ptr.h
@@ -74,7 +74,7 @@ public:
         return *this;
     }
 
-    operator bool() const noexcept { return mPtr != nullptr; }
+    explicit operator bool() const noexcept { return mPtr != nullptr; }
 
     T& operator*() const noexcept { return *mPtr; }
     T* operator->() const noexcept { return mPtr; }
diff --git a/common/opthelpers.h b/common/opthelpers.h
index 5e6f54cf..0b8b8210 100644
--- a/common/opthelpers.h
+++ b/common/opthelpers.h
@@ -12,16 +12,22 @@
  * is not required to be true, but it can result in more optimal code for the
  * true path at the expense of a less optimal false path.
  */
-constexpr bool likely(bool expr) { return __builtin_expect(expr, true); }
+template<typename T>
+constexpr bool likely(T&& expr) noexcept
+{ return __builtin_expect(static_cast<bool>(expr), true); }
 /* The opposite of likely(), optimizing for the case where the condition is
  * false.
  */
-constexpr bool unlikely(bool expr) { return __builtin_expect(expr, false); }
+template<typename T>
+constexpr bool unlikely(T&& expr) noexcept
+{ return __builtin_expect(static_cast<bool>(expr), false); }
 
 #else
 
-constexpr bool likely(bool expr) { return expr; }
-constexpr bool unlikely(bool expr) { return expr; }
+template<typename T>
+constexpr bool likely(T&& expr) noexcept { return static_cast<bool>(expr); }
+template<typename T>
+constexpr bool unlikely(T&& expr) noexcept { return static_cast<bool>(expr); }
 #endif
 #define LIKELY(x) (likely(x))
 #define UNLIKELY(x) (unlikely(x))