diff --git a/include/nana/paint/graphics.hpp b/include/nana/paint/graphics.hpp
index 7d6d6df8..9ce35704 100644
--- a/include/nana/paint/graphics.hpp
+++ b/include/nana/paint/graphics.hpp
@@ -85,13 +85,13 @@ namespace nana
 
 			bool changed() const;           ///< Returns true if the graphics object is operated
 			bool empty() const;             ///< Returns true if the graphics object does not refer to any resource.
-			operator const void*() const;
+			explicit operator bool() const noexcept;
 
 			drawable_type handle() const;
 			const void* pixmap() const;
 			const void* context() const;
 
-			void swap(graphics& other);
+			void swap(graphics& other) noexcept;
 
 			/// Creates a graphics/drawable resource
 			/**
diff --git a/source/paint/graphics.cpp b/source/paint/graphics.cpp
index a048423c..00cb26de 100644
--- a/source/paint/graphics.cpp
+++ b/source/paint/graphics.cpp
@@ -269,7 +269,7 @@ namespace paint
 			return (!impl_->handle);
 		}
 
-		graphics::operator const void *() const
+		graphics::operator bool() const
 		{
 			return impl_->handle;
 		}