diff --git a/src/core/IntrusivePtr.hpp b/src/core/IntrusivePtr.hpp
index 11b78b1c..004c5ec6 100644
--- a/src/core/IntrusivePtr.hpp
+++ b/src/core/IntrusivePtr.hpp
@@ -67,6 +67,11 @@ namespace easy2d
 
 		inline Type* Get() const E2D_NOEXCEPT { return ptr_; }
 
+		inline void Reset() E2D_NOEXCEPT
+		{
+			IntrusivePtr{}.Swap(*this);
+		}
+
 		inline void Swap(IntrusivePtr& other) E2D_NOEXCEPT
 		{
 			std::swap(ptr_, other.ptr_);
diff --git a/src/math/scalar.hpp b/src/math/scalar.hpp
index d32eb8ba..1d6ec463 100644
--- a/src/math/scalar.hpp
+++ b/src/math/scalar.hpp
@@ -22,12 +22,6 @@
 #include "constants.hpp"
 #include <cmath>
 
-#if _MSC_VER >= 1900
-#	define E2D_CONSTEXPR constexpr
-#else
-#	define E2D_CONSTEXPR const
-#endif
-
 
 namespace easy2d
 {