diff --git a/include/bx/allocator.h b/include/bx/allocator.h
index 5074277..6ded304 100644
--- a/include/bx/allocator.h
+++ b/include/bx/allocator.h
@@ -33,13 +33,6 @@
 #define BX_ALIGNED_NEW(_allocator, _type, _align) BX_PLACEMENT_NEW(BX_ALIGNED_ALLOC(_allocator, sizeof(_type), _align), _type)
 #define BX_PLACEMENT_NEW(_ptr, _type)             ::new(bx::PlacementNew, _ptr) _type
 
-namespace bx
-{
-	struct    PlacementNewTag {};
-	constexpr PlacementNewTag PlacementNew;
-
-} // namespace bx
-
 void* operator new(size_t, bx::PlacementNewTag, void* _ptr);
 void  operator delete(void*, bx::PlacementNewTag, void*) throw();
 
diff --git a/include/bx/bounds.h b/include/bx/bounds.h
index e94c864..bc0c20b 100644
--- a/include/bx/bounds.h
+++ b/include/bx/bounds.h
@@ -13,53 +13,53 @@ namespace bx
 	///
 	struct Line
 	{
-		Vec3 pos = init::None;
-		Vec3 dir = init::None;
+		Vec3 pos = InitNone;
+		Vec3 dir = InitNone;
 	};
 
 	///
 	struct LineSegment
 	{
-		Vec3 pos = init::None;
-		Vec3 end = init::None;
+		Vec3 pos = InitNone;
+		Vec3 end = InitNone;
 	};
 
 	///
 	struct Aabb
 	{
-		Vec3 min = init::None;
-		Vec3 max = init::None;
+		Vec3 min = InitNone;
+		Vec3 max = InitNone;
 	};
 
 	///
 	struct Capsule
 	{
-		Vec3  pos = init::None;
-		Vec3  end = init::None;
+		Vec3  pos = InitNone;
+		Vec3  end = InitNone;
 		float radius;
 	};
 
 	///
 	struct Cone
 	{
-		Vec3  pos = init::None;
-		Vec3  end = init::None;
+		Vec3  pos = InitNone;
+		Vec3  end = InitNone;
 		float radius;
 	};
 
 	///
 	struct Cylinder
 	{
-		Vec3  pos = init::None;
-		Vec3  end = init::None;
+		Vec3  pos = InitNone;
+		Vec3  end = InitNone;
 		float radius;
 	};
 
 	///
 	struct Disk
 	{
-		Vec3  center = init::None;
-		Vec3  normal = init::None;
+		Vec3  center = InitNone;
+		Vec3  normal = InitNone;
 		float radius;
 	};
 
@@ -72,30 +72,30 @@ namespace bx
 	///
 	struct Sphere
 	{
-		Vec3  center = init::None;
+		Vec3  center = InitNone;
 		float radius;
 	};
 
 	///
 	struct Triangle
 	{
-		Vec3 v0 = init::None;
-		Vec3 v1 = init::None;
-		Vec3 v2 = init::None;
+		Vec3 v0 = InitNone;
+		Vec3 v1 = InitNone;
+		Vec3 v2 = InitNone;
 	};
 
 	///
 	struct Ray
 	{
-		Vec3 pos = init::None;
-		Vec3 dir = init::None;
+		Vec3 pos = InitNone;
+		Vec3 dir = InitNone;
 	};
 
 	///
 	struct Hit
 	{
-		Vec3  pos   = init::None;
-		Plane plane = init::None;
+		Vec3  pos   = InitNone;
+		Plane plane = InitNone;
 	};
 
 	///
diff --git a/include/bx/bx.h b/include/bx/bx.h
index 5a996de..45e3335 100644
--- a/include/bx/bx.h
+++ b/include/bx/bx.h
@@ -36,8 +36,25 @@
 ///
 #define BX_ENABLED(_x) BX_IGNORE_C4127(bx::isEnabled<!!(_x)>::value)
 
+///
+#define BX_DECLARE_TAG(_name)  \
+	struct    _name ## Tag {}; \
+	constexpr _name ## Tag _name
+
 namespace bx
 {
+	/// Placement new tag.
+	BX_DECLARE_TAG(PlacementNew);
+
+	/// Fields are left uninitialized.
+	BX_DECLARE_TAG(InitNone);
+
+	/// Fields are initialized to zero.
+	BX_DECLARE_TAG(InitZero);
+
+	/// Fields are initialized to identity value.
+	BX_DECLARE_TAG(InitIdentity);
+
 	/// Arithmetic type `Ty` limits.
 	template<typename Ty, bool SignT = isSigned<Ty>()>
 	struct LimitsT;
diff --git a/include/bx/inline/math.inl b/include/bx/inline/math.inl
index ccab654..ca73eb4 100644
--- a/include/bx/inline/math.inl
+++ b/include/bx/inline/math.inl
@@ -390,7 +390,7 @@ namespace bx
 	template<typename Ty>
 	inline Ty load(const void* _ptr)
 	{
-		Ty result(init::None);
+		Ty result(InitNone);
 		memCopy(&result, _ptr, sizeof(Ty) );
 		return result;
 	}
@@ -401,18 +401,18 @@ namespace bx
 		memCopy(_ptr, &_a, sizeof(Ty) );
 	}
 
-	inline Vec3::Vec3(init::NoneTag)
+	inline Vec3::Vec3(InitNoneTag)
 	{
 	}
 
-	constexpr Vec3::Vec3(init::ZeroTag)
+	constexpr Vec3::Vec3(InitZeroTag)
 		: x(0.0f)
 		, y(0.0f)
 		, z(0.0f)
 	{
 	}
 
-	constexpr Vec3::Vec3(init::IdentityTag)
+	constexpr Vec3::Vec3(InitIdentityTag)
 		: x(0.0f)
 		, y(0.0f)
 		, z(0.0f)
@@ -433,18 +433,18 @@ namespace bx
 	{
 	}
 
-	inline Plane::Plane(init::NoneTag)
-		: normal(init::None)
+	inline Plane::Plane(InitNoneTag)
+		: normal(InitNone)
 	{
 	}
 
-	constexpr Plane::Plane(init::ZeroTag)
-		: normal(init::Zero)
+	constexpr Plane::Plane(InitZeroTag)
+		: normal(InitZero)
 		, dist(0.0f)
 	{
 	}
 
-	constexpr Plane::Plane(init::IdentityTag)
+	constexpr Plane::Plane(InitIdentityTag)
 		: normal(0.0f, 1.0f, 0.0f)
 		, dist(0.0f)
 	{
@@ -456,11 +456,11 @@ namespace bx
 	{
 	}
 
-	inline Quaternion::Quaternion(init::NoneTag)
+	inline Quaternion::Quaternion(InitNoneTag)
 	{
 	}
 
-	constexpr Quaternion::Quaternion(init::ZeroTag)
+	constexpr Quaternion::Quaternion(InitZeroTag)
 		: x(0.0f)
 		, y(0.0f)
 		, z(0.0f)
@@ -468,7 +468,7 @@ namespace bx
 	{
 	}
 
-	constexpr Quaternion::Quaternion(init::IdentityTag)
+	constexpr Quaternion::Quaternion(InitIdentityTag)
 		: x(0.0f)
 		, y(0.0f)
 		, z(0.0f)
@@ -740,7 +740,7 @@ namespace bx
 
 	inline BX_CONST_FUNC Vec3 fromLatLong(float _u, float _v)
 	{
-		Vec3 result(init::None);
+		Vec3 result(InitNone);
 		const float phi   = _u * kPi2;
 		const float theta = _v * kPi;
 
@@ -1098,8 +1098,8 @@ namespace bx
 
 	inline void mtxFromNormal(float* _result, const Vec3& _normal, float _scale, const Vec3& _pos)
 	{
-		Vec3 tangent(init::None);
-		Vec3 bitangent(init::None);
+		Vec3 tangent(InitNone);
+		Vec3 bitangent(InitNone);
 		calcTangentFrame(tangent, bitangent, _normal);
 
 		store(&_result[ 0], mul(bitangent, _scale) );
@@ -1117,8 +1117,8 @@ namespace bx
 
 	inline void mtxFromNormal(float* _result, const Vec3& _normal, float _scale, const Vec3& _pos, float _angle)
 	{
-		Vec3 tangent(init::None);
-		Vec3 bitangent(init::None);
+		Vec3 tangent(InitNone);
+		Vec3 bitangent(InitNone);
 		calcTangentFrame(tangent, bitangent, _normal, _angle);
 
 		store(&_result[0], mul(bitangent, _scale) );
@@ -1183,7 +1183,7 @@ namespace bx
 
 	inline Vec3 mul(const Vec3& _vec, const float* _mat)
 	{
-		Vec3 result(init::None);
+		Vec3 result(InitNone);
 		result.x = _vec.x * _mat[0] + _vec.y * _mat[4] + _vec.z * _mat[ 8] + _mat[12];
 		result.y = _vec.x * _mat[1] + _vec.y * _mat[5] + _vec.z * _mat[ 9] + _mat[13];
 		result.z = _vec.x * _mat[2] + _vec.y * _mat[6] + _vec.z * _mat[10] + _mat[14];
@@ -1192,7 +1192,7 @@ namespace bx
 
 	inline Vec3 mulXyz0(const Vec3& _vec, const float* _mat)
 	{
-		Vec3 result(init::None);
+		Vec3 result(InitNone);
 		result.x = _vec.x * _mat[0] + _vec.y * _mat[4] + _vec.z * _mat[ 8];
 		result.y = _vec.x * _mat[1] + _vec.y * _mat[5] + _vec.z * _mat[ 9];
 		result.z = _vec.x * _mat[2] + _vec.y * _mat[6] + _vec.z * _mat[10];
diff --git a/include/bx/math.h b/include/bx/math.h
index 64c0e83..26d68ef 100644
--- a/include/bx/math.h
+++ b/include/bx/math.h
@@ -34,38 +34,19 @@ namespace bx
 		};
 	};
 
-	/// Structure initializer types.
-	namespace init
-	{
-		/// Fields are left uninitialized.
-		///
-		struct    NoneTag {};
-		constexpr NoneTag None;
-
-		/// Fields are initialized to zero.
-		///
-		struct    ZeroTag {};
-		constexpr ZeroTag Zero;
-
-		/// Fields are initialized to identity value.
-		///
-		struct    IdentityTag {};
-		constexpr IdentityTag Identity;
-	}
-
 	///
 	struct Vec3
 	{
 		Vec3() = delete;
 
 		///
-		Vec3(init::NoneTag);
+		Vec3(InitNoneTag);
 
 		///
-		constexpr Vec3(init::ZeroTag);
+		constexpr Vec3(InitZeroTag);
 
 		///
-		constexpr Vec3(init::IdentityTag);
+		constexpr Vec3(InitIdentityTag);
 
 		///
 		explicit constexpr Vec3(float _v);
@@ -82,13 +63,13 @@ namespace bx
 		Plane() = delete;
 
 		///
-		Plane(init::NoneTag);
+		Plane(InitNoneTag);
 
 		///
-		constexpr Plane(init::ZeroTag);
+		constexpr Plane(InitZeroTag);
 
 		///
-		constexpr Plane(init::IdentityTag);
+		constexpr Plane(InitIdentityTag);
 
 		///
 		constexpr Plane(Vec3 _normal, float _dist);
@@ -103,13 +84,13 @@ namespace bx
 		Quaternion() = delete;
 
 		///
-		Quaternion(init::NoneTag);
+		Quaternion(InitNoneTag);
 
 		///
-		constexpr Quaternion(init::ZeroTag);
+		constexpr Quaternion(InitZeroTag);
 
 		///
-		constexpr Quaternion(init::IdentityTag);
+		constexpr Quaternion(InitIdentityTag);
 
 		///
 		constexpr Quaternion(float _x, float _y, float _z, float _w);
diff --git a/src/bounds.cpp b/src/bounds.cpp
index 3233d3f..986c4c2 100644
--- a/src/bounds.cpp
+++ b/src/bounds.cpp
@@ -128,8 +128,8 @@ namespace bx
 
 	void toAabb(Aabb& _outAabb, const void* _vertices, uint32_t _numVertices, uint32_t _stride)
 	{
-		Vec3 mn(init::None);
-		Vec3 mx(init::None);
+		Vec3 mn(InitNone);
+		Vec3 mx(InitNone);
 		uint8_t* vertex = (uint8_t*)_vertices;
 
 		mn = mx = load<Vec3>(vertex);
@@ -150,8 +150,8 @@ namespace bx
 
 	void toAabb(Aabb& _outAabb, const float* _mtx, const void* _vertices, uint32_t _numVertices, uint32_t _stride)
 	{
-		Vec3 mn(init::None);
-		Vec3 mx(init::None);
+		Vec3 mn(InitNone);
+		Vec3 mx(InitNone);
 		uint8_t* vertex = (uint8_t*)_vertices;
 		mn = mx = mul(load<Vec3>(vertex), _mtx);
 
@@ -284,7 +284,7 @@ namespace bx
 
 		uint8_t* vertex = (uint8_t*)_vertices;
 
-		Vec3 center(init::None);
+		Vec3 center(InitNone);
 		float* position = (float*)&vertex[0];
 		center.x = position[0];
 		center.y = position[1];
@@ -592,8 +592,8 @@ namespace bx
 			return intersect(_ray, sphere, _hit);
 		}
 
-		Plane plane(init::None);
-		Vec3 pos(init::None);
+		Plane plane(InitNone);
+		Vec3 pos(InitNone);
 
 		if (0.0f >= height)
 		{
@@ -898,14 +898,14 @@ namespace bx
 
 	struct Srt
 	{
-		Quaternion rotation    = init::Identity;
-		Vec3       translation = init::Zero;
-		Vec3       scale       = init::Zero;
+		Quaternion rotation    = InitIdentity;
+		Vec3       translation = InitZero;
+		Vec3       scale       = InitZero;
 	};
 
 	Srt toSrt(const Aabb& _aabb)
 	{
-		return { init::Identity, getCenter(_aabb), getExtents(_aabb) };
+		return { InitIdentity, getCenter(_aabb), getExtents(_aabb) };
 	}
 
 	Srt toSrt(const void* _mtx)
@@ -1196,7 +1196,7 @@ namespace bx
 
 	Vec3 closestPoint(const Triangle& _triangle, const Vec3& _point)
 	{
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _triangle);
 
 		const Vec3 pos = closestPoint(plane, _point);
@@ -1255,7 +1255,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _triangle);
 
 		if (!overlap(_aabb, plane) )
@@ -1314,7 +1314,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		return overlap(_aabb, plane);
@@ -1366,10 +1366,10 @@ namespace bx
 		const Vec3 by = toYAxis(_srtB.rotation);
 		const Vec3 bz = toZAxis(_srtB.rotation);
 
-		Vec3 vertsA[8] = { init::None, init::None, init::None, init::None, init::None, init::None, init::None, init::None };
-		calcObbVertices(vertsA, ax, ay, az, init::Zero, _srtA.scale);
+		Vec3 vertsA[8] = { InitNone, InitNone, InitNone, InitNone, InitNone, InitNone, InitNone, InitNone };
+		calcObbVertices(vertsA, ax, ay, az, InitZero, _srtA.scale);
 
-		Vec3 vertsB[8] = { init::None, init::None, init::None, init::None, init::None, init::None, init::None, init::None };
+		Vec3 vertsB[8] = { InitNone, InitNone, InitNone, InitNone, InitNone, InitNone, InitNone, InitNone };
 		calcObbVertices(vertsB, bx, by, bz, sub(_srtB.translation, _srtA.translation), _srtB.scale);
 
 		return overlaps(ax,            vertsA, vertsB)
@@ -1543,7 +1543,7 @@ namespace bx
 
 	bool overlap(const Disk& _disk, const Vec3& _pos)
 	{
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		if (!isNearZero(distance(plane, _pos) ) )
@@ -1556,7 +1556,7 @@ namespace bx
 
 	bool overlap(const Disk& _disk, const Plane& _plane)
 	{
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		if (!overlap(plane, _plane) )
@@ -1574,7 +1574,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		return overlap(_capsule, plane);
@@ -1582,10 +1582,10 @@ namespace bx
 
 	bool overlap(const Disk& _diskA, const Disk& _diskB)
 	{
-		Plane planeA(init::None);
+		Plane planeA(InitNone);
 		calcPlane(planeA, _diskA.normal, _diskA.center);
 
-		Plane planeB(init::None);
+		Plane planeB(InitNone);
 		calcPlane(planeB, _diskB);
 
 		Line line;
@@ -1614,7 +1614,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		return overlap(_obb, plane);
@@ -1744,7 +1744,7 @@ namespace bx
 
 	bool overlap(const Sphere& _sphere, const Triangle& _triangle)
 	{
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _triangle);
 
 		if (!overlap(_sphere, plane) )
@@ -1782,7 +1782,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		return overlap(_sphere, plane);
@@ -1852,7 +1852,7 @@ namespace bx
 	template<typename Ty>
 	bool overlap(const Triangle& _triangle, const Ty& _ty)
 	{
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _triangle);
 
 		plane.normal = neg(plane.normal);
@@ -2011,7 +2011,7 @@ namespace bx
 			return false;
 		}
 
-		Plane plane(init::None);
+		Plane plane(InitNone);
 		calcPlane(plane, _disk.normal, _disk.center);
 
 		return overlap(_triangle, plane);
diff --git a/tests/math_test.cpp b/tests/math_test.cpp
index c0926c6..ed18551 100644
--- a/tests/math_test.cpp
+++ b/tests/math_test.cpp
@@ -346,11 +346,11 @@ TEST_CASE("quaternion", "")
 	float mtxQ[16];
 	float mtx[16];
 
-	bx::Quaternion quat = bx::init::Identity;
-	bx::Quaternion q2 = bx::init::None;
+	bx::Quaternion quat = bx::InitIdentity;
+	bx::Quaternion q2 = bx::InitNone;
 
-	bx::Vec3 axis = bx::init::None;
-	bx::Vec3 euler = bx::init::None;
+	bx::Vec3 axis = bx::InitNone;
+	bx::Vec3 euler = bx::InitNone;
 	float angle;
 
 	bx::mtxFromQuaternion(mtxQ, quat);