fixes comp::zero errors

src/typed-geometry/detail/special_values.hh

 #pragma once
 
+#include <typed-geometry/types/comp.hh>
 #include <typed-geometry/types/dir.hh>
 #include <typed-geometry/types/mat.hh>
 #include <typed-geometry/types/pos.hh>
@@ -300,6 +301,15 @@ const size<4, ScalarT> size<4, ScalarT>::ones = {ScalarT(1), ScalarT(1), ScalarT
 template <class ScalarT>
 const size<4, ScalarT> size<4, ScalarT>::unit = {ScalarT(1), ScalarT(1), ScalarT(1), ScalarT(1)};
 
+template <class ScalarT>
+const comp<1, ScalarT> comp<1, ScalarT>::zero = {ScalarT(0)};
+template <class ScalarT>
+const comp<2, ScalarT> comp<2, ScalarT>::zero = {ScalarT(0), ScalarT(0)};
+template <class ScalarT>
+const comp<3, ScalarT> comp<3, ScalarT>::zero = {ScalarT(0), ScalarT(0), ScalarT(0)};
+template <class ScalarT>
+const comp<4, ScalarT> comp<4, ScalarT>::zero = {ScalarT(0), ScalarT(0), ScalarT(0), ScalarT(0)};
+
 template <int C, int R, class ScalarT>
 const mat<C, R, ScalarT> mat<C, R, ScalarT>::zero = {};
 template <int C, int R, class ScalarT>