Math: no need to use class here.

src/Magnum/Math/Matrix.h

@@ -34,7 +34,7 @@
 namespace Magnum { namespace Math {
 
 namespace Implementation {
-    template<std::size_t size, class T> class MatrixDeterminant;
+    template<std::size_t, class> struct MatrixDeterminant;
 }
 
 /**
@@ -248,8 +248,7 @@ template<std::size_t size, class T> inline Corrade::Utility::Debug operator<<(Co
 
 namespace Implementation {
 
-template<std::size_t size, class T> class MatrixDeterminant {
+template<std::size_t size, class T> struct MatrixDeterminant {
-    public:
     T operator()(const Matrix<size, T>& m);
 };
 
@@ -262,15 +261,13 @@ template<std::size_t size, class T> T MatrixDeterminant<size, T>::operator()(con
     return out;
 }
 
-template<class T> class MatrixDeterminant<2, T> {
+template<class T> struct MatrixDeterminant<2, T> {
-    public:
     constexpr T operator()(const Matrix<2, T>& m) const {
         return m[0][0]*m[1][1] - m[1][0]*m[0][1];
     }
 };
 
-template<class T> class MatrixDeterminant<1, T> {
+template<class T> struct MatrixDeterminant<1, T> {
-    public:
     constexpr T operator()(const Matrix<1, T>& m) const {
         return m[0][0];
     }