ChangeTag for vec and construct from std::array

cpp/src/math.hpp

@@ -44,6 +44,8 @@ public:
     requires(std::same_as<ArgsT, T> && ...) && (sizeof...(ArgsT) == N)
   vec(ArgsT... args) : m_Array{args...} {}
 
+  vec(std::array<T, N> array) : m_Array{array} {}
+
   //
   // Access to elements & data
   //
@@ -257,6 +259,12 @@ public:
     return m_Array[2];
   }
 
+  template <typename TargetTag>
+  vec<T,N,TargetTag> ChangeTag()
+  {
+    return vec<T,N,TargetTag>(m_Array);
+  }
+
 private:
   std::array<T, N> m_Array;
 };