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#include <array>
#include <functional>
 
 
/// vector.h
template <typename NumType, unsigned char Size>
class Vector
{
public:
  using CoordType = NumType;
 
  //Vector(const Vector& v) : values(v.values) {}
  //Vector(Vector&& v) : values(std::move(v.values)) {}
 
  template<typename... NumTypes>
  constexpr Vector(NumTypes&&... vals) : values{ std::forward<NumTypes>(vals)... }
  {
    static_assert(sizeof...(NumTypes) == Size, "You must provide N arguments.");
  }
 
  Vector(const std::array<NumType, Size>& values) : values(values) {}
  Vector(std::array<NumType, Size>&& values) : values(std::move(values)) {}
 
  const NumType& operator[](size_t offset) const { return values[offset]; }
  NumType& operator[](size_t offset) { return values[offset]; }
  //Vector& operator=(const Vector& other) { values = other.values; }
  //Vector& operator=(Vector&& other) { values = std::move(other.values); }
 
  std::array<NumType, Size> values;
 
};
/// END vector.h
 
using Vector3Int = Vector<int, 3>;
int main() {
	Vector3Int test {1,2,3};
	Vector3Int test2 = test;
 
	return 0;
}

prog.cpp: In instantiation of ‘constexpr Vector<NumType, Size>::Vector(NumTypes&& ...) [with NumTypes = {Vector<int, 3>&}; NumType = int; unsigned char Size = 3]’:
prog.cpp:38:21:   required from here
prog.cpp:17:82: error: cannot convert ‘Vector<int, 3>’ to ‘int’ in initialization
   constexpr Vector(NumTypes&&... vals) : values{ std::forward<NumTypes>(vals)... }
                                                                                  ^
prog.cpp:19:39: error: static assertion failed: You must provide N arguments.
     static_assert(sizeof...(NumTypes) == Size, "You must provide N arguments.");
                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~

Standard output is empty