Can't use enum class as unordered_map key

Question

I have a class containing an enum class.

class Shader {
public:
    enum class Type {
        Vertex   = GL_VERTEX_SHADER,
        Geometry = GL_GEOMETRY_SHA         


        

Answer 1

Add this to header defining MyEnumClass:

namespace std {
  template <> struct hash {
    size_t operator() (const MyEnumClass &t) const { return size_t(t); }
  };
}