Coliru

• Test empty index_sequence
  • Simplified

• Variant with hierarchy and partial overloading
• Access enum as constant expression
• Test constexpr with template functor
• Change variable in parameter pack expansion
• Pitfalls of bitset::operator
• non_negative
• one_of, C++14
• Optional automatic determination of template parameter
• Non-const constexpr member function
• make_switch
• constexpr: Use tag dispatching for runtime/compile-time path