rvalues and forwarding references

A&&, A const&, A& : https://coliru.stacked-crooked.com/a/b726a71f1dad0eb3

templates

• https://coliru.stacked-crooked.com/a/4847d6cdb6dd6bab template deduction guide, ensure all types of argument pack are the same and get the type
• https://coliru.stacked-crooked.com/a/edaffec28fb1d005 trick for alias template specialization and std::variant
• https://godbolt.org/z/tRWv8s nested std::apply for nested loops on tuples
• http://coliru.stacked-crooked.com/a/f203f45c01f025dd prototype for python Dict-like structure
• https://coliru.stacked-crooked.com/a/6a16d4b41c5c310e variadic inheritance and using
• https://coliru.stacked-crooked.com/a/fef3249e49640a61 is_homogeneous using variadic expression

std::variants

• https://coliru.stacked-crooked.com/a/edaffec28fb1d005 uses std::get on variants