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- [#metaprogramming_value]
- [section Template metaprogramming value]
- A ['template metaprogramming value] is a
- [link nullary_metafunction nullary template metafunction] returning itself.
- For example:
- struct void_
- {
- using type = void_;
- };
- This template metaprogramming value is called `void_`. It is a nullary
- metafunction returning itself as its result. Because of this, it can be treated
- as a nullary metafunction and evaluated any number of times. For example
- `void_::type::type::type` is still `void_`.
- [endsect]
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