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- [#boxed_value]
- [section Boxed value]
- A ['boxed value] is a type representing a constant value. It has a public static
- `const` or `constexpr` member called `value`. The class represents that value as
- a type, so it can be manipulated by [link metafunction template metafunction]s.
- It has to be a [link metaprogramming_value template metaprogramming value].
- For example the following `struct` represents the `true` value of type `bool`:
- struct true_type
- {
- static constexpr bool value = true;
- using type = true_type;
- };
- The `value` member is the wrapped value. `true_type::type` is an alias of
- `true_type` which makes it a template metaprogramming value.
- [endsect]
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