File: virtual_.adoc

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## virtual_

### Synopsis

Defined in `<boost/openmethod/core.hpp>`.

```c++
namespace boost::openmethod {

template<typename T>
struct virtual_;

}
```

### Description

Marks a formal parameter of a method as virtual. Requires a specialization of
`virtual_traits` for `T` and the `Policy` of the method. Specializations for
`T&`, `T&&`, `T*`, `std::unique_ptr<T>`, `std::shared_ptr<T>` and `const
std::shared_ptr<T>&` are provided. See the documentation of `virtual_traits` for
more information.