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## use_classes
### Synopsis
Defined in <boost/openmethod/core.hpp>.
```c++
namespace boost::openmethod {
template<class... Classes, class Policy = BOOST_OPENMETHOD_DEFAULT_REGISTRY>
struct use_classes {
use_classes();
~use_classes();
};
}
```
Usage:
```c++
use_classes<Classes...> some_unique_name; // at file scope
```
### Description
`use_classes`, instantiated as a static object, registers `Classes` in `Policy`.
Classes potentially involved in a method definition, an overrider, or a method
call must be registered via `use_classes`. A class may be registered multiple
times. A class and its direct bases must be listed together in one or more
instantiations of `use_classes`.
Virtual and multiple inheritance are supported, as long as they don't result in
a class lattice that contains repeated inheritance.
NOTE: The default value for `Policy` is the value of
`BOOST_OPENMETHOD_DEFAULT_REGISTRY` when `<boost/openmethod/core.hpp>` is
included. Subsequently changing it has no retroactive effect.
### Members
#### constructor
```c++
use_classes();
```
Registers `Classes` and their inheritance relationships in `Policy`.
#### destructor
```c++
~use_classes();
```
Removes `Classes` and their inheritance relationships from `Policy`.
|
