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[#method_override]
## method::override
### Synopsis
```c++
namespace boost::openmethod {
template<typename Signature, typename ReturnType, class Policy>
template<auto... Functions>
struct method<Signature, ReturnType, Policy>::override {
override();
~override();
};
}
```
Usage:
```c++
method<Signature, ReturnType, Policy>::override<Functions...> some_unique_name;
// at file scope
```
### Description
`override`, instantiated as a static object, add one or more overriders to an
open-method.
_Functions_ must fulfill the following requirements:
* Have the same number of formal parameters as the method.
* Each parameter in the same position as a `virtual_ptr<T>` in the method's
parameter list must be a `virtual_ptr<U>`, where _U_ is covariant with _T_. The
_Policy_ of the `virtual_ptr`{empty}s must be the same as the method's _Policy_.
* Each formal parameter in the same position as a `virtual_` parameter must have
a type that is covariant with the type of the method's parameter.
* All other formal parameters must have the same type as the method's
corresponding parameters.
* The return type of the overrider must be the same as the method's return type
or, if it is a polymorphic type, covariant with the method's return type.
### Members
#### constructor
```c++
override<Functions>::override();
```
Add _Functions_ to the overriders of `method`.
#### Destructor
```c++
override<Functions>::~method();
```
Remove _Functions_ from the overriders of `method`.
|
