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## vptr_map
### Synopsis
```c++
namespace boost::openmethod::policies {
### Synopsis
template<class Policy, class MapAdaptor = mp11::mp_quote<std::unordered_map>>
class vptr_map : public extern_vptr {
public:
template<typename ForwardIterator>
static auto register_vptrs(ForwardIterator first, ForwardIterator last) -> void;
template<class Class>
static auto dynamic_vptr(const Class& arg) -> const vptr_type&;
};
}
```
### Description
`vptr_map` is an implementation of `external_vptr that stores the pointers to
the v-tables in a map. If `Policy` contains `indirect_vptr`, a level of
indirection is added, making the policy usable in presence of dynamic loading.
`Policy` is the policy containing the policy.
`MapAdaptor` is a Boost.Mp11 quoted metafunction that returns a map type.
### Members
#### register_vptrs
```c++
template<typename ForwardIterator>
auto register_vptrs(ForwardIterator first, ForwardIterator last) -> void;
```
Stores the pointers to v-tables in a _Map_.
#### dynamic_vptr
```c++
template<class Class>
auto dynamic_vptr(const Class& object) -> const vptr_type&;
```
Returns a pointer to the v-table for `object` (by reference).
If _Policy_ contains the `runtime_checks` policy, checks if _Class_ is
registered. If it is not, and _Policy_ contains a `error_handler` policy, calls
its `error` function; then calls `abort`.
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