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63 lines
1.4 KiB
Plaintext
63 lines
1.4 KiB
Plaintext
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## vptr_map
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### Synopsis
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```c++
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namespace boost::openmethod::policies {
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### Synopsis
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template<
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class Policy, bool IndirectVptr,
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class Map = std::unordered_map<
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type_id,
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std::conditional_t<IndirectVptr, const vptr_type*, vptr_type>>>
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class vptr_map : extern_vptr {
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static Map vptrs;
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template<typename ForwardIterator>
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static auto register_vptrs(ForwardIterator first, ForwardIterator last) -> void;
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template<class Class>
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static auto dynamic_vptr(const Class& arg) -> const vptr_type&;
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};
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}
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```
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### Description
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`vptr_map` is an implementation of `external_vptr that stores the pointers to
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the v-tables in a map.
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`Policy` is the policy containing the facet.
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`Map` is an `AssociativeContainer`. The `mapped_type` is a pointer to a
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`vptr_type` if `UseIndirectVptrs` is `void`, or a pointer to a `vptr_type` if
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`UseIndirectVptrs` is `indirect_vptr`.
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### Members
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#### register_vptrs
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```c++
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template<typename ForwardIterator>
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auto register_vptrs(ForwardIterator first, ForwardIterator last) -> void;
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```
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Stores the pointers to v-tables in a _Map_.
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#### dynamic_vptr
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```c++
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template<class Class>
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auto dynamic_vptr(const Class& object) -> const vptr_type&;
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```
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Returns a pointer to the v-table for `object` (by reference).
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If _Policy_ contains the `runtime_checks` facet, checks if _Class_ is
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registered. If it is not, and _Policy_ contains a `error_handler` facet, calls
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its `error` function; then calls `abort`.
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