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60 lines
1.5 KiB
Plaintext
60 lines
1.5 KiB
Plaintext
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## vptr_vector
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### Synopsis
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Defined in <boost/openmethod/policies/vptr_vector.hpp>.
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```c++
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namespace boost::openmethod::policies {
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template<class Policy>
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class vptr_vector : Base {
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public:
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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_vector` is an implementation or `external_vptr` that keeps the pointers to
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the v-tables in a `std::vector`. If `Policy` contains `indirect_vptr`, a level
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of indirection is added, making the policy usable in presence of dynamic
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loading.
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`Policy` is the policy containing the policy.
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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 vector, indexed by the (possibly hashed)
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`type_id`s of the classes registered in `Policy`.
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If `Policy` contains a `type_hash` policy, call its `hash_initialize`
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function, and uses it to convert the `type_id`{empty}s to an index.
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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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Obtains a `type_id` for `object` using `Policy::dynamic_type`. If _Policy_
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contains a `type_hash` policy, uses it to convert the result to an index;
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otherwise, uses the `type_id` as the index.
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