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std::hive<T,Allocator>::get_iterator - cppreference.com

From cppreference.com

iterator get_iterator( const_pointer p ) noexcept;
(1) (since C++26) 
const_iterator get_iterator( const_pointer p ) const noexcept;
(2) (since C++26)

1) returns an iterator pointing to the same element as p.

2) returns a const_iterator pointing to the same element as p.

If p does not point to an element in *this, the behavior is undefined.

Parameters

p - a pointer to the element

Return value

An iterator pointing to the same element as p.

Complexity

Linear in the number of active blocks in *this.

Example

#include <cassert>
#include <hive>
#include <iostream>

struct Bee { int id{}; };

int main()
{
    std::hive<Bee> bees;

    // populate the hive
    for (int id{}; id != 14; ++id)
        bees.emplace(++id);

    // get the address of the last element
    Bee* bee = &*--bees.end();
    std::cout << "bee->id = " << bee->id << '\n';

    // remove all elements with even id
    std::erase_if(bees, [](const Bee& bee) { return (bee.id % 2) == 0; });

    auto iter = bees.get_iterator(bee);
    assert(iter == --bees.end());
    std::cout << "iter->id = " << iter->id << '\n';
}

Output: 

bee->id = 13
iter->id = 13

See also

returns an iterator to the beginning
(public member function) [edit]
returns an iterator to the end
(public member function) [edit]
returns a reverse iterator to the beginning
(public member function) [edit]
returns a reverse iterator to the end
(public member function) [edit]