boost::openmethod::virtual_ptr<SmartPtr, Registry>::operator= :: Boost.OpenMethod

# boost::openmethod::virtual_ptr<SmartPtr, Registry>::operator=

Assign from a (const) smart pointer to a derived class

## Synopsis

Declared in `<boost/openmethod/core.hpp>`

    template<class Other>
    requires SameSmartPtr<SmartPtr, Other, Registry> &&
                std::is_assignable_v<SmartPtr, const Other&> &&
                BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
                    IsPolymorphic<typename Other::element_type, Registry>
    virtual_ptr&
    operator=(Other const& other);

## Description

Copy the object pointer from `other` to `this`. Set the v‐table pointer according to the dynamic type of `*other`.

## Example

    virtual_ptr<std::shared_ptr<Dog>> snoopy = make_shared_virtual<Dog>();
    virtual_ptr<std::shared_ptr<Dog>> p;

    p = snoopy;

    BOOST_TEST(p.get() != nullptr);
    BOOST_TEST(p.get() == snoopy.get());
    BOOST_TEST(p.vptr() == default_registry::static_vptr<Dog>);
    BOOST_TEST(snoopy.vptr() == default_registry::static_vptr<Dog>);

## Requirements

- `SmartPtr` and `Other` must be instantiated from the same template ‐ e.g. both `std::shared_ptr` or both `std::unique_ptr`.

- `Other` must be a smart pointer to a polymorphic class derived from `element_type`.

- `SmartPtr` must be constructible from `const Other&`.

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