zhipuzi_pos_windows/include/boost/openmethod/policies/static_rtti.hpp

// Copyright (c) 2018-2025 Jean-Louis Leroy
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_OPENMETHOD_POLICY_MINIMAL_RTTI_HPP
#define BOOST_OPENMETHOD_POLICY_MINIMAL_RTTI_HPP

#include <boost/openmethod/preamble.hpp>

namespace boost::openmethod::policies {

//! Minimal implementation of the `rtti` policy.
//!
//! `static_rtti` implements only the static parts of the `rtti` policy. It uses
//! the addresses of a per-class static variables as a `type_id`. It categorizes
//! all types as non-polymorphic. As a consequence, the `virtual_ptr`
//! constructors that take a pointer or a reference to a polymorphic object are
//! disabled. `virtual_ptr` must be constructed using @ref final_virtual_ptr (or
//! its equivalents for smart pointers).
//!
//! @par Example
//! TODO
//! include::example$static_rtti.cpp[tag=all]
struct static_rtti : rtti {
    //! A RttiFn metafunction.
    //!
    //! @tparam Registry The registry containing this policy.
    template<class Registry>
    struct fn : rtti::defaults {
        //! Always evaluates to `false`.
        //! @tparam Class A class.
        template<class Class>
        static constexpr bool is_polymorphic = false;

        //! Returns the @ref type_id of `Class`.
        //!
        //! @tparam Class A class.
        template<typename T>
        static auto static_type() -> type_id {
            static char id;
            return &id;
        }
    };
};

} // namespace boost::openmethod::policies

#endif