Macro BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST

BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST — Macro used to make a class compatible with boost::typeindex::runtime_cast without including support for boost::typeindex::type_id_runtime.

Synopsis

// In header: <boost/type_index/runtime_cast/register_runtime_class.hpp>

BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST(base_class_seq)

Description

BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST is provided as an alternative to BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS in the event that support for boost::typeindex::type_id_runtime is undesirable.

Example:

struct base1 {
    BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST(BOOST_TYPE_INDEX_NO_BASE_CLASS)
    virtual ~base1();
};

struct base2 {
    BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST(BOOST_TYPE_INDEX_NO_BASE_CLASS)
    virtual ~base2();
};

struct derived1 : base1 {
    BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST((base1))
};

struct derived2 : base1, base2 {
    BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST((base1)(base2))
};

...

base1* pb1 = get_object();
if(derived2* pb2 = boost::typeindex::runtime_cast<derived2*>(pb1))
{ /* can't call boost::typeindex::type_id_runtime(*pb1) here */ }

Parameters:

base_class_seq

A Boost.Preprocessor sequence of the current class' direct bases, or BOOST_TYPE_INDEX_NO_BASE_CLASS if this class has no direct base classes.

Boost C++ Libraries