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## Macro BOOST_INTRUSIVE_OPTION_CONSTANT

BOOST_INTRUSIVE_OPTION_CONSTANT

## Synopsis

    // In header: <boost/intrusive/pack_options.hpp>

    BOOST_INTRUSIVE_OPTION_CONSTANT(OPTION_NAME, TYPE, VALUE, CONSTANT_NAME)

## Description

Defines an option class of name OPTION_NAME that can be used to specify a constant of type TYPE with value VALUE...

    struct OPTION_NAME<TYPE VALUE>
    { /*unspecified_content*/ };

...that after being combined with `boost::intrusive::pack_options`, will contain a CONSTANT_NAME static constant of value VALUE. Example:

    //[includes and namespaces omitted for brevity]

    //This macro will create the following class:
    //    template<bool Enabled>
    //    struct incremental
    //    { unspecified_content };
    BOOST_INTRUSIVE_OPTION_CONSTANT(incremental, bool, Enabled, is_incremental)

    struct empty_default{};

    const bool is_incremental = pack_options< empty_default, incremental<true> >::type::is_incremental;

    BOOST_STATIC_ASSERT(( is_incremental == true ));