3rdParty/boost/1.78.0/libs/preprocessor/doc/ref/counter.html
The BOOST_PP_COUNTER macro expands to the current counter value.
BOOST_PP_COUNTER
This macro expands to an integer literal. Its initial value is 0. Between usages of BOOST_PP_UPDATE_COUNTER , the value of BOOST_PP_COUNTER is constant.
Header: <boost/preprocessor/slot/counter.hpp>
#include <[boost/preprocessor/slot/counter.hpp](../headers/array/insert.html)>[BOOST\_PP\_COUNTER](counter.html)// 0
#include[BOOST\_PP\_UPDATE\_COUNTER](update_counter.html)()[BOOST\_PP\_COUNTER](counter.html)// 1
#include[BOOST\_PP\_UPDATE\_COUNTER](update_counter.html)()[BOOST\_PP\_COUNTER](counter.html)// 2
#include[BOOST\_PP\_UPDATE\_COUNTER](update_counter.html)()[BOOST\_PP\_COUNTER](counter.html)// 3
Copyright Housemarque Oy 2002 Copyright Paul Mensonides 2002
Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt)