id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13372	"Boost Preprocessing: compiler error: macro ""BOOST_PP_VARIADIC_ELEM_2"" requires 4 arguments, but only 2 given"	Dmitrii B <d4qcdes@…>	No-Maintainer	"The following code produces the following compiler error when compiled with gcc 7.2.0 or clang 3.8.0
{{{
error: macro ""BOOST_PP_VARIADIC_ELEM_2"" requires 4 arguments, but only 2 given
}}}
{{{
#include <boost/preprocessor.hpp>

#define CREATE_ENUM_ELEMENT(elementTuple)												\
    BOOST_PP_IF(BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(elementTuple), 3),                   \
        BOOST_PP_TUPLE_ELEM(0, elementTuple) = BOOST_PP_TUPLE_ELEM(2, elementTuple),    \
        BOOST_PP_TUPLE_ELEM(0, elementTuple)                                            \
    ),

enum class MyEnum {
	CREATE_ENUM_ELEMENT((El1))
};

int main() {
	return 0;
}
}}}
(online demo: http://coliru.stacked-crooked.com/a/f01351ee7a0ca55d )

"	Bugs	new	To Be Determined	preprocessor	Boost 1.64.0	Problem