[Boost-bugs] [Boost C++ Libraries] #13372: Boost Preprocessing: compiler error: macro "BOOST_PP_VARIADIC_ELEM_2" requires 4 arguments, but only 2 given

Subject: [Boost-bugs] [Boost C++ Libraries] #13372: Boost Preprocessing: compiler error: macro "BOOST_PP_VARIADIC_ELEM_2" requires 4 arguments, but only 2 given
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-01-01 19:30:49

#13372: Boost Preprocessing: compiler error: macro "BOOST_PP_VARIADIC_ELEM_2"
requires 4 arguments, but only 2 given
-----------------------------------+---------------------------
 Reporter:  Dmitrii B <d4qcdes@…>  |      Owner:  No-Maintainer
     Type:  Bugs                   |     Status:  new
Milestone:  To Be Determined       |  Component:  preprocessor
  Version:  Boost 1.64.0           |   Severity:  Problem
 Keywords:                         |
-----------------------------------+---------------------------
 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 )

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13372>
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