id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6760	PUSH_BACK/_FRONT on empty array broken	yves.pausch@…	pmenso57	"BOOST_PP_ARRAY_PUSH_BACK & BOOST_PP_ARRAY_PUSH_FRONT on empty array leads to invalid C++ because of unresolved macro

Sample to reproduce this bug:

#define ARRAY (3, (a, b, c))
#define EMPTY_ARRAY (0, ())
BOOST_PP_ARRAY_PUSH_BACK(ARRAY, d)
BOOST_PP_ARRAY_PUSH_BACK(EMPTY_ARRAY, d)

brings '''using 1.48'''

(4, (a, b, c , d))
(1, ( d))

which is expected and correct

brings '''using 1.49'''

(4, (a, b, c , d))
(1, (BOOST_PP_TUPLE_REM_0 () d))
"	Bugs	closed	Boost 1.50.0	preprocessor	Boost 1.49.0	Problem	invalid