namespace placeholders
{
-#if defined(__BORLANDC__) || defined(__GNUC__) && (__GNUC__ < 4)
+#if defined(BOOST_BORLANDC) || defined(__GNUC__) && (__GNUC__ < 4)
inline boost::arg<1> _1() { return boost::arg<1>(); }
inline boost::arg<2> _2() { return boost::arg<2>(); }
inline boost::arg<8> _8() { return boost::arg<8>(); }
inline boost::arg<9> _9() { return boost::arg<9>(); }
+#elif !defined(BOOST_NO_CXX17_INLINE_VARIABLES)
+
+BOOST_INLINE_CONSTEXPR boost::arg<1> _1;
+BOOST_INLINE_CONSTEXPR boost::arg<2> _2;
+BOOST_INLINE_CONSTEXPR boost::arg<3> _3;
+BOOST_INLINE_CONSTEXPR boost::arg<4> _4;
+BOOST_INLINE_CONSTEXPR boost::arg<5> _5;
+BOOST_INLINE_CONSTEXPR boost::arg<6> _6;
+BOOST_INLINE_CONSTEXPR boost::arg<7> _7;
+BOOST_INLINE_CONSTEXPR boost::arg<8> _8;
+BOOST_INLINE_CONSTEXPR boost::arg<9> _9;
+
#else
BOOST_STATIC_CONSTEXPR boost::arg<1> _1;