Add helper macro BOOST_IF_CONSTEXPR.

2020-01-24 18:33:21 +00:00
parent 9d79e8111a
commit 9aaa4edda1
3 changed files with 20 additions and 0 deletions
@@ -1002,6 +1002,14 @@ namespace std{ using ::type_info; }
 #else
 #define BOOST_INLINE_VARIABLE
 #endif
+//
+// C++17 if constexpr
+//
+#if !defined(BOOST_NO_CXX17_IF_CONSTEXPR)
+#  define BOOST_IF_CONSTEXPR if constexpr
+#else
+#  define BOOST_IF_CONSTEXPR if
+#endif

 //
 // Unused variable/typedef workarounds: