Added an option to support experimental optional

cbeiraod · cbeiraod · commit 4981e55bf1b4 · 2017-10-17T13:08:30.000+01:00
diff --git a/hdr/sqlite_modern_cpp.h b/hdr/sqlite_modern_cpp.h
@@ -27,6 +27,8 @@
 
 #ifdef MODERN_SQLITE_STD_OPTIONAL_SUPPORT
 #include <optional>
+#elif _MODERN_SQLITE_EXPERIMENTAL_OPTIONAL_SUPPORT && __has_include(<experimental/optional>)
+#include <experimental/optional>
 #endif
 
 #ifdef _MODERN_SQLITE_BOOST_OPTIONAL_SUPPORT
