X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8fde61ed10b121a1e9dc0a31e2ce8562c4066a09..d9cf726bf3c92393d6b8628ce4fcd0805e8ad16e:/include/wx/defs.h

diff --git a/include/wx/defs.h b/include/wx/defs.h
index 537a7f5ad9..dbd1be4c13 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -210,7 +210,7 @@ typedef short int WXTYPE;
 // window id is unsigned, so we must always do the cast before comparing them
 // (or else they would be always different!). Usign wxGetWindowId() which does
 // the cast itself is recommended. Note that this type can't be unsigned
-// because -1 is a valid (and largely used) value for window id.
+// because wxID_ANY == -1 is a valid (and largely used) value for window id.
 typedef int wxWindowID;
 
 // ----------------------------------------------------------------------------
@@ -229,6 +229,23 @@ typedef int wxWindowID;
     #define wxUSE_NESTED_CLASSES    0
 #endif
 
+// check for explicit keyword support
+#ifndef HAVE_EXPLICIT
+    // VC++ 6.0 has explicit (what about the earlier versions?)
+    #if defined(__VISUALC__) && (__VISUALC__ > 1200)
+        #define HAVE_EXPLICIT
+    // Metrowerks CW6 or higher has explicit
+    #elif defined(__MWERKS__) && (__MWERKS__ >= 0x2400)
+        #define HAVE_EXPLICIT
+    #endif
+#endif // !HAVE_EXPLICIT
+
+#ifdef HAVE_EXPLICIT
+    #define wxEXPLICIT explicit
+#else // !HAVE_EXPLICIT
+    #define wxEXPLICIT
+#endif // HAVE_EXPLICIT/!HAVE_EXPLICIT
+
 // ----------------------------------------------------------------------------
 // portable calling conventions macros
 // ----------------------------------------------------------------------------