Added macros for fancy C++ casts.

base/src/nscore.h

@@ -136,4 +136,22 @@ typedef PRUcs2 PRUnichar;
 #define NS_PLUGIN NS_IMPORT
 #endif
 
+/* ------------------------------------------------------------------------ */
+// Casting macros for hiding C++ features from older compilers
+#if defined(HAS_C_PLUS_PLUS_CASTS)
+#define NS_STATIC_CAST(__type, __ptr)      static_cast<__type>(__ptr)
+#define NS_CONST_CAST(__type, __ptr)       const_cast<__type>(__ptr)
+#define NS_REINTERPRET_CAST(__type, __ptr) reinterpret_cast<__type>(__ptr)
+#else
+#define NS_STATIC_CAST(__type, __ptr)      ((__type)(__ptr))
+#define NS_CONST_CAST(__type, __ptr)       ((__type)(__ptr))
+#define NS_REINTERPRET_CAST(__type, __ptr) ((__type)(__ptr))
+#endif
+
+#if defined(HAS_C_PLUS_PLUS_CASTS) && defined(HAS_RTTI)
+#define NS_DYNAMIC_CAST(__type, __ptr) dynamic_cast<__type>(__ptr)
+#else
+#define NS_DYNAMIC_CAST(__type, __ptr) ((__type)(__ptr))
+#endif
+
 #endif /* nscore_h___ */