Visual C++ language extensions use "generic" as a keyword. Add a

workaround that renames the namespace to "cpp_generic" when those
language extensions are in effect.

Author: chriskohlhoff

asio/include/asio/detail/pop_options.hpp

@@ -95,4 +95,11 @@
 # pragma warning (pop)
 # pragma pack (pop)
 
+# if defined(__cplusplus_cli) || defined(__cplusplus_winrt)
+#  if defined(ASIO_CLR_WORKAROUND)
+#   undef generic
+#   undef ASIO_CLR_WORKAROUND
+#  endif
+# endif
+
 #endif

asio/include/asio/detail/push_options.hpp

@@ -124,4 +124,13 @@
 #  error Multithreaded RTL must be selected.
 # endif // !defined(_MT)
 
+# if defined(__cplusplus_cli) || defined(__cplusplus_winrt)
+#  if !defined(ASIO_DISABLE_CLR_WORKAROUND)
+#   if !defined(generic)
+#    define generic cpp_generic
+#    define ASIO_CLR_WORKAROUND
+#   endif
+#  endif
+# endif
+
 #endif