1 files changed, 52 insertions, 0 deletions
diff --git a/libmhello/libmhello/hello.mxx b/libmhello/libmhello/hello.mxx
new file mode 100644
index 0000000..c9ed8e1
--- /dev/null
+++ b/libmhello/libmhello/hello.mxx
@@ -0,0 +1,52 @@
+// file: libmhello/hello.mxx -*- C++ -*-
+
+export module hello;
+
+import std.core;
+
+#ifndef __clang__
+export
+#endif
+import format;
+
+export namespace hello
+{
+  // If you compare this interface to version 1.0, then you will notice that
+  // while it is API/source-compatible (the call via the old signature of
+  // say() is still valid) it is not ABI/binary-compatible (say() now has an
+  // extra argument and is inline).
+  //
+  // Notice also that inline say() now uses a type and calls a function from
+  // format which means libmformat is an "interface dependency" of libmhello.
+  //
+  // Note that for the default argument (and thus source-compatibility) to
+  // work as expected we have to re-export the format module. Failed that,
+  // users of our API that don't care about the volume will still have to
+  // explicitly import format which would be a strange requirement indeed.
+
+  __symexport void
+  say_formatted (const std::string& message);
+
+#ifndef _MSC_VER
+  inline void
+  say (const std::string& name, format::volume v = format::volume::normal)
+  {
+    say_formatted (format::message ("Hello", name, v));
+  }
+#else
+  // - modulewriter.cpp:4730: sorry: not yet implemented
+  // - also, now need to symexport inline functions for some reason
+
+  __symexport inline void
+  say (const std::string& name)
+  {
+    say_formatted (format::message ("Hello", name, format::volume::normal));
+  }
+
+  __symexport inline void
+  say (const std::string& name, format::volume v)
+  {
+    say_formatted (format::message ("Hello", name, v));
+  }
+#endif
+}