3 files changed, 91 insertions, 0 deletions
diff --git a/libmhello/libmhello/buildfile b/libmhello/libmhello/buildfile
new file mode 100644
index 0000000..5b46722
--- /dev/null
+++ b/libmhello/libmhello/buildfile
@@ -0,0 +1,19 @@
+import int_libs  = libmformat%lib{mformat}
+import imp_libs  = libmprint%lib{mprint}
+import imp_libs += libstd-modules%liba{std-modules}
+
+lib{mhello}: {mxx cxx}{hello} $imp_libs $int_libs
+
+# For pre-releases use the complete version to make sure they cannot be used
+# in place of another pre-release or the final version.
+#
+if $version.pre_release
+  lib{mhello}: bin.lib.version = @"-$version.project_id"
+else
+  lib{mhello}: bin.lib.version = @"-$version.major.$version.minor"
+
+lib{mhello}: cxx.export.libs = $int_libs
+
+# Install into the libmhello/ subdirectory of, say, /usr/include/.
+#
+install.include = $install.include/$project/
diff --git a/libmhello/libmhello/hello.cxx b/libmhello/libmhello/hello.cxx
new file mode 100644
index 0000000..c94f921
--- /dev/null
+++ b/libmhello/libmhello/hello.cxx
@@ -0,0 +1,20 @@
+// file: libmhello/hello.cxx -*- C++ -*-
+
+module hello;
+
+#ifdef __clang__
+import std.core;
+#endif
+
+import print;
+
+using namespace std;
+
+namespace hello
+{
+  void
+  say_formatted (const string& m)
+  {
+    print::to_stdout (m);
+  }
+}
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
+}