libmhello/libmhello/hello.mxx


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// 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
}