very, very simple WP with midi CC out

include/libremidi/backends/coremidi/config.hpp

@@ -0,0 +1,41 @@
+#pragma once
+#include <libremidi/config.hpp>
+
+#include <cstdint>
+#include <functional>
+#include <optional>
+#include <string>
+
+#if defined(__APPLE__)
+  #if __LP64__
+typedef unsigned int UInt32;
+  #else
+typedef unsigned long UInt32;
+  #endif
+typedef UInt32 MIDIObjectRef;
+typedef MIDIObjectRef MIDIClientRef;
+#else
+using MIDIClientRef = uint32_t;
+#endif
+namespace libremidi
+{
+
+struct coremidi_input_configuration
+{
+  std::string client_name = "libremidi client";
+  std::optional<MIDIClientRef> context{};
+};
+
+struct coremidi_output_configuration
+{
+  std::string client_name = "libremidi client";
+  std::optional<MIDIClientRef> context{};
+};
+
+struct coremidi_observer_configuration
+{
+  std::string client_name = "libremidi client";
+  std::function<void(MIDIClientRef)> on_create_context{};
+};
+
+}