Add C++ bindings

1 files changed, 81 insertions, 0 deletions

diff --git a/lv2/lv2plug.in/ns/lv2core/Lib.hpp b/lv2/lv2plug.in/ns/lv2core/Lib.hpp
new file mode 100644
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+++ b/lv2/lv2plug.in/ns/lv2core/Lib.hpp
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+/*
+  Copyright 2015 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef LV2_LIB_HPP
+#define LV2_LIB_HPP
+
+#include "lv2/lv2plug.in/ns/lv2core/Plugin.hpp"
+
+namespace lv2 {
+
+/**
+   C++ wrapper for an LV2 plugin library.
+
+   This interface is a convenience for plugin authors only, and is not an ABI
+   used by hosts.  Plugin authors should inherit from this interface, passing
+   their derived class as the template parameter, and provide an
+   lv2_lib_descriptor entry point in C:
+
+   @code
+   class MyLib : public lv2::Lib<MyLib> { ... };
+
+   LV2_SYMBOL_EXPORT static const LV2_Lib_Descriptor*
+   lv2_lib_descriptor(const char*                bundle_path,
+                      const LV2_Feature *const * features)
+   {
+       return new MyLib(bundle_path, features);
+   }
+   @endcode
+*/
+template<class Derived>
+class Lib : public LV2_Lib_Descriptor
+{
+public:
+	/**
+	   Library constructor.
+	*/
+	Lib(const char*              bundle_path,
+	    const LV2_Feature*const* features)
+	{
+		LV2_Lib_Descriptor::handle     = this;
+		LV2_Lib_Descriptor::size       = sizeof(LV2_Lib_Descriptor);
+		LV2_Lib_Descriptor::cleanup    = s_cleanup;
+		LV2_Lib_Descriptor::get_plugin = s_get_plugin;
+	}
+
+	/**
+	   Plugin accessor, override to return your plugin descriptors.
+
+	   Plugins are accessed by index using values from 0 upwards.  Out of range
+	   indices MUST result in this function returning NULL, so the host can
+	   enumerate plugins by increasing `index` until NULL is returned.
+	*/
+	const LV2_Descriptor* get_plugin(uint32_t index) { return NULL; }
+
+private:
+	static void s_cleanup(LV2_Lib_Handle handle) {
+		delete reinterpret_cast<Derived*>(handle);
+	}
+
+	static const LV2_Descriptor* s_get_plugin(LV2_Lib_Handle handle,
+	                                          uint32_t       index) {
+		return reinterpret_cast<Derived*>(handle)->get_plugin(index);
+	}
+};
+
+} /* namespace lv2 */
+
+#endif /* LV2_LIB_HPP */