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+/* 
+flext tutorial - library 1 
+
+Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
+For information on usage and redistribution, and for a DISCLAIMER OF ALL
+WARRANTIES, see the file, "license.txt," in this distribution.  
+
+-------------------------------------------------------------------------
+
+This is an example of an external library containing a few simple objects
+
+It uses attributes, so be sure that you've already worked through attr1 and attr2
+
+*/
+
+// Enable attribute processing 
+// For clarity, this is done here, but you'd better specify it as a compiler definition
+#define FLEXT_ATTRIBUTES 1
+
+// include flext header
+#include <flext.h>
+
+// check for appropriate flext version
+#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 400)
+#error You need at least flext version 0.4.0
+#endif
+
+
+// -------------------------------------------------------------------------------------
+// Define the base class 
+// Note that you don't have to instantiate the base class (with FLEXT_NEW or variants)
+
+class libbase:
+	// inherit from basic flext class
+	public flext_base
+{
+	// obligatory flext header (class name,base class name)
+	FLEXT_HEADER(libbase,flext_base)
+ 
+public:
+	// constructor
+	libbase();
+
+protected:
+	void Output(float f) const { ToOutFloat(0,f); }
+
+	// method for floats into left inlet
+	virtual void m_trigger(float f) = 0;  
+
+	float arg;  // argument variable
+private:
+	FLEXT_CALLBACK_F(m_trigger);  // callback for method "m_trigger" (with one float argument)
+	FLEXT_ATTRVAR_F(arg);
+};
+
+libbase::libbase():
+	arg(0)  // initialize argument
+{ 
+	// define inlets:
+	// first inlet must always by of type anything (or signal for dsp objects)
+	AddInAnything();  // add one inlet for any message
+	
+	// define outlets:
+	AddOutFloat();  // add one float outlet (has index 0)
+	
+	// register methods
+	FLEXT_ADDMETHOD(0,m_trigger);  // register method (for float messages) "m_float" for inlet 0
+
+	// register attributes
+	FLEXT_ADDATTR_VAR1("arg",arg);  // register attribute "arg"
+} 
+
+
+// ------------------------------------------------------------------
+// Define the actual library objects (derived from the base class)
+// These classes have an implementation of the virtual function m_trigger 
+
+class libadd:
+	public libbase
+{
+	// obligatory flext header, inherit from libbase
+	FLEXT_HEADER(libadd,libbase)
+public:
+	virtual void m_trigger(float f) { Output(f+arg); }
+};
+
+FLEXT_LIB("lib1.+",libadd);
+
+
+
+class libsub:
+	public libbase
+{
+	// obligatory flext header, inherit from libbase
+	FLEXT_HEADER(libsub,libbase)
+public:
+	virtual void m_trigger(float f) { Output(f-arg); }
+};
+
+FLEXT_LIB("lib1.-",libsub);
+
+
+
+class libmul:
+	public libbase
+{
+	// obligatory flext header, inherit from libbase
+	FLEXT_HEADER(libmul,libbase)
+public:
+	virtual void m_trigger(float f) { Output(f*arg); }
+};
+
+FLEXT_LIB("lib1.*",libmul);
+
+
+// ------------------------------------------------
+// Do the library setup
+
+static void lib_setup()
+{
+	post("flext tutorial lib1, (C)2002 Thomas Grill");
+	post("lib1: lib1.+ lib1.- lib1.*");
+	post("");
+
+	// call the objects' setup routines
+	FLEXT_SETUP(libadd);
+	FLEXT_SETUP(libsub);
+	FLEXT_SETUP(libmul);
+}
+
+// setup the library
+FLEXT_LIB_SETUP(lib1,lib_setup)