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/*
flext tutorial - library 1
Copyright (c) 2002,2003 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)
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