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/*
flext tutorial - advanced 3
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 a port of Iohannes Zmölnigs "counter" example to the flext paradigm.
Find the original at http://iem.kug.ac.at/pd/externals-HOWTO/node5.html
The functionality is exactly the same, with one exception:
flext doesn't support default arguments, hence a message "bound 1" will translate into
"bound 1 0" in the original example, but won't be recognized with flext.
This can be easily circumvented by using a method digesting a variable argument list, but
was omitted for the sake of clearness.
Apart from that you'll notice several differences to the original C object:
- with flext, callbacks have to be declared for all registered methods
- Flext allows the full usage of integer types
- there are no real "passive" methods with flext.
These can be emulated by methods, or more flexibly, attributes (see example "attr3")
- Help symbols can't be defined that freely. This is because in Max/MSP help files always
have the name of the object with a suffix .help appended.
However with flext, a path to the respective help file may be specified
*/
// include flext header
#include <flext.h>
// check for appropriate flext version
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
#error You need at least flext version 0.4.1
#endif
class adv3:
public flext_base
{
FLEXT_HEADER_S(adv3,flext_base,setup)
public:
// constructor with no arguments
adv3(int argc,t_atom *argv):
i_step(1)
{
// --- initialize bounds and step size ---
int f1 = 0,f2 = 0;
switch(argc) {
default:
case 3:
i_step = GetInt(argv[2]);
case 2:
f2 = GetInt(argv[1]);
case 1:
f1 = GetInt(argv[0]);
case 0:
;
}
if(argc < 2) f2 = f1;
m_bound(f1,f2);
i_count = i_down;
// --- define inlets and outlets ---
AddInAnything("bang, reset, etc."); // default inlet
AddInList("bounds (2 element list)"); // inlet for bounds
AddInInt("step size"); // inlet for step size
AddOutInt("counter"); // outlet for integer count
AddOutBang("overflow bang"); // outlet for bang
}
protected:
void m_reset()
{
i_count = i_down;
}
void m_set(int argc,t_atom *argv)
{
i_count = argc?GetAInt(argv[0]):0;
}
void m_bang()
{
int f = i_count;
i_count += i_step;
if(i_down != i_up) {
if((i_step > 0) && (i_count > i_up)) {
i_count = i_down;
ToOutBang(1);
}
else if(i_count < i_down) {
i_count = i_up;
ToOutBang(1);
}
}
ToOutInt(0,f);
}
void m_bound(int f1,int f2)
{
i_down = f1 < f2?f1:f2;
i_up = f1 > f2?f1:f2;
}
void m_step(int s)
{
i_step = s;
}
int i_count,i_down,i_up,i_step;
private:
static void setup(t_classid c)
{
// --- set up methods (class scope) ---
// register a bang method to the default inlet (0)
FLEXT_CADDBANG(c,0,m_bang);
// set up tagged methods for the default inlet (0)
// the underscore _ after CADDMETHOD indicates that a message tag is used
// no, variable list or anything and all single arguments are recognized automatically, ...
FLEXT_CADDMETHOD_(c,0,"reset",m_reset);
FLEXT_CADDMETHOD_(c,0,"set",m_set);
// ..., more complex types (combinations of types) have to be specified explicitly
FLEXT_CADDMETHOD_II(c,0,"bound",m_bound); // two int arguments
// set up methods for inlets 1 and 2
// no message tag used
FLEXT_CADDMETHOD(c,1,m_bound); // variable arg type recognized automatically
FLEXT_CADDMETHOD(c,2,m_step); // single int arg also recognized automatically
}
// for every registered method a callback has to be declared
FLEXT_CALLBACK(m_bang)
FLEXT_CALLBACK(m_reset)
FLEXT_CALLBACK_V(m_set)
FLEXT_CALLBACK_II(m_bound)
FLEXT_CALLBACK_I(m_step)
};
// instantiate the class (constructor has a variable argument list)
// let "counter" be an alternative name
// before the colon define the name of the path to the help file
FLEXT_NEW_V("help, adv3 counter",adv3)
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