Pd-dev January 2005

pd-dev@lists.iem.at

18 participants
43 discussions

GEM and operator new
by Georg Holzmann 02 Jan '05

02 Jan '05

Hallo Gem-devs! I just made some things in GEM and noticed, that a lot of C++-style features are not possible, because in Base/cppExtern the operator new is defined as (correct me if I'm wrong): GEM_EXTERN void *operator new(size_t, void *location, void *dummy); (e.g. I tried to use fstreams and strings for fileIO and there was always the compiler error: ... /usr/include/c++/3.3/bits/basic_string.tcc:555: error: no matching function for call to `operator new(unsigned int, void*&)' <internal>:555: error: candidates are: void* operator new(unsigned int) ../Base/CPPExtern.h:132: error: void* operator new(unsigned int, void*, void*) ) so I also defined: //----------8<------Base/cppExtern.h--------8<------------ GEM_EXTERN void *operator new(size_t); GEM_EXTERN void *operator new[](size_t); GEM_EXTERN void *operator new(size_t, void *location); GEM_EXTERN void *operator new[](size_t, void *location); GEM_EXTERN void operator delete(void *base_ptr); GEM_EXTERN void operator delete[](void *base_ptr); //--------------->8----------------->8-------------------- //----------8<------Base/cppExtern.cpp--------8<---------- GEM_EXTERN void *operator new(size_t size) { return (::operator new( size )); } GEM_EXTERN void *operator new[](size_t size) { return (::operator new( size )); } GEM_EXTERN void *operator new(size_t size, void *location) { return (::operator new( size )); } GEM_EXTERN void *operator new[](size_t size, void *location) { return (::operator new( size )); } GEM_EXTERN void operator delete(void *base_ptr) { if(base_ptr) ::operator delete( base_ptr ); } GEM_EXTERN void operator delete[](void *base_ptr) { if(base_ptr) ::operator delete( base_ptr ); } //--------------->8----------------->8-------------------- So my question: Has this implementation any other disadvantages that I am not thinking of at the moment (e.g. performance, because I ignored the location pointer?) ? (I know I can also make all that stuff in C-style, but why?) LG Georg -- +++ GMX - die erste Adresse für Mail, Message, More +++ 1 GB Mailbox bereits in GMX FreeMail http://www.gmx.net/de/go/mail

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Variable number of control inlets in external
by Ian Smith-Heisters 02 Jan '05

02 Jan '05

Hi all, I'm trying to write a simple external in C. I read IOhannes' tutorial, and got simple framework running that had four inlets and outlets and the ability to send a bang to output the values of the inlets to their respective outlets. Next I want to be able to pass a single argument that will specify the number of inlets and outlets in addition to the first hot inlet. Below is the code I have, which certainly doesn't work. Summarily (is that a word?), I've just been trying to make n inlets and push the values of those inlets to the first outlet on a bang. I figure once I have that I can do the outlets pretty easily. The pertinent parts of the code are these: // Initialize dataspace typedef struct _genmut { t_object x_obj; t_float rating, num_inlets; t_float *nums_vec; t_outlet *f_out1, *f_out2, *f_out3, *f_out4; } t_genmut; //Methods void genmut_bang(t_genmut *x) { // just trying to get the right number of inlets first, then I'll work // on outlets. This should push the numbers from the inlets to the // first outlet. But it doesn't. for (i = 0; i < &x->i_numinlets; i++) outlet_float(x->f_out1, x->nums_vec[i]); } // Constructor void *genmut_new(t_floatarg ni) { t_genmut *x = (t_genmut *)pd_new(genmut_class); int i; x->num_inlets = ni; // set rating to default x->rating = 1; // dynamically create the inlets for (i = 0; i < ni; i++) floatinlet_new(&x->x_obj, &x->nums_vec[i]); x->f_out1 = outlet_new(&x->x_obj, &s_float); x->f_out2 = outlet_new(&x->x_obj, &s_float); x->f_out3 = outlet_new(&x->x_obj, &s_float); x->f_out4 = outlet_new(&x->x_obj, &s_float); return (void *)x; } My difficulty is only compounded by my obviously rudimentary and somewhat dusty C skills. I'm unclear on how to create the vector that would make a dynamically sizeable array for the inlets and outlets. Thanks for any advice. The whole of the code is below. -Ian /* genmut.c - Genetic Mutator external for Pure Data Take n floats, mutate them w/ a genetic algorithm, searching for a higher rating, which is given by the user via inlet 1. By Ian Smith-Heisters heisters [at] 0x09.com http://www.0x09.com History: Dec 28, '04: started */ #include "m_pd.h" static t_class *genmut_class; // Initialize dataspace typedef struct _genmut { t_object x_obj; t_float rating, num_inlets; t_float *nums_vec; t_outlet *f_out1, *f_out2, *f_out3, *f_out4; } t_genmut; //Methods void genmut_bang(t_genmut *x) { for (i = 0; i < &x->i_numinlets; i++) outlet_float(x->f_out1, x->nums_vec[i]); } void genmut_rating(t_genmut *x, t_floatarg f) { x->rating = f; } // Constructor void *genmut_new(t_floatarg ni) { t_genmut *x = (t_genmut *)pd_new(genmut_class); int i; x->num_inlets = ni; // set rating to default x->rating = 1; // dynamically create the inlets for (i = 0; i < ni; i++) floatinlet_new(&x->x_obj, &x->nums_vec[i]); /* floatinlet_new(&x->x_obj, &x->num1); floatinlet_new(&x->x_obj, &x->num2); floatinlet_new(&x->x_obj, &x->num3); floatinlet_new(&x->x_obj, &x->num4); */ x->f_out1 = outlet_new(&x->x_obj, &s_float); x->f_out2 = outlet_new(&x->x_obj, &s_float); x->f_out3 = outlet_new(&x->x_obj, &s_float); x->f_out4 = outlet_new(&x->x_obj, &s_float); return (void *)x; } // Setup void genmut_setup(void) { genmut_class = class_new(gensym("genmut"), (t_newmethod)genmut_new, 0, sizeof(t_genmut), CLASS_DEFAULT, 0); class_addbang (genmut_class, genmut_bang); class_addmethod(genmut_class, (t_method)genmut_rating, gensym("rating"), A_DEFFLOAT, 0); class_sethelpsymbol(genmut_class, gensym("help-genmut")); }

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bug in cvn code...
by Tim Blechmann 01 Jan '05

01 Jan '05

hi miller, hi list ... there is a bug in the cnv code: after sending an empty label to the canvas with |;mycanvas label( the cnv object gets corrupted: fix is attached ... cheers ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

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Pd-dev January 2005