void main_source(twoints * &data){data=(twoints *)calloc(100, sizeof(twoints));}void main(){twoints * data;data=NULL;main_source(data);delete data;}
static void main_source(twoints * &data){data=(twoints *)calloc(100, sizeof(twoints));}static void main(){twoints * data;data=NULL;main_source(data);free(data);}