// Automatically generated C++ file on Wed Feb  4 16:36:39 2026
//
// To build with Digital Mars C++ Compiler:
//
//    dmc -mn -WD my_first_block.cpp kernel32.lib


union uData
{
   bool b;
   char c;
   unsigned char uc;
   short s;
   unsigned short us;
   int i;
   unsigned int ui;
   float f;
   double d;
   long long int i64;
   unsigned long long int ui64;
   char *str;
   unsigned char *bytes;
};

// int DllMain() must exist and return 1 for a process to load the .DLL
// See https://docs.microsoft.com/en-us/windows/win32/dlls/dllmain for more information.
int __stdcall DllMain(void *module, unsigned int reason, void *reserved) { return 1; }

// #undef pin names lest they collide with names in any header file(s) you might include.
#undef IN
#undef OUT
#undef CLK

static bool clk_state = false;
static double Z1 = 0.0;
static double Z2 = 0.0;
static double A0 = -0.5;
static double A1 = 0.9;

extern "C" __declspec(dllexport) void my_first_block(void **opaque, double t, union uData *data)
{
   double  IN  = data[0].d; // input
   bool    CLK = data[1].b; // input
   double &OUT = data[2].d; // output
   if (CLK == false || CLK != clk_state)
      goto end;
      //*----------------------------------*/
   OUT = IN - Z1 * A0 - Z2 * A1;
   Z2 = Z1;
   Z1 = OUT;
      //*----------------------------------*/
   end:
      clk_state = CLK;

// Implement module evaluation code here:

}