static void mdlInitializeSizes(SimStruct *S)
{
    ssSetNumSFcnParams(S, 0);
    if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {
        return; /* Parameter mismatch will be reported by Simulink */
    }

    if (!ssSetNumInputPorts(S, 1)) return;
    ssSetInputPortWidth(S, 0, 1);
    ssSetInputPortDataType(S, 0, SS_DOUBLE);
    ssSetInputPortDirectFeedThrough(S, 0, 1);

    /* specify the sim state compliance to be same as a built-in block */
    //ssSetSimStateCompliance(S, HAS_NO_SIM_STATE);

    ssSetOptions(S,
                 SS_OPTION_DISALLOW_CONSTANT_SAMPLE_TIME |
                 SS_OPTION_WORKS_WITH_CODE_REUSE |
                 SS_OPTION_USE_TLC_WITH_ACCELERATOR);
}